Serifos experiences a classic Mediterranean climate. This means you can expect long, hot summers and short, mild winters. The warmest period falls between July and August, when daytime temperatures regularly reach 28 degrees Celsius. January and February are the coolest months, with temperatures dropping to around 15 degrees Celsius during the day.
Typical summer conditions bring brilliant sunshine and virtually no rain. The rainfall pattern is highly seasonal, with most rain arriving between November and March. Summer months are exceptionally dry. The island also receives plenty of sunshine throughout the year, especially from May to September.
Wind is a significant factor here. The Meltemi, a strong northerly wind, frequently blows across the Aegean Sea during July and August. Knowing about these weather patterns matters greatly when planning your trip, as they influence everything from beach days to ferry schedules. The rest of this page includes general climate information and a live weather forecast to help you prepare.
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Serifos Weather at a Glance
Understanding the climate of Serifos helps you plan the perfect trip. The weather is hottest during July and August, making these months ideal for sunbathing. The coolest temperatures occur in January and February, when the island feels much quieter.
Rainfall is most likely from December to February. December usually records the highest amount of rain. If you want to avoid wet weather, the driest months are June, July and August, when rain is exceptionally rare. The island is also sunniest during this peak summer period, offering long days of clear skies.
Winds can be strongest in July and August due to the Meltemi. This northerly wind helps to cool down the summer heat. The general swimming season starts in late May and continues comfortably until October, as the sea retains its warmth from the summer months.
Serifos Weather by Month
January
January brings the coolest weather to Serifos. Daytime temperatures usually hover around 15 degrees Celsius, while nights drop closer to 12 degrees Celsius. This is a wet month, so expect occasional heavy rain showers and cloudy skies. Sunshine is limited, and the sea is far too cold for swimming. Strong winter winds can also cause ferry delays. The island is very quiet during January, as most tourist businesses close for the winter. This month suits travellers who want complete isolation and do not mind staying indoors with a good book.
February
February remains chilly and damp. Temperatures stay similar to January, making it 1 of the coldest times to visit the Cyclades. You will experience a mix of bright winter sunshine and sudden rain storms. The wind can feel biting, especially in the high villages. Swimming is not recommended as the water temperature is at its lowest. Visitor numbers are practically 0. If you visit in February, you will experience the raw, authentic side of island life, but you must pack warm layers and waterproof clothing.
March
March signals the very beginning of spring. Temperatures slowly start to climb, reaching around 16 degrees Celsius during the day. Rainfall begins to decrease, though you should still expect a few wet days. The landscape turns a vibrant green, filled with wild spring flowers. The sea remains cold, so beach days are mostly for walking rather than swimming. Tourist facilities are still mostly closed, but the longer daylight hours make this a beautiful time for hiking and capturing stunning photographs of the rugged terrain.
April
April offers a noticeable shift towards warmer weather. Daytime temperatures often reach 18 degrees Celsius, providing comfortable conditions for exploring. Rain becomes much less frequent, and the sun shines for many hours each day. The sea is still brisk, but brave swimmers might attempt a quick dip by the end of the month. Easter often falls in April, bringing a festive atmosphere to the local villages. This is an excellent month for outdoor activities like walking the ancient trails before the intense summer heat arrives.
May
May is a wonderful time to visit Serifos. The weather is genuinely warm, with daytime highs averaging 21 degrees Celsius. Rain is rare, and the skies are mostly bright blue. The sea temperature gradually rises, making swimming much more enjoyable. The Meltemi wind has not yet started in earnest, so the beaches remain calm and peaceful. Hotels and restaurants begin opening their doors. May offers a fantastic balance of beautiful spring weather, colourful landscapes and quiet beaches, making it ideal for visitors who prefer a relaxed pace.
June
June marks the start of the true summer season. You can expect hot, dry and sunny weather every day. Temperatures regularly reach 25 degrees Celsius, creating perfect conditions for sunbathing. The sea is wonderfully warm and inviting. The famous Meltemi wind is usually quite light in June, meaning boat trips and ferry crossings are generally smooth. The island starts to get busier, but it rarely feels overcrowded. June is brilliant for travellers who want guaranteed beach weather without the intense heat and busy atmosphere of peak summer.
July
July brings the peak of the Mediterranean summer. Days are hot, with temperatures averaging 27 degrees Celsius, though heatwaves can push this higher. Rain is almost non existent. This is also when the Meltemi wind usually begins to blow strongly. This northerly wind helps to make the high temperatures feel more comfortable, but it can make exposed beaches feel very gusty. The sea is delightfully warm. July is a busy travel period, perfect for those who love a vibrant holiday atmosphere and long days by the water.
August
August is the hottest and busiest month on the island. Daytime temperatures often sit around 28 degrees Celsius. The sun is intense, and rainfall is virtually 0. The Meltemi wind is frequently at its strongest during August. While this breeze provides relief from the heat, it can occasionally disrupt ferry schedules and make outdoor dining tricky in the exposed main village. The sea is at its warmest. This month is ideal for visitors who thrive in hot weather and want to experience the peak Greek holiday season.
September
September is widely considered 1 of the best months to visit. The intense summer heat softens, with daytime temperatures settling around 26 degrees Celsius. The Meltemi wind usually dies down, resulting in calm, clear days. The sea remains wonderfully warm from the summer sun, offering the best swimming conditions of the year. The large summer crowds depart, leaving the beaches much quieter. September is perfect for combining relaxed beach days with comfortable hiking and sightseeing around the island.
October
October brings a transition into autumn. Early October still feels like summer, with temperatures around 23 degrees Celsius. However, as the month progresses, the chance of rain increases and the evenings become noticeably cooler. The sea is still warm enough for swimming, especially in the 1st 2 weeks. Tourist businesses slowly begin to close down towards the end of the month. October appeals to visitors who enjoy mild weather, empty beaches and spectacular autumn sunsets, provided they do not mind occasional cloudy days.
November
November sees a significant change in the weather. Temperatures drop to around 19 degrees Celsius during the day, and the nights feel quite cold. This is 1 of the wetter months, so you should expect regular rain showers. The sea cools down rapidly, ending the swimming season for most people. The island returns to its quiet winter routine, with very few visitors around. November is suited for travellers seeking a peaceful retreat, provided they come prepared with warm clothing and waterproof gear.
December
December is the wettest and cloudiest month of the year. Daytime highs hover around 17 degrees Celsius, while nights can drop to 10 degrees Celsius. You will experience frequent rain and strong winter winds. Sunshine is scarce, and the days are at their shortest. The island is completely quiet, and almost all tourist facilities are closed. Visiting in December is only recommended for those who want to experience absolute solitude and the dramatic winter beauty of the Aegean Sea.
Wind and Meltemi
The wind is a major feature of the weather in the Cyclades. The most famous weather phenomenon is the Meltemi. This is a strong, dry northerly wind that blows across the Aegean Sea during the summer.
The Meltemi normally affects the region from late May until early October. It is usually at its most powerful during July and August. These winds typically blow from morning until evening, often dying down slightly after sunset before returning at dawn.
On Serifos, the Meltemi can have a significant impact. The main village, called the Chora, is perched on a high, exposed mountain peak. When the northerly wind blows strongly, the Chora takes the full force of the gusts. This can make the village feel much cooler than the coastal areas, but it also means outdoor dining or walking through the narrow streets can feel very breezy.
For visitors, strong winds can make a hot day feel surprisingly cool. Even when the sun is shining brightly, you might need a light jacket in the evening if the Meltemi is active.
The wind also affects how you plan your beach days. Because the Meltemi blows from the north, beaches on the northern coast bear the brunt of the waves and wind. These northern beaches can become choppy and uncomfortable for sunbathing. However, Serifos has many beautiful beaches on its southern and eastern coasts. These southern areas are naturally sheltered by the island terrain. When the north wind is blowing, the water on the south side usually remains calm and flat like glass, creating perfect swimming conditions.
Hiking can be pleasant during a moderate Meltemi, as the breeze prevents you from overheating on the exposed trails. However, very strong gusts can make walking on high ridges challenging.
Finally, wind can affect boat trips and ferries. Fast ferries are more sensitive to rough seas than the larger, conventional vessels. If the wind reaches very high speeds, ferry crossings might be delayed or rarely cancelled. Do not assume your ferry will be cancelled just because it feels windy on land. Always check with your operator and official port authorities for the latest updates when conditions seem poor.
Weather for Activities
Beach days
The best weather conditions for beach days occur between June and September. During these months, you can expect brilliant sunshine, clear skies and temperatures consistently above 25 degrees Celsius. Rain is incredibly rare during the summer, so your plans are unlikely to be ruined by wet weather. The wind is the only factor you need to monitor. On days when the northerly Meltemi wind is strong, you should head to the southern beaches for the most comfortable sunbathing. The southern coastline blocks the wind, keeping the sand still and the environment warm. Early June and September offer excellent beach weather without the extreme heat of mid summer.
Swimming
The usual swimming season in Serifos runs from late May through to October. Both air temperature and sea temperature play a crucial role in your enjoyment. In July and August, the sea warms up beautifully, reaching around 24 degrees Celsius. This makes swimming incredibly refreshing against the hot summer air. Wind and waves also affect your experience significantly. Strong northerly winds create choppy waves on northern beaches, making swimming less relaxing and sometimes challenging. For the calmest waters, always choose the sheltered southern bays when the wind is up. September is arguably the greatest month for swimming, as the sea retains its peak summer warmth while the outside air feels perfectly comfortable.
Hiking and walking
The best general weather conditions for walking and hiking are found in spring and autumn. April, May, September and October provide the most comfortable climate for exploring the trails. During these months, the heat is manageable, and the sun exposure is less intense than in mid summer.
If you choose to hike during July or August, the heat can be punishing. There is very little natural shade on the island, meaning UV levels are high. During these hot months, you must start your walks very early in the morning before the sun reaches its peak. Afternoon hiking in the summer is not recommended.
A moderate breeze is actually very helpful when walking, as it cools you down. However, you should avoid high coastal paths during heavy rain or extremely fierce winds. Springtime hiking rewards you with cooler temperatures and landscapes covered in colourful wildflowers.
Boat trips and sailing
Taking a boat trip is a wonderful way to see the hidden coves of Serifos. However, your experience depends entirely on wind and sea conditions. When the weather is calm, usually in June or September, sailing is a smooth and delightful experience.
During July and August, the Meltemi wind can make the sea quite rough, especially on the northern side of the island. Strong winds create large waves that can make small boat trips bumpy and uncomfortable. Sometimes, captains will alter their routes to stay on the sheltered southern side.
Always listen to the advice of local captains regarding sea conditions. Remember to check your operator for the latest information, as safety always comes first when dealing with the Aegean Sea.
Sightseeing and photography
The most comfortable weather for exploring villages, viewpoints and historical sites is during the shoulder seasons of May, June and September. The natural light during these months is soft and clear, making it exceptional for photography.
In peak summer, the midday heat makes climbing the steep steps of the Chora quite exhausting. If you visit in July or August, aim to do your sightseeing in the early morning or late evening. The high altitude of the main village means it catches the wind, which provides a welcome cooling effect when you are capturing photos of the spectacular landscape.
Best Time to Visit for Weather
Choosing the best time to visit depends entirely on what you want from your holiday. The weather changes dramatically across the seasons, so there is no single perfect month for every type of traveller.
Best months for hot beach weather
If your ideal holiday involves intense heat, brilliant sunshine and long days on the sand, July and August are the best months. Daytime temperatures regularly exceed 27 degrees Celsius, and rain is almost unheard of. This period gives you guaranteed beach weather. You will also experience the famous Meltemi winds, which help to take the edge off the extreme heat. The island is vibrant and fully open, making it the top choice for traditional summer holidays.
Best months for swimming
For the ultimate swimming experience, September is the greatest choice. The sea takes all summer to absorb the heat of the sun, meaning the water is at its absolute warmest in September. The air temperature is slightly cooler than in August, making it much more comfortable to dry off on the beach. The strong summer winds usually drop, resulting in calm, clear waters that are perfect for long, relaxing swims.
Best months for hiking
Hikers should target April, May and October. During these months, the weather is mild and pleasant. You avoid the dangerous midday heat of the summer, allowing you to walk for hours without severe sun exposure. In April and May, the landscape is exceptionally beautiful, filled with fresh green vegetation and spring flowers. October offers similarly cool temperatures, though the land is drier after the hot summer.
Best months for sightseeing
If your main goal is to explore the villages, photograph the architecture and visit historical sites, June and September are ideal. You will enjoy plenty of bright sunshine without the exhausting, draining heat of mid summer. Walking up the steep hills to the Chora is much easier when temperatures sit around 25 degrees Celsius. All the local tavernas and shops are open, giving you a full experience without the peak crowds.
Best months for fewer crowds and milder weather
For travellers who dislike extreme heat and busy beaches, May and October provide wonderful conditions. You will find mild daytime temperatures, cool evenings and plenty of space. The weather is still warm enough for light clothing during the day, though you will need a jumper at night. These months offer a peaceful, authentic view of the island, with very few tourists and a deeply relaxed atmosphere.
Does it snow in Serifos?
Snow is extremely rare on the island. Due to the mild Mediterranean climate, winter temperatures generally stay well above freezing. You might occasionally see a light dusting of snow on the highest mountain peaks during an unusually cold January or February, but it rarely settles on the ground for long and almost never affects the coastal areas.
What should I wear in the evenings during summer?
Even during the hottest months of July and August, evenings can feel surprisingly cool. The Chora is located high on a hill and catches the strong Meltemi winds. You should pack a light jumper, a cardigan or a windbreaker jacket for evening dining. During the day, standard summer tops and shorts are perfect.
Is the Meltemi wind dangerous?
The Meltemi is a natural weather pattern and is not generally dangerous on land. It can make walking on exposed cliffs difficult and blowing sand can be annoying on northern beaches. However, it can make sea conditions rough. Small boat trips might be cancelled for safety, but large ferries are built to handle these winds safely.
Can I swim in April or May?
Swimming in April is only for very brave people, as the sea temperature is usually around 16 degrees Celsius. By late May, the water starts to warm up to around 19 degrees Celsius. While it might still feel quite brisk when you first get in, many visitors find late May comfortable enough for a quick swim on a hot sunny day.
Which beaches are best when it is windy?
When the northerly winds are blowing strongly, you should avoid beaches on the northern coast as they will be wavy and uncomfortable. Instead, head to the southern beaches like Vagia, Ganema or Kalo Ampeli. The island blocks the wind from reaching these southern bays, keeping the water calm, flat and perfect for relaxing.
Are ferries often cancelled due to bad weather?
Ferry cancellations do happen, but they are not a daily occurrence. Fast catamarans are more likely to be delayed or cancelled when the wind exceeds 7 Beaufort. Large, conventional car ferries can handle much rougher seas and rarely cancel their routes. Always monitor official port updates if the wind feels exceptionally strong.
How hot does it actually get in August?
The average daytime high in August is around 28 degrees Celsius. However, during a summer heatwave, temperatures can easily climb above 35 degrees Celsius. The strong summer breeze often masks how hot the sun truly is, making it easy to get sunburned. You must drink plenty of water and wear high protection sunscreen.
Does the island get much rain in summer?
Rainfall during the summer is incredibly rare. From June to August, you are highly unlikely to see any rain at all. If a summer storm does occur, it is usually very brief and the sun comes back out quickly. You generally do not need to pack an umbrella for a peak summer holiday.
Is October too late to visit for sunshine?
October is not too late, but the weather is less predictable than in summer. The 1st half of October often brings beautiful sunny days with temperatures around 23 degrees Celsius. As the month goes on, the chance of cloudy days and rain showers increases. It is a great time for walking, but beach weather is not guaranteed.
What is the humidity like?
The climate is generally quite dry, especially during the summer. The Meltemi wind helps to blow away moisture, keeping humidity levels very low in July and August. This means the heat feels crisp rather than sticky and uncomfortable. Humidity levels only start to rise noticeably during the wetter winter months.
