Weather in Syros

Planning your visit? Discover everything about the current weather in Syros to prepare for your trip in the best possible way. Below you will find up-to-date forecasts and useful charts of meteorological data.

The climate of Syros can be described as classic Mediterranean, making this Greek island an attractive destination for travellers at any time of year. The weather here is notably stable: you can expect long, sunny, and dry summers, followed by mild and moderately humid winters. Thanks to its island location, it is rarely extremely hot or cold here, and sea breezes make the climate comfortable even at the height of the season.

The summer period, starting in May and lasting until the end of September, is a time of cloudless skies and warmth. It is particularly noteworthy that rain is almost completely absent in July and August, and the average air temperature holds at a pleasant +25°C. This creates ideal conditions for beach holidays and long walks, as exhausting heat is a rare phenomenon here.

With the arrival of November, the weather changes: the temperature gradually drops, and the number of overcast days increases. In winter, especially in January and December, precipitation falls more often, yet there is no cold on Syros—even on the coolest nights, the temperature rarely drops below +11°C. Spring and early autumn are considered wonderful times for those who wish to enjoy the island's nature without the summer influx of tourists.

The climate on the island of Syros is characterised by mildness and the absence of sharp temperature fluctuations, making a stay here comfortable at any time of year. The coolest period falls in January and February, when the average air temperature is around 12–13°C. Winter here is not harsh at all: even in the coldest months, minimum values rarely drop below 11.5°C, allowing you to enjoy walks without the need to bundle up in heavy winter clothing.

The summer season brings pleasant warmth and abundant sunshine to the island. The hottest months are July and August with average figures around 25.5°C. Notably, the summer heat here is tolerated quite easily: maximum temperatures average 26.3–26.6°C, creating ideal conditions for beach relaxation without exhausting heat. During this period, precipitation is practically non-existent, ensuring clear skies and dry weather for tourists.

A characteristic feature of the local climate is the surprising temperature stability throughout the day. According to statistics, the difference between daily highs and nightly lows on Syros is minimal and often amounts to just 1–2 degrees. This means that even after sunset, the air remains warm, and summer evenings offer the same comfortable sensation of warmth as the days. Transitional months, such as May and October, also delight with mild weather with average values around 19–20°C.

Precipitation on Syros is distributed unevenly throughout the year, following the classic Mediterranean scenario: a dry, sunny summer and a moderately wet winter. If you are planning a trip at the height of the tourist season, rain is unlikely to bother you, whereas in the low season, an umbrella might become a necessary accessory.

The driest period lasts from May to September. The summer months—June, July, and August—stand out in particular, when the probability of precipitation tends towards zero. For example, in July, statistics usually do not record a single rainy day. This is the ideal time for those who prefer guaranteed clear weather, as the sky remains cloudless almost constantly.

The rainy season begins in late autumn and reaches its peak in winter. The "wettest" months are January and December, when 12 to 13 days with precipitation are recorded. In February, the frequency of rain decreases slightly (about 9 days). Given the mild winter temperatures, which rarely drop below 11°C, precipitation falls exclusively as rain, and snow is an extremely rare phenomenon for this Greek island.

Syros, like many Cycladic islands, is famous for its sunny summers and refreshing sea breezes. For a trip during the high season, from June to September, the foundation of your wardrobe should be light clothing made from natural fabrics, such as cotton or linen. Be sure to take care of protection from the active sun: sunglasses, a hat, and high SPF cream are simply essential. Considering that evenings on the islands can be breezy, a light windbreaker or shawl will be an excellent addition to your summer outfit.

If you are planning a visit in the off-season or winter (from November to March), when the temperature hovers around 13–15°C, it is worth adhering to the principle of layering. During this period, the weather is more changeable, and the number of rainy days increases, so we recommend bringing warm jumpers, a mid-season jacket, and definitely an umbrella or a waterproof raincoat. Layered clothing will allow you to feel comfortable, easily adapting to weather changes throughout the day.

Regardless of the time of year, comfortable footwear is critically important. The island's capital, Ermoupoli, is known for its cobbled streets and numerous staircases, so reliable trainers or flat sandals are best suited for long walks. Leave high-heeled shoes for evening outings to a restaurant, and choose comfort and practicality for exploring the sights.