Best time to visit Syros

The best time to visit Syros, also known as Siros or Syra, for a beach holiday is during July and August.

However, anytime from mid-May through June, and the first two weeks of September are also good to visit Syros – the excessive summer heat has passed, the sea is still warm, the crowds have mostly left and all the facilities are still open.

July and August are the peak summer months, when Syros has the most visitors and prices sky-rocket.

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Syros weather

Syros enjoys a Mediterranean climate with warm, sunny summers and cool, wet winters. The island is windy year-round.

The cool and refreshing sea breeze - the Meltemi – is fairly consistent throughout summer, but is especially strong during July and August.

The breeze keeps the temperatures lower than elsewhere in the Aegean, with the maximum temperature in Syros rarely higher than 30°C (86°F).

Summer, from June to mid-September, is warm and sunny, but also windy.

Autumn, from mid-September to November, is initially warm and sunny, but gradually becomes cool and wet. Autumn is also windy.

Winter, from December to mid-March, is mild, wet and windy. On rare occassions it can snow. December and January are the wettest months.

Spring, from mid-March to May, is mild and sunny, interspersed with wet and windy weather. By mid-May, the Meltemi begins to blow – a persistent cool and dry wind from the north.

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What is the best month to visit Syros?
The summer months of June through September are the best months to visit Syros – the climate is perfect with hot, sunny weather and little to no rainfall.

July and August are especially popular, however this is peak tourist season in Syros with greater crowds and higher prices.

Which is the hottest month in Syros?
The hottest month in Syros is usually August, with an average high temperature of 31°C (87°F), with moderate heat and humidity and a low of 21°C (71°F).

On the warmest days of the month, the temperature may reach 33°C (91°F).

The warm season lasts from early-June through to mid-September, with an average daily high temperature above 26°C (78°F)

Which is the coldest month in Syros?
The coldest month in Syros is January, with an average high of 14°C (57°F) and a low of 9°C (48°F).

The cool season lasts from early-December through March, with an average daily high temperature below 16°C (61°F).

Which is the sunniest month in Syros?
The sunniest time of year in Syros is usually July with an average of 12 hours of sunshine per day – that's on average 84% of daylight hours.

What is the humidity in Syros?
Syros experiences seasonal variation in perceived humidity, with approximate average relative humidity calculated at between 57% – 70% over the course of the year.

What do the humidity conditions feel like in Syros?
We derive the humidity comfort level – what conditions feel like – from the dew point temperature, which measures moisture content in the atmosphere: a higher dew point feels more humid, while a lower dew point feels drier.

Meteorologists agree that dew point temperature is a more consistant indication of 'absolute humidity' than relative humidity, which fluctuates with temperature.

The average annual dew point in Syros is 12°C (53°F), and varies over the course of the year from dry at 6°C (43°F) to mainly comfortable at 18°C (64°F).   

The more humid time of year in Syros lasts from mid-June through to mid-October, when you can expect the comfort level to be humid about 8% of the time.

The month with the most muggy days in Syros is August, with nine days on average that may feel humid.

November through May is generally comfortable, with no days in any month that are humid.

When is the sea warmest in Syros?
The sea is usually at its warmest in Syros in August when the water temperature averages 24°C (75°F), which is warm enough for swimming.

The sea is warm enough for swimming during the months of July to September.

Which month has the most rain in Syros?
January and December are equally the wettest months in Syros with on average 100mm (4in) and 10 days of some rainfall in each month.

The wet season usually lasts from mid-October through March, with a greater than 16% chance of a given day being a wet day. You can expect light showers.

The drier season lasts from April to mid-October. The months with the least rainfall in Syros are July and August.

Which is the windiest month in Syros?
The windiest month of the year in Syros is February, with an average hourly wind speed of more than 25 kilometres per hour (13 knots; 15 mph).

The windy part of the year lasts from early-October through March, with average wind speeds of more than 21 kilometres per hour (11 knots; 13 mph).

The less-windy time of year lasts from early-April through to early-October. The calmest month of the year in Syros is May, with an average hourly wind speed of 17 kilometres per hour (9 knots; 11 mph).

The predominant average hourly wind direction in Syros is from the north throughout the year.

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Syros Weather Averages

Holiday seasons

High season: July and August, when hotel and restaurant prices sky-rocket.

Low season: From March to June – the temperature is cooler, hotel prices are more reasonable and the crowds non-existent.

Note: The winter off-season, from November through February, is generally quiet everywhere; many hotels, restaurants and bars close down and the beaches are deserted. Ferry and air services are dramatically reduced.

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Source: Meteorological data for Syros is based on weather statistics gathered during 2012 to 2021 by the Hellenic National Meteorological Service (HNMS) from the closest weather station: Mykonos Airport (JMK), located 36km (22mi) east of Syros Island. This station is deemed sufficiently nearby to be relied upon as the primary source for historical climate records, although weather conditions in Syros may vary slightly.

Advice on the best time to visit a particular destination is based on average local weather statistics, when the weather conditions are generally better than at other times of the year. We consider high and low temperatures, risk of rain (and thunderstorms, etc.), amount of sunshine and sea temperature. For general outdoor activities we favour clear, rainless days with a temperature range between 18°C (64°F) and 27°C (80°F); and for hot-weather activities we favour clear, rainless days with a temperature range between 24°C (75°F) and 32°C (89°F). Often, the best times to visit correspond to high season and therefore involve higher prices.

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Latest update: Best time to visit Syros: 6 June, 2024

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Disclaimer: The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data and conditions at any given location and time are unpredictable and variable. We assume no responsibility and can not be held legally responsible for any decisions made on the basis of the information presented on this site.

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