AI-generatedSyros at a glance
- Best time
- Jul – Sep
- Warmest month
- Aug · 26°
- Warmest sea
- Aug · 24.6°
- Sunshine a year
- 2,870 h
- Rain a year
- 368 mm
- Climate
- Mediterranean
- Time zone
- UTC+2 / UTC+3
- Elevation
- 141 m
Climate in Syros
Syros has a Mediterranean climate with warm to hot, dry summers and mild, wetter winters. August is the warmest month with average highs of 26 °C, while January is the coolest at 13 °C. With around 2,870 hours of sunshine a year, Syros is sunny; July is the sunniest month with 11.7 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Fair
Best time to visit: July – September
Good forSightseeing & walks
A typical day in October
- Morning, 08:00: about 18°
- Midday, 13:00: about 20°
- Afternoon, 16:00: about 20°
- Evening, 20:00: about 19°
- Night, 23:00: about 19°
07:2718:45
Pleasant evenings; a light layer can help.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:11–08:02 · evening 18:09–19:01
- Blue hour
- Morning 07:01–07:11 · evening 19:01–19:11
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Syros in October?
In October, Syros is mild: daytime highs average 20 °C, and nights cool down to about 18 °C. The sea averages 21.7 °C – refreshing for a swim. The sun shines for around 7 hours a day. Rain is rare: about 4 days bring 29 mm in total. It is often windy, with gusts of around 33 km/h. All in all, October is a so-so month for a holiday in Syros.
More details for October
- Daylight
- 11 h 18 min07:27 – 18:45
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 5 daysdew point 18 °C or moreAll months
- Wind
- 33 km/haverage daily peakAll months
- Cloud cover
- 31 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+3Europe/Athens
How the score comes together
- Temperatureweight 35 %22 %
- Seaweight 25 %67 %
- Sunshineweight 20 %72 %
- Few rainy daysweight 20 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Swimwear
- Sunscreen
- Windproof jacket
Sea temperature in Syros
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 20.5 – 22.9 °C
Swimming season: Jun – Oct
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Syros ranges from 15.6 °C in February to 24.6 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to October.
From September to April the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 23.7 and 25.5 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 16.0° | 15.0° | 16.9° | cold |
| FebruaryFeb | 15.6° | 14.9° | 16.2° | cold |
| MarchMar | 15.8° | 15.0° | 16.4° | cold |
| AprilApr | 16.5° | 15.6° | 17.1° | cold |
| MayMay | 18.6° | 17.8° | 19.4° | fresh |
| JuneJun | 21.8° | 21.0° | 22.8° | refreshing |
| JulyJul | 23.8° | 23.0° | 24.5° | pleasant |
| AugustAug | 24.6° | 23.7° | 25.5° | pleasant |
| SeptemberSep | 23.8° | 22.5° | 24.6° | pleasant |
| OctoberOct | 21.7° | 20.5° | 22.9° | refreshing |
| NovemberNov | 19.1° | 17.9° | 20.5° | fresh |
| DecemberDec | 17.1° | 16.3° | 18.2° | fresh |
Sunshine hours in Syros
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 7.3 of 11.3 hours of daylight in Syros, 65 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Syros
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 5 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 10).
Minutes until sunburn in October
- Very fair skin
- about 30 min
- Fair skin
- about 35 min
- Light brown skin
- about 50 min
- Olive skin
- about 65 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Syros: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Syros has about 4 rainy days with 29 mm of rain in total.
Wind and clouds in Syros
How breezy and how cloudy Syros is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Syros typically peaks at 33 km/h during the day: Beaufort 5, fresh breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting, and here it gets there all year.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 31 % of the sky over Syros: mostly sunny, with about 7.3 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Syros
How often the day gets hot in Syros (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Syros has about 0 hot days, with an average daytime high of 20 °C: some hot or muggy days. Single hot or muggy days are possible; a hat and water bottle are enough.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Syros
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cool 8–15°
- Pleasant 15–20°
- Warm 20–24°
- muggy month (10+ muggy days)
PleasantOctober: nights around 18°. Ideal for sleeping, often with the window open. Muggy on about 5 days (dew point 18 °C or more).
The coolest nights are in January (10°), the warmest in August (23°). Tropical nights of 20 °C and more are the rule from June to September; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) in May and from October to November. It is muggy (dew point 18 °C or more) on about 88 days a year, mostly from June to September.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 13 | 13° | 10° | 16.0° | 4.2 h | 11 | 79 |
| FebruaryFeb | 20 | 13° | 10° | 15.6° | 5.0 h | 9 | 60 |
| MarchMar | 28 | 14° | 11° | 15.8° | 6.7 h | 7 | 47 |
| AprilApr | 39 | 16° | 13° | 16.5° | 8.6 h | 4 | 20 |
| MayMay | 50 | 20° | 16° | 18.6° | 9.7 h | 2 | 8 |
| JuneJun | 84 | 24° | 20° | 21.8° | 11.6 h | 1 | 3 |
| JulyJul | 99 | 26° | 23° | 23.8° | 11.7 h | 0 | 0 |
| AugustAug | 100 | 26° | 23° | 24.6° | 10.9 h | 0 | 1 |
| SeptemberSep | 92 | 24° | 21° | 23.8° | 9.3 h | 1 | 6 |
| OctoberOct | 59 | 20° | 18° | 21.7° | 7.3 h | 4 | 29 |
| NovemberNov | 32 | 17° | 15° | 19.1° | 5.4 h | 6 | 43 |
| DecemberDec | 14 | 14° | 12° | 17.1° | 3.8 h | 10 | 73 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
37.45° N, 24.94° E · 141 m · Europe/Athens
Best time to visit Syros
The best time to visit Syros is from July to September. For a beach holiday with the sea above 21 °C, go from June to September. For sightseeing, day trips and hiking, conditions are most comfortable from April to November. The wettest month is January with 79 mm of precipitation.
Syros through the seasons
How the weather changes over the seasons, with averages for each.
Syros in spring
Mar – May
Poor
- 14–20 °C by day
- Sea 17 °C
- 8 h of sun a day
- 12 rainy days in all
Syros in summer
Jun – Aug
Excellent
- 24–26 °C by day
- Sea 23 °C
- 11 h of sun a day
- 1 rainy days in all
Syros in autumn
Sep – Nov
Good
- 17–24 °C by day
- Sea 22 °C
- 7 h of sun a day
- 11 rainy days in all
Syros in winter
Dec – Feb
Poor
- 13–14 °C by day
- Sea 16 °C
- 4 h of sun a day
- 30 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Syros for you.
Your best months: July – August
Based on the climate averages; tap a month to see its details.
Compare two months in Syros
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
August has the better holiday weather in Syros: score 100 against 59. In August, days are 6 °C warmer than in October. The sea is 3 °C warmer in August. August has 4 fewer rainy days. The sun shines 4 hours longer a day in August.
| Month | October | August |
|---|---|---|
| Weather score | 59 | 100better |
| Day high | 20° | 26° |
| Night low | 18° | 23° |
| Sea | 21.7° | 24.6° |
| Sunshine | 7.3 h | 10.9 hbetter |
| Rainy days | 4 | 0better |
| Rainfall | 29 mm | 1 mmbetter |
| Muggy days | 5better | 28 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Jun – Sep
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Apr – Nov
15–28 °C and not too much rain
Syros month by month
The typical weather for every month at a glance.
13January13° · Sea 16° · 4 h
In January, Syros is cool: daytime highs average 13 °C, and nights cool down to about 10 °C. The sea averages 16.0 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 79 mm in total. It is often windy, with gusts of around 38 km/h. All in all, January is not an ideal month for a holiday in Syros.
Syros in January20February13° · Sea 16° · 5 h
In February, Syros is cool: daytime highs average 13 °C, and nights cool down to about 10 °C. The sea averages 15.6 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 60 mm in total. It is often windy, with gusts of around 38 km/h. All in all, February is not an ideal month for a holiday in Syros.
Syros in February28March14° · Sea 16° · 7 h
In March, Syros is cool: daytime highs average 14 °C, and nights cool down to about 11 °C. The sea averages 15.8 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 7 days, adding up to 47 mm. It is often windy, with gusts of around 35 km/h. All in all, March is not an ideal month for a holiday in Syros.
Syros in March39April16° · Sea 17° · 9 h
In April, Syros is mild: daytime highs average 16 °C, and nights cool down to about 13 °C. The sea averages 16.5 °C – swimming is only for the hardy. The sun shines for around 9 hours a day. Rain is rare: about 4 days bring 20 mm in total. It is often windy, with gusts of around 32 km/h. All in all, April is not an ideal month for a holiday in Syros.
Syros in April50May20° · Sea 19° · 10 h
In May, Syros is mild: daytime highs average 20 °C, and nights cool down to about 16 °C. The sea averages 18.6 °C – bracing, so a wetsuit helps for longer swims. With around 10 hours of sunshine a day, there is plenty of sun. It hardly ever rains. It is often windy, with gusts of around 29 km/h. All in all, May is a so-so month for a holiday in Syros.
Syros in May84June24° · Sea 22° · 12 h
In June, Syros is warm: daytime highs average 24 °C, and even at night it stays warm at around 20 °C. The sea averages 21.8 °C – refreshing for a swim. With around 12 hours of sunshine a day, there is plenty of sun. It hardly ever rains. It is often windy, with gusts of around 30 km/h. All in all, June is an excellent month for a holiday in Syros.
Syros in June99July26° · Sea 24° · 12 h
In July, Syros is warm: daytime highs average 26 °C, and even at night it stays warm at around 23 °C. The sea averages 23.8 °C – pleasant for swimming. With around 12 hours of sunshine a day, there is plenty of sun. It hardly ever rains. The air is often humid and muggy. It is often windy, with gusts of around 34 km/h. All in all, July is an excellent month for a holiday in Syros.
Syros in July100August26° · Sea 25° · 11 h
In August, Syros is warm: daytime highs average 26 °C, and even at night it stays warm at around 23 °C. The sea averages 24.6 °C – pleasant for swimming. With around 11 hours of sunshine a day, there is plenty of sun. It hardly ever rains. The air is often humid and muggy. It is often windy, with gusts of around 35 km/h. All in all, August is an excellent month for a holiday in Syros.
Syros in August92September24° · Sea 24° · 9 h
In September, Syros is warm: daytime highs average 24 °C, and even at night it stays warm at around 21 °C. The sea averages 23.8 °C – pleasant for swimming. With around 9 hours of sunshine a day, there is plenty of sun. It hardly ever rains. It is often windy, with gusts of around 33 km/h. All in all, September is an excellent month for a holiday in Syros.
Syros in September59October20° · Sea 22° · 7 h
In October, Syros is mild: daytime highs average 20 °C, and nights cool down to about 18 °C. The sea averages 21.7 °C – refreshing for a swim. The sun shines for around 7 hours a day. Rain is rare: about 4 days bring 29 mm in total. It is often windy, with gusts of around 33 km/h. All in all, October is a so-so month for a holiday in Syros.
Syros in October32November17° · Sea 19° · 5 h
In November, Syros is mild: daytime highs average 17 °C, and nights cool down to about 15 °C. The sea averages 19.1 °C – bracing, so a wetsuit helps for longer swims. Expect around 5 hours of sunshine a day. Rain falls on about 6 days, adding up to 43 mm. It is often windy, with gusts of around 34 km/h. All in all, November is not an ideal month for a holiday in Syros.
Syros in November14December14° · Sea 17° · 4 h
In December, Syros is cool: daytime highs average 14 °C, and nights cool down to about 12 °C. The sea averages 17.1 °C – bracing, so a wetsuit helps for longer swims. The sun is scarce, with only about 4 hours a day. Rain is frequent, with about 10 rainy days and 73 mm in total. It is often windy, with gusts of around 37 km/h. All in all, December is not an ideal month for a holiday in Syros.
Syros in DecemberSyros compared
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Syros vs. Tinos
In October the holiday weather in Syros and Tinos is about equally good (score 59 vs. 62). During the day Tinos is 1 °C warmer than Syros. The sea in Tinos is 1 °C cooler. Tinos gets one more hour of sunshine a day.
| in October | Syros | Tinos |
|---|---|---|
| Holiday score | 59 | 62 |
| Daytime high | 20° | 21° |
| Sea | 22° | 21° |
| Sunshine | 7 h | 8 h |
| Rainy days | 4 | 3 |
| Best time | Jul – Sep | Jun – Sep |
Through the year
Greece in October: the best places
In October, Syros ranks 27 among the 31 nearest destinations in this country.
- Athens23°23°91
- 2Piraeus23°23°91
- 3Mycenae23°90
- 4Sparta24°88
- 5Thebes22°84
- 6Nafplio23°23°78
- 7Árgos23°23°77
- 8Salamis Island23°23°76
- 27SyrosThis page20°22°59
Planning a trip to Syros
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Syros in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Syros has its best school-holiday weather during the summer holidays (score 100) and its weakest during the Christmas holidays (score 14).
- 36
Easter holidays
Mar – Apr
Poor
- 16 °C by day
- Sea 16 °C
- 8.0 h of sun a day
- 5 rainy days a month
- 57
May half-term
May – Jun
Fair
- 20 °C by day
- Sea 19 °C
- 10.1 h of sun a day
- 2 rainy days a month
Good for: Sightseeing & walks
- 100
Summer holidays
Jul – Aug
ExcellentBest holidays
- 26 °C by day
- Sea 24 °C
- 11.2 h of sun a day
- 0 rainy days a month
Good for: Beach & swimming, Sightseeing & walks
- 59
October half-term
Oct
Fair
- 20 °C by day
- Sea 22 °C
- 7.3 h of sun a day
- 4 rainy days a month
Good for: Sightseeing & walks
- 14
Christmas holidays
Dec – Jan
Poor
- 13 °C by day
- Sea 17 °C
- 4.0 h of sun a day
- 11 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 3 h 35 min
- Distance
- 2,530 km
- Time zone
- UTC+3
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Syros
When is the best time to visit Syros?
The best time to visit Syros is from July to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Syros?
The sea temperature in Syros ranges from 15.6 °C in February to 24.6 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to October.
Can you swim in Syros in October?
Yes. In October the sea averages 21.7 °C – refreshing for a swim.
What is the warmest month in Syros?
August is the warmest month, with average highs of 26 °C and nights around 23 °C. January is the coolest month at 13 °C.
When does it rain most in Syros?
The wettest month is January with 79 mm of precipitation. The driest month is July with 0 mm.
How many hours of sunshine does Syros get?
Syros gets around 2,870 hours of sunshine a year. The sunniest month is July with 11.7 hours a day; in December there are 3.8 hours a day.
What time zone is Syros in?
Syros uses the time zone Europe/Athens: UTC+2 in January and UTC+3 in July.
How long is the flight from London to Syros?
A nonstop flight from London to Syros takes about 3 h 35 min, for a straight-line distance of about 2,530 km.
Which school holidays are best for Syros?
Syros has its best school-holiday weather during the summer holidays (score 100) and its weakest during the Christmas holidays (score 14). Holiday ratings (0–100): Easter holidays 36, May half-term 57, Summer holidays 100, October half-term 59, Christmas holidays 14.
Near Syros
Other destinations close by.
Places with a climate like Syros
Destinations whose weather through the year is closest to Syros's – good alternatives.