Syros weather in September 2025

Expect 25°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Syros in September. Check more long-term weather averages for Syros in September before you book your next holiday to Syros in 2025/2026.

  • 25°C maximum daytime temperature in September in Syros (Ermoupolis)25
    25°C max day temperature
  • 10 hours of sunshine per day
  • 1 day with some rainfall in September in Syros (Ermoupolis)1
    1 day with some rainfall
  • 19°C minimum night-time temperature in September in Syros (Ermoupolis)19
    19°C min night temperature
  • 12 hours of daylight per day in September in Syros (Ermoupolis)12
    12 hours of daylight per day
  • Low heat & humidity in September in Syros (Ermoupolis)L
    Low heat & humidity
  • 12 mm monthly rainfall in September in Syros (Ermoupolis)12
    12 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Syros (Ermoupolis)7
    7 (High) UV index
  • 23°C sea temperature in September in Syros (Ermoupolis)23
    23°C sea temperature

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The September weather guide for Syros, represented by Ermoupolis, (Ermoupolis) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Syros in September?

Daytime temperatures usually reach 25°C in Ermoupolis, Syros in September with low heat and humidity, falling to 19°C at night.

How sunny is it in Syros in September?

There are normally 10 hours of bright sunshine each day in Ermoupolis, Syros in September - that's 84% of daylight hours.

How warm is the sea around Syros in September?

The average sea temperature around Ermoupolis, Syros in September is 23°C.

Does it ever rain in Syros in September?

There is usually 1 day with some rain in Ermoupolis, Syros in September and the average monthly rainfall is 12mm.

Syros September sunrise & sunset times

Browse the sunrise and sunset times for Syros in September 2025. Select a month to view Syros sunrise and sunset times for the next 12 months. The Syros sunrise and sunset times shown below are for Ermoupolis.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:51 18:49
Monday, 15th September 2025 06:02 18:28
Tuesday, 30th September 2025 06:15 18:05

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