Alonissos weather in September 2025

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

  • 25°C maximum daytime temperature in September in Alonissos25
    25°C max day temperature
  • 10 hours of sunshine per day
  • 3 days with some rainfall in September in Alonissos3
    3 days with some rainfall
  • 16°C minimum night-time temperature in September in Alonissos16
    16°C min night temperature
  • 12 hours of daylight per day in September in Alonissos12
    12 hours of daylight per day
  • Low heat & humidity in September in AlonissosL
    Low heat & humidity
  • 46 mm monthly rainfall in September in Alonissos46
    46 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Alonissos6
    6 (High) UV index
  • 24°C sea temperature in September in Alonissos24
    24°C sea temperature

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The September weather guide for Greece (Alonissos) 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 Alonissos in September?

Daytime temperatures usually reach 25°C in Alonissos in September with low heat and humidity, falling to 16°C at night.

How sunny is it in Alonissos in September?

There are normally 10 hours of bright sunshine each day in Alonissos in September - that's 77% of daylight hours.

How warm is the sea around Alonissos in September?

The average sea temperature around Alonissos in September is 24°C.

Does it ever rain in Alonissos in September?

There are usually 3 days with some rain in Alonissos in September and the average monthly rainfall is 46mm.

Alonissos September sunrise & sunset times

Browse the sunrise and sunset times for Alonissos in September 2025. Select a month to view Alonissos sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:53 18:55
Monday, 15th September 2025 06:06 18:33
Tuesday, 30th September 2025 06:20 18:09

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