Santorini weather in September 2025

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

  • 25°C maximum daytime temperature in September in Santorini (Thira)25
    25°C max day temperature
  • 10 hours of sunshine per day
  • 1 day with some rainfall in September in Santorini (Thira)1
    1 day with some rainfall
  • 20°C minimum night-time temperature in September in Santorini (Thira)20
    20°C min night temperature
  • 12 hours of daylight per day in September in Santorini (Thira)12
    12 hours of daylight per day
  • Low heat & humidity in September in Santorini (Thira)L
    Low heat & humidity
  • 13 mm monthly rainfall in September in Santorini (Thira)13
    13 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Santorini (Thira)7
    7 (High) UV index
  • 24°C sea temperature in September in Santorini (Thira)24
    24°C sea temperature

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The September weather guide for Santorini (Thira) 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.

Top Santorini destinations

Below are average maximum temperatures at popular countries, regions and places in Santorini in September. Select a holiday destination to see more weather parameters.

All Santorini destinations

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

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How hot is it in Santorini in September?

Daytime temperatures usually reach 25°C in Thira, Santorini in September with low heat and humidity, falling to 20°C at night.

How sunny is it in Santorini in September?

There are normally 10 hours of bright sunshine each day in Thira, Santorini in September - that's 83% of daylight hours.

How warm is the sea around Santorini in September?

The average sea temperature around Thira, Santorini in September is 24°C.

Does it ever rain in Santorini in September?

There is usually 1 day with some rain in Thira, Santorini in September and the average monthly rainfall is 13mm.

Santorini September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:50 18:46
Monday, 15th September 2025 06:01 18:26
Tuesday, 30th September 2025 06:13 18:03

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