Kefalonia weather in September 2025

Expect 27°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Kefalonia in September. Check more long-term weather averages for Kefalonia in September before you book your next holiday to Kefalonia in 2025/2026.

  • 27°C maximum daytime temperature in September in Kefalonia (Argostoli)27
    27°C max day temperature
  • 9 hours of sunshine per day
  • 4 days with some rainfall in September in Kefalonia (Argostoli)4
    4 days with some rainfall
  • 17°C minimum night-time temperature in September in Kefalonia (Argostoli)17
    17°C min night temperature
  • 12 hours of daylight per day in September in Kefalonia (Argostoli)12
    12 hours of daylight per day
  • Moderate heat & humidity in September in Kefalonia (Argostoli)M
    Moderate heat & humidity
  • 47 mm monthly rainfall in September in Kefalonia (Argostoli)47
    47 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Kefalonia (Argostoli)7
    7 (High) UV index
  • 25°C sea temperature in September in Kefalonia (Argostoli)25
    25°C sea temperature

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The September weather guide for Kefalonia (Argostoli) 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 Kefalonia destinations

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

All Kefalonia destinations

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

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How hot is it in Kefalonia in September?

Daytime temperatures usually reach 27°C in Argostoli, Kefalonia in September with moderate heat and humidity, falling to 17°C at night.

How sunny is it in Kefalonia in September?

There are normally 9 hours of bright sunshine each day in Argostoli, Kefalonia in September - that's 75% of daylight hours.

How warm is the sea around Kefalonia in September?

The average sea temperature around Argostoli, Kefalonia in September is 25°C.

Does it rain in Kefalonia in September?

There are usually 4 days with some rain in Argostoli, Kefalonia in September and the average monthly rainfall is 47mm.

Kefalonia September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:08 19:08
Monday, 15th September 2025 06:20 18:46
Tuesday, 30th September 2025 06:33 18:22

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