Porto Heli weather in September 2025

Expect 28°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Porto Heli in September. Check more long-term weather averages for Porto Heli in September before you book your next holiday to Peloponnese in 2025/2026.

  • 28°C maximum daytime temperature in September in Porto Heli28
    28°C max day temperature
  • 10 hours of sunshine per day
  • 2 days with some rainfall in September in Porto Heli2
    2 days with some rainfall
  • 17°C minimum night-time temperature in September in Porto Heli17
    17°C min night temperature
  • 12 hours of daylight per day in September in Porto Heli12
    12 hours of daylight per day
  • Moderate heat & humidity in September in Porto HeliM
    Moderate heat & humidity
  • 14 mm monthly rainfall in September in Porto Heli14
    14 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Porto Heli7
    7 (High) UV index
  • 25°C sea temperature in September in Porto Heli25
    25°C sea temperature

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The September weather guide for Peloponnese (Porto Heli) 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 Porto Heli in September?

Daytime temperatures usually reach 28°C in Porto Heli in September with moderate heat and humidity, falling to 17°C at night.

How sunny is it in Porto Heli in September?

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

How warm is the sea around Porto Heli in September?

The average sea temperature around Porto Heli in September is 25°C.

Does it ever rain in Porto Heli in September?

There are usually 2 days with some rain in Porto Heli in September and the average monthly rainfall is 14mm.

Porto Heli September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:58 18:56
Monday, 15th September 2025 06:09 18:35
Tuesday, 30th September 2025 06:22 18:12

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