St Simons Island weather in September 2025

Expect 29°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in St Simons Island in September. Check more long-term weather averages for St Simons Island in September before you book your next holiday to Georgia (USA) in 2025/2026.

  • 29°C maximum daytime temperature in September in St Simons Island29
    29°C max day temperature
  • 7 hours of sunshine per day
  • 11 days with some rainfall in September in St Simons Island11
    11 days with some rainfall
  • 22°C minimum night-time temperature in September in St Simons Island22
    22°C min night temperature
  • 12 hours of daylight per day in September in St Simons Island12
    12 hours of daylight per day
  • High heat & humidity in September in St Simons IslandH
    High heat & humidity
  • 179 mm monthly rainfall in September in St Simons Island179
    179 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in September in St Simons Island9
    9 (Very High) UV index
  • 27°C sea temperature in September in St Simons Island27
    27°C sea temperature

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The September weather guide for Georgia (USA) (St Simons Island) 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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More about the USA

How hot is it in St Simons Island in September?

Daytime temperatures usually reach 29°C in St Simons Island in September with high heat and humidity, falling to 22°C at night.

How sunny is it in St Simons Island in September?

There are normally 7 hours of bright sunshine each day in St Simons Island in September - that's 60% of daylight hours.

How warm is the sea around St Simons Island in September?

The average sea temperature around St Simons Island in September is 27°C.

Does it rain in St Simons Island in September?

There are usually 11 days with some rain in St Simons Island in September and the average monthly rainfall is 179mm.

What is the chance of a hurricane in St Simons Island in September?

On average 1.3 days in September in St Simons Island are likely to be affected by the passage of one or more tropical storms.

St Simons Island September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:02 18:49
Monday, 15th September 2025 06:10 18:31
Tuesday, 30th September 2025 06:19 18:11

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