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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 max day temperature
29 - 7 hours of sunshine per day
- 11 days with some rainfall
11 - 22°C min night temperature
22 - 12 hours of daylight per day
12 - High heat & humidity
H - 179 mm of monthly rainfall
179 - 9 (Very High) UV index
9 - 27°C sea temperature
27
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Recommended for Georgia
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)
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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