Saint Simons Island
Georgia, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and Climate
Saint Simons Island, GA

  • The average high temperature in September: 29°C

The warmest month (with the highest average high temperature) is July (32°C).
The month with the lowest average high temperature is January (16°C).

  • The average low temperature in September: 22°C

Months with the highest average low temperature are July and August (23°C).
The coldest month (with the lowest average low temperature) is January (5°C).

  • The average rainfall in September: 179mm

The wettest month (with the highest rainfall) is September (179mm).
The driest month (with the lowest rainfall) is November (66mm).

  • The average rainfall days in September: 11 days

Months with the highest number of rainy days are July and August (14 days).
The month with the lowest number of rainy days is November (6 days).

  • The average sea temperature in September: 28°C

Best months for swimming (with the highest average sea temperature) are July, August and September (28°C).
Coldest months (with the lowest average sea temperature) are February and March (20°C).

  • The average daylight in September: 12h

Months with the longest days are May, June and July (Average daylight: 14h).
Months with shortest days are January and December (Average daylight: 10h).

  • The average sunshine in September: 7h

The month with most sunshine is May (Average sunshine: 10h).
Months with least sunshine are January and December (Average sunshine: 6).

  • The average UV index in September: 9

Months with the highest UV index are June and July (UV index 11).
Months with the lowest UV index are January, November and December (UV index 4).