Atlanta
Georgia, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and Climate
Atlanta, GA

Beautiful sky and cityscape of Atlanta in Georgia, USA
Beautiful sky and cityscape of Atlanta in Georgia, USA
The start of autumn signals warm temperatures but also storms and cloudburst. The atmospheric climate is mild, humid, and soggy. With humidity still high at 75% and sunlight hours averaging 8.1 hours per day, September is a bit dump time to visit. Daytime temperatures are a muggy 82.4°F (28°C) and hardly goes below 69.8°F (21°C). Nights are relaxed with temperatures of 62.6°F (17°C).
  • The average high temperature in September: 27.9°C

The warmest month (with the highest average high temperature) is July (31.7°C).
The month with the lowest average high temperature is January (11.3°C).

  • The average low temperature in September: 18.2°C

The month with the highest average low temperature is July (21.8°C).
The coldest month (with the lowest average low temperature) is January (1.3°C).

  • The average humidity in September: 73.9%

The month with the highest relative humidity is August (74.8%).
The month with the lowest relative humidity is April (61%).

  • The average rainfall in September: 113.5mm

The wettest month (with the highest rainfall) is July (133.9mm).
The driest month (with the lowest rainfall) is April (85.3mm).

  • The average rainfall days in September: 7.5 days

The month with the highest number of rainy days is July (11.7 days).
The month with the lowest number of rainy days is October (6.9 days).

  • The average snowfall in September: 0mm

The month with the highest snowfall is January (33mm).
Months with the lowest snowfall are April, May, June, July, August, September, October and November (0mm).

  • The average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.8 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September, October and November (0 days).

  • 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, November and December (Average daylight: 10h).

  • The average sunshine in September: 7.6h

The month with most sunshine is June (Average sunshine: 9.5h).
Months with least sunshine are January and December (Average sunshine: 5.3).

  • The average UV index in September: 8

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).

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