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 first month of the autumn, September, is still a warm month in Atlanta, Georgia, with temperature in the range of an average low of 65.5°F (18.6°C) and an average high of 84.2°F (29°C).

Temperature

In September, the average high-temperature is almost the same as in August - a moderately hot 84.2°F (29°C). In Atlanta, in September, the average low-temperature is 65.5°F (18.6°C).

Heat index

The average heat index is calculated to a tropical 90.9°F (32.7°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'apparent temperature', or 'felt air temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, wind, clothing, and metabolic differences affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In September, the average relative humidity in Atlanta is 70%.

Rainfall

The month with the least rainfall is September when the rain falls for 8.6 days and typically collects 0.55" (14mm) of precipitation.

Snowfall

April through November are months without snowfall.

Daylight

In Atlanta, the average length of the day in September is 12.4h.

Sunshine

In Atlanta, Georgia, the average sunshine is 8.7h.

UV index

The average daily maximum UV index in Atlanta is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Atlanta?

In September, in Atlanta, the average high-temperature is 84.2°F (29°C), and the average low-temperature is 65.5°F (18.6°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), that calculates temperature value influenced by the moisture in the air, is calculated to 90.9°F (32.7°C).

What is the average humidity in September in Atlanta?

In Atlanta, Georgia, the average relative humidity in September is 70%.

How many days does it rain in September in Atlanta?

In Atlanta, Georgia, during September, the rain falls for 8.6 days and regularly aggregates up to 0.55" (14mm) of precipitation.

What is the driest month in Atlanta?

The month with the least rainfall in Atlanta, Georgia, is September when the rain falls for 8.6 days and typically collects 0.55" (14mm) of precipitation.

When it does not snow in Atlanta?

April through November are months without snowfall in Atlanta, Georgia.

What is the average length of the day in September in Atlanta?

The average length of the day in September is 12.4h.

How long on average sun shines in September in Atlanta?

In Atlanta, Georgia, the average sunshine in September is 8.7h.

How high is the UV index in September in Atlanta?

In Atlanta, Georgia, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Atlanta, GA
  • Average high temperature in September: 84.2°F

The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (50.5°F).

  • Average low temperature in September: 65.5°F

The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (34.9°F).

Average pressure in September - Atlanta, GA
  • Average pressure in September: 30.03"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.99").

Average wind speed in September - Atlanta, GA
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in September - Atlanta, GA
  • Average humidity in September: 70%

The month with the highest relative humidity is December (77%).
Months with the lowest relative humidity are July and August (69%).

Average rainfall in September - Atlanta, GA
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is August (2.32").
The driest month (with the least rainfall) is September (0.55").

Average rainfall days in September - Atlanta, GA
  • Average rainfall days in September: 8.6 days

The month with the highest number of rainy days is August (17.1 days).
The month with the least rainy days is November (6.9 days).

Average snowfall in September - Atlanta, GA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.2").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September - Atlanta, GA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.9 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Atlanta, GA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 8.7h

Months with the most sunshine are June and July (Average sunshine: 10.7h).
The month with the least sunshine is December (Average sunshine: 5.1h).

Average sunshine days in September - Atlanta, GA
  • Average sunshine days in September: 19.2 days

The month with the most sunshine days is October (22.6 days).
The month with the least sunshine days is July (10.9 days).

Average UV index in September - Atlanta, GA
  • Average UV index in September: 5

The month with the highest UV index is August (UV index 7).
Months with the lowest UV index are January and December (UV index 2).

Average cloud cover in September - Atlanta, GA
  • Average cloud cover in September: 30

The month with the most cloud cover is December (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 29).

Average visibility in September - Atlanta, GA
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).