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

Weather in September

September, the first month of the autumn, in Atlanta, is also a moderately hot month, with average temperature ranging between min 65.5°F (18.6°C) and max 84.2°F (29°C).

Temperature

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

Heat index

The average heat index is evaluated at a tropical 90.9°F (32.7°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, metabolic differences, differences in body mass, height, and shape), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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 is 70%.

Rainfall

September is the month with the least rainfall in Atlanta. Rain falls for 8.6 days and accumulates 0.55" (14mm) of precipitation.

Snowfall

In Atlanta snow does not fall in April through November.

Daylight

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

Sunshine

In Atlanta, the average sunshine is 8.7h.

UV index

In September, the average daily maximum UV index in Atlanta is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the temperature in September in Atlanta?

In September, in Atlanta, Georgia, 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. 'real feel', 'apparent temperature'), that represents influence of the relative humidity to air temperaure, is evaluated at 90.9°F (32.7°C).

What is the average humidity in September in Atlanta?

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

How many days does it rain in September in Atlanta?

In Atlanta, in September, during 8.6 rainfall days, 0.55" (14mm) of precipitation is typically accumulated.

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?

In Atlanta, Georgia, snow does not fall in April through November.

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

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

How long on average sun shines in September in Atlanta?

The average sunshine in September in Atlanta, Georgia, is 8.7h.

What is the UV index reading in September in Atlanta?

The average daily maximum UV index in September in Atlanta is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Atlanta, GA

Average temperature in September - Atlanta, GA
  • Average high temperature in September: 29°C

The warmest month (with the highest average high temperature) is July (32.6°C).
The month with the lowest average high temperature is January (10.3°C).

  • Average low temperature in September: 18.6°C

The month with the highest average low temperature is July (22°C).
The coldest month (with the lowest average low temperature) is January (1.6°C).

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Average pressure in September
Atlanta, GA

Average pressure in September - Atlanta, GA
  • Average pressure in September: 1016.8mbar

The month with the highest atmospheric pressure is January (1021.4mbar).
The month with the lowest atmospheric pressure is June (1015.5mbar).

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Average wind speed in September
Atlanta, GA

Average wind speed in September - Atlanta, GA
  • Average wind speed in September: 7.8km/h

The windiest month (with the highest average wind speed) is January (12.9km/h).
The calmest month (with the lowest average wind speed) is August (7.3km/h).

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Average humidity in September
Atlanta, GA

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%).

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Average rainfall in September
Atlanta, GA

Average rainfall in September - Atlanta, GA
  • Average rainfall in September: 14mm

The wettest month (with the highest rainfall) is August (59mm).
The driest month (with the least rainfall) is September (14mm).

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Average rainfall days in September
Atlanta, GA

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).

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Average snowfall in September
Atlanta, GA

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

The month with the highest snowfall is February (5mm).
Months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

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Average snowfall days in September
Atlanta, GA

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).

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Average daylight in September /
Average sunshine in September
Atlanta, GA

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).

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Average sunshine days in September
Atlanta, GA

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).

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Average UV index in September
Atlanta, GA

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).

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Average cloud cover in September
Atlanta, GA

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).

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Average visibility in September
Atlanta, GA

Average visibility in September - Atlanta, GA
  • Average visibility in September: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).

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