September weather forecast
Decatur, GA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Decatur, Georgia, with an average temperature varying between 65.5°F (18.6°C) and 84.2°F (29°C).

Temperature

September's arrival brings an average high-temperature of a warm 84.2°F (29°C), demonstrating subtle variation from the preceding month. Throughout September, the nighttime temperature averages to a refreshing 65.5°F (18.6°C).

Heat index

The average heat index in September is calculated to be a hot 91.4°F (33°C). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', comes about by integrating the temperature readings with the humidity levels. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.

Humidity

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

Rainfall

The month with the least rainfall in Decatur 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 in Decatur.

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of the month, sunrise is at 7:11 am and sunset at 8:02 pm. On the last day of September, in Decatur, sunrise is at 7:31 am and sunset at 7:22 pm EDT.

Sunshine

The average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index in Decatur is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: During September, 5 as the daily maximum UV index converts into the following advice:
Make use of precautions - Shielding skin and eyes from injury is a requirement. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
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Frequently asked questions

How hot does it get in Decatur in September?

An average high-temperature, in September, in Decatur, 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'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 91.4°F (33°C).

What is the average humidity in September in Decatur?

The average relative humidity in September in Decatur is 70%.

What is the driest month in Decatur?

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

How many days does it rain in September in Decatur?

In Decatur, Georgia, in September, it is raining for 8.6 days, with typically 0.55" (14mm) of accumulated precipitation.

When it does not snow in Decatur?

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

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

In September, the average day length is 12h and 22min.

When are sunrise and sunset in September in Decatur?

On the first day of September, sunrise is at 7:11 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:22 pm EDT.

How many hours of sunshine does Decatur have in September?

In Decatur, the average sunshine duration in September is 8.7h.

What is the UV index reading in September in Decatur?

The average daily maximum UV index in September in Decatur is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Decatur, GA

Average temperature in September - Decatur, 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).

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Average pressure in September
Decatur, GA

Average pressure in September - Decatur, GA
  • Average pressure in September: 30.03"Hg

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

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Average wind speed in September
Decatur, GA

Average wind speed in September - Decatur, 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).

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Average humidity in September
Decatur, GA

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

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

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Average rainfall in September
Decatur, GA

Average rainfall in September - Decatur, 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").

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Average rainfall days in September
Decatur, GA

Average rainfall days in September - Decatur, 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
Decatur, GA

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

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

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Average snowfall days in September
Decatur, GA

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

The month with the highest number of snowfall days is February (0.9 days).
The 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
Decatur, GA

Average daylight in September / Average sunshine in September - Decatur, GA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 8h and 4min

The months with the most sunshine are June and July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

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Average sunshine days in September
Decatur, GA

Average sunshine days in September - Decatur, 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
Decatur, GA

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

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

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Average cloud cover in September
Decatur, GA

Average cloud cover in September - Decatur, 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
Decatur, GA

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

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

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Decatur, Georgia, USA

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