Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Stone Mountain's entry into September measures an average high-temperature of a warm 84.2°F (29°C), closely parallel to the preceding month. The average low-temperature of 65.3°F (18.5°C) is witnessed during September.Heat index
Throughout September, the heat index is estimated at a hot 91.4°F (33°C). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.Evaluating the heat index requires understanding its values in the shade and with gentle winds. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Humidity
In September, the average relative humidity is 71%.Rainfall
In Stone Mountain, during September, the rain falls for 13.6 days and regularly aggregates up to 2.48" (63mm) of precipitation. Throughout the year, there are 182.9 rainfall days, and 40.39" (1026mm) of precipitation is accumulated.Snowfall
In Stone Mountain, snow does not fall in April through October.Daylight
In Stone Mountain, Georgia, the average length of the day in September is 12h and 22min.On the first day of September in Stone Mountain, sunrise is at 7:10 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 7:21 pm EDT.
Sunshine
In Stone Mountain, Georgia, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Frequently asked questions
How hot is September in Stone Mountain?
What is the average humidity in September in Stone Mountain?
How many days does it rain in September in Stone Mountain?
When it does not snow in Stone Mountain?
What is the average length of the day in September in Stone Mountain?
When are sunrise and sunset in September in Stone Mountain?
How long on average sun shines in September in Stone Mountain?
What is the UV index reading in September in Stone Mountain?
Average temperature in September
Stone Mountain, GA
- Average high temperature in September: 84.2°F
The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (50.5°F).
- Average low temperature in September: 65.3°F
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).
Average pressure in September
Stone Mountain, 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).
Average wind speed in September
Stone Mountain, GA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in September
Stone Mountain, GA
- Average humidity in September: 71%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Stone Mountain, GA
- Average rainfall in September: 2.48"
The wettest month (with the highest rainfall) is August (5.35").
The driest month (with the least rainfall) is October (2.2").
Average rainfall days in September
Stone Mountain, GA
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is July (22.6 days).
The month with the least rainy days is November (9.9 days).
Average snowfall in September
Stone Mountain, GA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Stone Mountain, GA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Stone Mountain, 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 month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in September
Stone Mountain, GA
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is July (6.9 days).
Average UV index in September
Stone Mountain, GA
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Stone Mountain, GA
- Average cloud cover in September: 31
The months with the most cloud cover are February and December (Cloud cover 45).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in September
Stone Mountain, 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).
Stone Mountain, Georgia, USA
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