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
The start of September sees the average high-temperature at a moderately hot 84°F (28.9°C), showing little difference from August's 89.1°F (31.7°C). September brings with it a nighttime average temperature of 65.1°F (18.4°C).Heat index
September's heat index is appraised at a hot 91.4°F (33°C). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.Keep in mind the heat index values are meant for areas in shade and with light wind. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
Humidity
In Snellville, the average relative humidity in September is 71%.Rainfall
In September, the rain falls for 11.5 days. Throughout September, 1.54" (39mm) of precipitation is accumulated. Throughout the year, in Snellville, Georgia, there are 158.9 rainfall days, and 27.32" (694mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 7:10 am and sunset at 8:01 pm. On the last day of September, sunrise is at 7:30 am and sunset at 7:21 pm EDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 5 translates into these guidelines:
Exercise prevention - Protecting skin and eyes from harm is required. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow in Snellville?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Snellville have in September?
What is the UV index reading in September in Snellville?
Average temperature in September
Snellville, GA
- Average high temperature in September: 84°F
The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (49.8°F).
- Average low temperature in September: 65.1°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 (34.9°F).
Average pressure in September
Snellville, 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
Snellville, GA
- Average wind speed in September: 5mph
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
Snellville, 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
Snellville, GA
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is October (1.46").
Average rainfall days in September
Snellville, GA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is July (18.8 days).
The months with the least rainy days are October and November (9.4 days).
Average snowfall in September
Snellville, GA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.43").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Snellville, GA
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.8 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
Snellville, 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: 9h and 54min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in September
Snellville, GA
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is October (21.1 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in September
Snellville, 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
Snellville, GA
- Average cloud cover in September: 32
The month with the most cloud cover is December (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in September
Snellville, 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).
Snellville, Georgia, USA
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