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
Ashburn's September average high-temperature settles at a warm 84.7°F (29.3°C), showing a near match with the preceding month. Throughout the September nights, Ashburn encounters a low-temperature of 68.2°F (20.1°C).Heat index
September's heat index is appraised at a very hot 95°F (35°C). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.Heat index determinations are made taking into account the shade and light air movements. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', integrates the air's temperature and its humidity to showcase the felt temperature by people. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.
Humidity
The average relative humidity in September is 76%.Rainfall
In Ashburn, during September, the rain falls for 12.8 days and regularly aggregates up to 1.18" (30mm) of precipitation. Throughout the year, there are 145.3 rainfall days, and 20.08" (510mm) of precipitation is accumulated.Snowfall
March through December are months without snowfall.Daylight
In September, the average length of the day is 12h and 21min.On the first day of September, sunrise is at 7:10 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:20 pm EDT.
Sunshine
The average sunshine in September is 8.8h.UV index
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 6 during September leads to these advisories:
Resist extreme sun exposure. Guarding against solar damage is essential. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
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?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Ashburn have in September?
What is the UV index reading in September?
Average temperature in September
Ashburn, GA
- Average high temperature in September: 84.7°F
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (57°F).
- Average low temperature in September: 68.2°F
The month with the highest average low temperature is August (72.9°F).
The coldest month (with the lowest average low temperature) is January (40.6°F).
Average pressure in September
Ashburn, GA
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.98"Hg).
Average wind speed in September
Ashburn, GA
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is February (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in September
Ashburn, GA
- Average humidity in September: 76%
The month with the highest relative humidity is August (77%).
The months with the lowest relative humidity are January, October and November (71%).
Average rainfall in September
Ashburn, GA
- Average rainfall in September: 1.18"
The wettest month (with the highest rainfall) is June (2.36").
The driest month (with the least rainfall) is November (1.06").
Average rainfall days in September
Ashburn, GA
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is July (18.8 days).
The month with the least rainy days is November (6.7 days).
Average snowfall in September
Ashburn, GA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Ashburn, GA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Ashburn, GA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Ashburn, GA
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (21.5 days).
The months with the least sunshine days are July and August (9.8 days).
Average UV index in September
Ashburn, GA
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Ashburn, GA
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 41).
The months with the least cloud cover are May, June and October (Cloud cover 28).
Average visibility in September
Ashburn, 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).
Ashburn, Georgia, USA
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