September weather forecastHerndonville, GA
September
Weather in September
September, the first month of the autumn in Herndonville, is also a moderately hot month, with an average temperature varying between 64.8°F (18.2°C) and 84.4°F (29.1°C).Temperature
Herndonville's average high-temperature in September is a warm 84.4°F (29.1°C), indicating a subtle variation from August. Herndonville's nighttime temperature during September is consistently averaged at an enjoyable 64.8°F (18.2°C).Heat index
The average heat index in September is appraised at a tropical 93.2°F (34°C). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.The standards for the heat index are set for locations in shade and under light breezes. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Humidity
The average relative humidity in September is 73%.Rainfall
In Herndonville, in September, during 13.6 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In Herndonville, during the entire year, the rain falls for 179.3 days and collects up to 39.84" (1012mm) of precipitation.Snowfall
April through November are months without snowfall.Daylight
In Herndonville, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 7:09 am and sunset at 7:59 pm. On the last day of September, sunrise is at 7:28 am and sunset at 7:20 pm EDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
In Herndonville, Georgia, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, an average UV index of 5 transforms into the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. When the Sun is at its strongest around midday, find shade and limit exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Herndonville, GA
- Average high temperature in September: 84.4°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 (51.4°F).
- Average low temperature in September: 64.8°F
The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).
Average pressure in September
Herndonville, GA
- Average pressure in September: 30.02"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
Herndonville, GA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is January (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in September
Herndonville, GA
- Average humidity in September: 73%
The month with the highest relative humidity is December (77%).
The months with the lowest relative humidity are July, October and November (72%).
Average rainfall in September
Herndonville, GA
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is August (4.96").
The driest month (with the least rainfall) is October (2.2").
Average rainfall days in September
Herndonville, GA
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is July (22.3 days).
The month with the least rainy days is October (9.3 days).
Average snowfall in September
Herndonville, GA
- Average snowfall in September: 0"
The months with the highest snowfall are January and December (0.35").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Herndonville, GA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (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
Herndonville, GA
- Average daylight in September: 12h and 24min
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 36min
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 12min).
Average sunshine days in September
Herndonville, GA
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is October (20.2 days).
The month with the least sunshine days is July (7.2 days).
Average UV index in September
Herndonville, GA
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Herndonville, GA
- Average cloud cover in September: 31
The months with the most cloud cover are February and December (Cloud cover 43).
The months with the least cloud cover are June and October (Cloud cover 30).
Average visibility in September
Herndonville, 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).
