September weather forecast
Herndonville, GA

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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.
Updated: Aug 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is September?

An average high-temperature, in September, in Herndonville, is 84.4°F (29.1°C) and the average low-temperature is 64.8°F (18.2°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is appraised at 93.2°F (34°C).

What is the average humidity in September?

The average relative humidity in September is 73%.

How many days does it rain in September?

In September, the rain falls for 13.6 days. Throughout September, 2.24" (57mm) of precipitation is accumulated.

When it does not snow?

April through November are months without snowfall.

How many hours of daylight does Herndonville have in September?

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

What time are sunrise and sunset in September in Herndonville?

In September, on the first day of the month, sunrise is at 7:09 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:20 pm EDT.

How long on average sun shines in September?

In Herndonville, the average sunshine duration in September is 8.6h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
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
Herndonville, GA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in September - Herndonville, 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 12min).

Average sunshine days in September
Herndonville, GA

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 - 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 - 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 - 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).

Herndonville, Georgia, USA

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