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
September heralds a minor drop in average high-temperature, sliding from August's hot 88.3°F (31.3°C) to a warm 81.3°F (27.4°C). Throughout September, the temperature falls to an average low of 61.9°F (16.6°C).Heat index
The heat index value for September is evaluated at a tropical 86°F (30°C). Prolonged activity during exposure might result in a state of fatigue and cause heat cramps.In the scope of the heat index, its values resonate with shade and light wind conditions. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is found by incorporating humidity levels into the air temperature measurement. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
Humidity
The average relative humidity in September is 74%.Rainfall
The month with the least rainfall is September, when the rain falls for 12.1 days and typically collects 1.61" (41mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:48 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:12 am and sunset at 7:01 pm EDT.
Sunshine
In September, the average sunshine is 8.8h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 5 translates into these guidelines:
Exercise prevention - Warding off sunburn is urged. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Keeling have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Keeling have in September?
How high is the UV index in September?
Average temperature in September
Keeling, VA
- Average high temperature in September: 81.3°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 (45.5°F).
- Average low temperature in September: 61.9°F
The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in September
Keeling, VA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Keeling, VA
- Average wind speed in September: 5.1mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in September
Keeling, VA
- Average humidity in September: 74%
The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
Keeling, VA
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in September
Keeling, VA
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is November (9.1 days).
Average snowfall in September
Keeling, VA
- Average snowfall in September: 0"
The months with the highest snowfall are January and December (2.17").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Keeling, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.2 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
Keeling, VA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 8h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Keeling, VA
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (12.4 days).
Average UV index in September
Keeling, VA
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Keeling, VA
- Average cloud cover in September: 37
The months with the most cloud cover are February and March (Cloud cover 42).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in September
Keeling, VA
- 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).
Keeling, Virginia, USA
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