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 comes with a small reduction in the average high-temperature, subtly receding from a moderately hot 84.9°F (29.4°C) in August to a still warm 78.1°F (25.6°C). Throughout September, an average low-temperature of 58.6°F (14.8°C) is experienced in Sunny Knoll.Humidity
In September, the average relative humidity in Sunny Knoll is 76%.Rainfall
September is the month with the least rainfall in Sunny Knoll. Rain falls for 13.2 days and accumulates 1.85" (47mm) of precipitation.Snowfall
June through October are months without snowfall.Daylight
In Sunny Knoll, the average length of the day in September is 12h and 25min.On the first day of September in Sunny Knoll, sunrise is at 6:41 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:55 pm EDT.
Sunshine
The average sunshine in September in Sunny Knoll is 8.9h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 4 during September translates into these guidelines:
Guard yourself - Precautionary measures against sun damage are advocated. Around midday, solar radiation is most harmful; hence, exposure should be limited. Boost your sun resistance with garments that are densely woven yet spacious.
Frequently asked questions
What are September temperatures in Sunny Knoll?
What is the average humidity in September in Sunny Knoll?
What is the driest month in Sunny Knoll?
How many days does it rain in September in Sunny Knoll?
When it does not snow in Sunny Knoll?
What is the average length of the day in September in Sunny Knoll?
When are sunrise and sunset in September in Sunny Knoll?
How long on average sun shines in September in Sunny Knoll?
What is the UV index intensity in September in Sunny Knoll?
Average temperature in September
Sunny Knoll, VA
- Average high temperature in September: 78.1°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (40.3°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in September
Sunny Knoll, VA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Sunny Knoll, VA
- Average wind speed in September: 4.9mph
The windiest months (with the highest average wind speed) are March and April (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).
Average humidity in September
Sunny Knoll, VA
- Average humidity in September: 76%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Sunny Knoll, VA
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is August (3.27").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in September
Sunny Knoll, VA
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is November (9.4 days).
Average snowfall in September
Sunny Knoll, VA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.74").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Sunny Knoll, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sunny Knoll, VA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Sunny Knoll, VA
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (11.7 days).
Average UV index in September
Sunny Knoll, VA
- Average UV index in September: 4
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, February, November and December (UV index 2).
Average cloud cover in September
Sunny Knoll, VA
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Sunny Knoll, VA
- Average visibility in September: 5mi
The months with the highest visibility are January, March, April, June, July, August and November (6mi).
The months with the lowest visibility are February, May, September, October and December (5mi).
Sunny Knoll, Virginia, USA
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