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 transition into September involves a small decrease in the average high-temperature, dipping slightly from 85.6°F (29.8°C) in August to a still warm 79.9°F (26.6°C). Throughout September, the nighttime temperature in Grimstead averages to a refreshing 66.6°F (19.2°C).Humidity
In Grimstead, the average relative humidity in September is 75%.Rainfall
September is the month with the least rainfall. Rain falls for 13 days and accumulates 2.4" (61mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:36 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:49 pm EDT.
Sunshine
The average sunshine in September is 9.2h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Undertake precautions - It is suggested to shield oneself from sunburn. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
What is the driest month?
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 Grimstead have in September?
What is the UV index intensity in September?
Average temperature in September
Grimstead, VA
- Average high temperature in September: 79.9°F
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (45.1°F).
- Average low temperature in September: 66.6°F
The month with the highest average low temperature is July (72.3°F).
The coldest month (with the lowest average low temperature) is January (32.5°F).
Average pressure in September
Grimstead, VA
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Grimstead, VA
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
Grimstead, VA
- Average humidity in September: 75%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Grimstead, VA
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is August (3.62").
The driest month (with the least rainfall) is September (2.4").
Average rainfall days in September
Grimstead, VA
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is November (9.6 days).
Average snowfall in September
Grimstead, VA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.34").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Grimstead, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Grimstead, VA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in September
Grimstead, VA
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in September
Grimstead, VA
- Average UV index in September: 5
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 2).
Average cloud cover in September
Grimstead, VA
- Average cloud cover in September: 34
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Grimstead, 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).
Grimstead, Virginia, USA
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