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 subtly indicates a reduction in the average high-temperature, down to a moderately hot 79.9°F (26.6°C) from August's tropical 86.5°F (30.3°C). The average low-temperature, in September, is a comfortable 65.1°F (18.4°C).Humidity
In September, the average relative humidity is 76%.Rainfall
In Jamestown, Virginia, during September, the rain falls for 12.7 days and regularly aggregates up to 1.57" (40mm) of precipitation. In Jamestown, during the entire year, the rain falls for 148.7 days and collects up to 20.35" (517mm) of precipitation.Snowfall
In Jamestown, snow does not fall in April through October.Daylight
The average length of the day in September in Jamestown is 12h and 25min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:51 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 estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: A maximum UV index of 5 in September translates into the following recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow in Jamestown?
How many hours of daylight does Jamestown have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Jamestown, VA
- Average high temperature in September: 79.9°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (45.1°F).
- Average low temperature in September: 65.1°F
The month with the highest average low temperature is July (71.1°F).
The coldest month (with the lowest average low temperature) is January (31.5°F).
Average pressure in September
Jamestown, VA
- Average pressure in September: 30.04"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
Jamestown, VA
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in September
Jamestown, 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 (73%).
Average rainfall in September
Jamestown, VA
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is August (2.36").
The driest months (with the least rainfall) are October and December (1.38").
Average rainfall days in September
Jamestown, VA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is August (16.3 days).
The month with the least rainy days is November (8.5 days).
Average snowfall in September
Jamestown, VA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.87").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Jamestown, VA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (3.1 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Jamestown, 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 42min).
- 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 18min).
Average sunshine days in September
Jamestown, VA
- Average sunshine days in September: 14.7 days
The months with the most sunshine days are October and November (19.7 days).
The month with the least sunshine days is August (12.2 days).
Average UV index in September
Jamestown, VA
- Average UV index in September: 5
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Jamestown, 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
Jamestown, 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).
Jamestown, Virginia, USA
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