September weather forecastWilliamsburg, PA
September
Weather in September
September, the first month of the autumn in Williamsburg, is still a pleasant month, with an average temperature fluctuating between 52.7°F (11.5°C) and 72.5°F (22.5°C).Temperature
During the shift to September, Williamsburg records a mild decrease in average high-temperature, moving from a warm 80.2°F (26.8°C) in August to a pleasant 72.5°F (22.5°C). September witnesses an average low-temperature hovering around a cool 52.7°F (11.5°C).Humidity
In September, the average relative humidity is 80%.Rainfall
In Williamsburg, during September, the rain falls for 13.5 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, there are 176.5 rainfall days, and 29.33" (745mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:40 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:56 pm EDT.
Sunshine
In September, the average sunshine is 8.5h.UV index
In September, the average daily maximum UV index in Williamsburg is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the UV index of 3 transforms into the following advice:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Williamsburg, PA
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (31.8°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in September
Williamsburg, PA
- Average pressure in September: 30.06"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
Williamsburg, PA
- Average wind speed in September: 5.1mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Williamsburg, PA
- Average humidity in September: 80%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is July (76%).
Average rainfall in September
Williamsburg, PA
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is November (1.81").
Average rainfall days in September
Williamsburg, PA
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is May (19.3 days).
The months with the least rainy days are February and November (10.8 days).
Average snowfall in September
Williamsburg, PA
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Williamsburg, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Williamsburg, PA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Williamsburg, PA
- Average sunshine days in September: 13.7 days
The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is May (9.3 days).
Average UV index in September
Williamsburg, PA
- Average UV index in September: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Williamsburg, PA
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in September
Williamsburg, PA
- Average visibility in September: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
