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
Williamsburg's September weather features a light decline in high-temperatures, reducing from a warm 80.2°F (26.8°C) in August to a pleasant 72.5°F (22.5°C). Williamsburg experiences a nighttime temperature average of 52.7°F (11.5°C) during September.Humidity
In Williamsburg, Pennsylvania, the average relative humidity in September is 80%.Rainfall
In Williamsburg, Pennsylvania, in September, during 13.5 rainfall days, 1.93" (49mm) of precipitation is typically accumulated. Throughout the year, in Williamsburg, Pennsylvania, there are 176.5 rainfall days, and 29.33" (745mm) of precipitation is accumulated.Snowfall
In Williamsburg, snow does not fall in June through September.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 Williamsburg, the average sunshine in September is 8.5h.UV index
The average daily maximum UV index in September in Williamsburg, Pennsylvania, is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index of 3 during September translates into these guidelines:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Frequently asked questions
What is the temperature in September in Williamsburg?
What is the average humidity in September in Williamsburg?
How much does it rain in Williamsburg in September?
When it does not snow in Williamsburg?
Does it snow in Williamsburg in September?
How many hours of daylight does Williamsburg have in September?
What time are sunrise and sunset in September in Williamsburg?
How long on average sun shines in September in Williamsburg?
How high is the UV index in September in Williamsburg?
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 2min
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 3min
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).
Williamsburg, Pennsylvania, USA
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