September weather forecastWilliamsburg, IN
September
Weather in September
September, the first month of the autumn in Williamsburg, is also a moderately hot month, with an average temperature varying between 56.5°F (13.6°C) and 74.1°F (23.4°C).Temperature
The arrival of September denotes a barely perceptible change in the average high-temperatures to a still warm 74.1°F (23.4°C) from August's 79.3°F (26.3°C). The nighttime temperature, during September, averages of 56.5°F (13.6°C).Humidity
The average relative humidity in September is 79%.Rainfall
In Williamsburg, during September, the rain falls for 14.8 days and regularly aggregates up to 2.01" (51mm) of precipitation. Throughout the year, in Williamsburg, there are 172.8 rainfall days, and 32.32" (821mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Williamsburg, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 7:08 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 7:23 pm EDT.
Sunshine
In Williamsburg, the average sunshine in September is 8h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: An average UV index of 4 in September transforms into this advice:
Exercise care. People with light skin might get burns in fewer than 30 minutes. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. 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, IN
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (32.4°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in September
Williamsburg, IN
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January and November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Williamsburg, IN
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in September
Williamsburg, IN
- Average humidity in September: 79%
The months with the highest relative humidity are January, July and December (83%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Williamsburg, IN
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is May (3.94").
The driest month (with the least rainfall) is February (1.97").
Average rainfall days in September
Williamsburg, IN
- Average rainfall days in September: 14.8 days
The month with the highest number of rainy days is May (20.3 days).
The month with the least rainy days is February (9 days).
Average snowfall in September
Williamsburg, IN
- Average snowfall in September: 0"
The month with the highest snowfall is December (3.62").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Williamsburg, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Williamsburg, IN
- 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 24min).
- Average sunshine in September: 8h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Williamsburg, IN
- Average sunshine days in September: 12.3 days
The month with the most sunshine days is November (15.7 days).
The month with the least sunshine days is July (8.9 days).
Average UV index in September
Williamsburg, IN
- Average UV index in September: 4
The months with the highest UV index are May, June and July (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, IN
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Williamsburg, IN
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
