September weather forecastWilliamsburg, MO
September
Weather in September
September, the first month of the autumn in Williamsburg, is still a warm month, with temperature in the range of an average low of 59°F (15°C) and an average high of 79.3°F (26.3°C).Temperature
In Williamsburg, the beginning of September is marked by a marginally lowered average high-temperature, shifting from August's warm 85.6°F (29.8°C) to a still moderately hot 79.3°F (26.3°C). In Williamsburg, September nights cool down to an average of 59°F (15°C).Humidity
The average relative humidity in September in Williamsburg is 74%.Rainfall
In Williamsburg, in September, it is raining for 11.5 days, with typically 1.97" (50mm) of accumulated precipitation. Throughout the year, in Williamsburg, there are 139.9 rainfall days, and 28.19" (716mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall in Williamsburg.Daylight
In Williamsburg, Missouri, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:50 pm CDT.
Sunshine
The average sunshine in September in Williamsburg is 9.3h.UV index
In September, the average daily maximum UV index in Williamsburg, Missouri, is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The UV index of 5 in September translates into these instructions:
Exercise prevention - Precautions against solar damage are endorsed. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Williamsburg, MO
- Average high temperature in September: 79.3°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (37°F).
- Average low temperature in September: 59°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23°F).
Average pressure in September
Williamsburg, MO
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Williamsburg, MO
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in September
Williamsburg, MO
- Average humidity in September: 74%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Williamsburg, MO
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days in September
Williamsburg, MO
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (6 days).
Average snowfall in September
Williamsburg, MO
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Williamsburg, MO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.6 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, MO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 18min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in September
Williamsburg, MO
- Average sunshine days in September: 16.7 days
The month with the most sunshine days is January (20.5 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in September
Williamsburg, MO
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Williamsburg, MO
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are June, July and August (Cloud cover 29).
Average visibility in September
Williamsburg, MO
- 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).
