September weather forecastValmeyer, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Valmeyer, Illinois, with temperature in the range of an average low of 60.3°F (15.7°C) and an average high of 79.5°F (26.4°C).Temperature
With the onset of September, Valmeyer's average high-temperature slightly adjusts, moderately receding from August's 85.1°F (29.5°C) to a still warm 79.5°F (26.4°C). The month of September records an average low-temperature of 60.3°F (15.7°C).Humidity
The average relative humidity in September is 74%.Rainfall
In Valmeyer, in September, during 11.9 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. In Valmeyer, Illinois, during the entire year, the rain falls for 139.8 days and collects up to 25.63" (651mm) of precipitation.Snowfall
January through March, September, November and December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Valmeyer, during the entire year, snow falls for 18.7 days and aggregates up to 6.65" (169mm) of snow.Daylight
In Valmeyer, the average length of the day in September is 12h and 25min.On the first day of September in Valmeyer, sunrise is at 6:31 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:45 pm CDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: An average maximum UV index of 5 in September leads to these recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Valmeyer, IL
- Average high temperature in September: 79.5°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (38.3°F).
- Average low temperature in September: 60.3°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in September
Valmeyer, IL
- 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 (29.92"Hg).
Average wind speed in September
Valmeyer, IL
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Valmeyer, IL
- Average humidity in September: 74%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Valmeyer, IL
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is May (3.19").
The driest months (with the least rainfall) are February and November (1.34").
Average rainfall days in September
Valmeyer, IL
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is July (16.2 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in September
Valmeyer, IL
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (1.89").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in September
Valmeyer, IL
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (6.3 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
Valmeyer, IL
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 30min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Valmeyer, IL
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is January (20.6 days).
The month with the least sunshine days is July (12.5 days).
Average UV index in September
Valmeyer, IL
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Valmeyer, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are June and August (Cloud cover 27).
Average visibility in September
Valmeyer, IL
- 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).
