September weather forecastCullom, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Cullom, Illinois, with an average temperature ranging between min 57°F (13.9°C) and max 74.8°F (23.8°C).Temperature
September's advent presents an average high-temperature of a still moderately hot 74.8°F (23.8°C), indicating a slight variation from the conditions of the previous month. In Cullom, in September, the average low-temperature is a moderate 57°F (13.9°C).Humidity
The average relative humidity in September in Cullom is 77%.Rainfall
In Cullom, in September, during 9.9 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. In Cullom, during the entire year, the rain falls for 117.5 days and collects up to 13.74" (349mm) of precipitation.Snowfall
In Cullom, snow does not fall in May through September.Daylight
The average length of the day in September in Cullom, Illinois, is 12h and 27min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:36 pm CDT.
Sunshine
The average sunshine in September is 8.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cullom, IL
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in September: 57°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in September
Cullom, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Cullom, IL
- Average wind speed in September: 7.3mph
The windiest months (with the highest average wind speed) are January and April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Cullom, IL
- Average humidity in September: 77%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Cullom, IL
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is May (2.09").
The driest months (with the least rainfall) are February and November (0.63").
Average rainfall days in September
Cullom, IL
- Average rainfall days in September: 9.9 days
The months with the highest number of rainy days are May and July (14.8 days).
The month with the least rainy days is February (3.7 days).
Average snowfall in September
Cullom, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.26").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Cullom, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.9 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
Cullom, IL
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Cullom, IL
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in September
Cullom, IL
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Cullom, IL
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility in September
Cullom, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
