September weather forecastOconee, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Oconee, Illinois, with an average temperature varying between 77.4°F (25.2°C) and 58.8°F (14.9°C).Temperature
September is marked by an average high-temperature of a still moderately hot 77.4°F (25.2°C), almost identical to the preceding month. An average low-temperature of 58.8°F (14.9°C) is anticipated throughout the nights during September.Humidity
The average relative humidity in September in Oconee, Illinois, is 75%.Rainfall
In Oconee, in September, it is raining for 11.5 days, with typically 1.06" (27mm) of accumulated precipitation. In Oconee, Illinois, during the entire year, the rain falls for 129.9 days and collects up to 17.6" (447mm) of precipitation.Snowfall
In Oconee, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:40 pm CDT.
Sunshine
In September, the average sunshine is 9.2h.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 exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 5 during September leads to these instructions:
Exercise prevention - Warding off sunburn is urged. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Oconee, IL
- Average high temperature in September: 77.4°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (34.3°F).
- Average low temperature in September: 58.8°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in September
Oconee, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Oconee, IL
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).
Average humidity in September
Oconee, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Oconee, IL
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is June (2.2").
The driest months (with the least rainfall) are February and December (0.98").
Average rainfall days in September
Oconee, IL
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in September
Oconee, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.93").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Oconee, IL
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (6.3 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
Oconee, IL
- 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 12min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
Oconee, IL
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is January (20.2 days).
The month with the least sunshine days is May (13.1 days).
Average UV index in September
Oconee, IL
- 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
Oconee, IL
- Average cloud cover in September: 29
The months with the most cloud cover are January and February (Cloud cover 54).
The months with the least cloud cover are June and September (Cloud cover 29).
Average visibility in September
Oconee, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
