Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
During September, Oakley observes a subtle ascent to a still warm 76.8°F (24.9°C) from August's 81.1°F (27.3°C) in the average high-temperature. The average nighttime temperature lowers to a moderate 58.5°F (14.7°C) throughout September.Humidity
In September, the average relative humidity in Oakley is 75%.Rainfall
In Oakley, in September, during 12.7 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. In Oakley, during the entire year, the rain falls for 147.7 days and collects up to 24.61" (625mm) of precipitation.Snowfall
In Oakley, 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 September, sunrise is at 6:23 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:38 pm CDT.
Sunshine
In Oakley, Illinois, the average sunshine in September is 9.1h.UV index
In Oakley, Illinois, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Oakley?
What is the average humidity in September in Oakley?
How many days does it rain in September in Oakley?
When it does not snow in Oakley?
How many hours of daylight does Oakley have in September?
When are sunrise and sunset in September in Oakley?
How long on average sun shines in September in Oakley?
What is the UV index reading in September in Oakley?
Average temperature in September
Oakley, IL
- Average high temperature in September: 76.8°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 58.5°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in September
Oakley, 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
Oakley, IL
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in September
Oakley, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Oakley, IL
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is December (1.38").
Average rainfall days in September
Oakley, IL
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (7 days).
Average snowfall in September
Oakley, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.72").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Oakley, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.3 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
Oakley, IL
- Average daylight in September: 12h and 2min
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: 9h and 1min
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 6min).
Average sunshine days in September
Oakley, IL
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in September
Oakley, 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
Oakley, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility in September
Oakley, 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).
Oakley, Illinois, USA
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