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
The move into September indicates a slight reduction in the average high-temperature, down from August's moderately hot 77°F (25°C) to a pleasant 70.9°F (21.6°C). During September in Old Mill Creek, the average low-temperature is recorded at a mild 58.5°F (14.7°C).Humidity
In Old Mill Creek, the average relative humidity in September is 77%.Rainfall
In Old Mill Creek, Illinois, in September, during 12.7 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, in Old Mill Creek, there are 142.5 rainfall days, and 21.5" (546mm) of precipitation is accumulated.Snowfall
In Old Mill Creek, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:34 pm CDT.
Sunshine
In Old Mill Creek, Illinois, the average sunshine in September is 9.2h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a daily UV index of 4 turns into the following recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Old Mill Creek in September?
What is the average humidity in September in Old Mill Creek?
How much does it rain in Old Mill Creek in September?
When it does not snow in Old Mill Creek?
Does it snow in Old Mill Creek in September?
What is the average length of the day in September in Old Mill Creek?
What time are sunrise and sunset in September in Old Mill Creek?
How many hours of sunshine does Old Mill Creek have in September?
How high is the UV index in September in Old Mill Creek?
Average temperature in September
Old Mill Creek, IL
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in September: 58.5°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in September
Old Mill Creek, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Old Mill Creek, IL
- Average wind speed in September: 8.8mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in September
Old Mill Creek, IL
- Average humidity in September: 77%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in September
Old Mill Creek, IL
- Average rainfall in September: 1.73"
The wettest months (with the highest rainfall) are June and August (2.68").
The driest month (with the least rainfall) is December (0.91").
Average rainfall days in September
Old Mill Creek, IL
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in September
Old Mill Creek, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Old Mill Creek, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Old Mill Creek, IL
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Old Mill Creek, IL
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in September
Old Mill Creek, IL
- Average UV index in September: 4
The months with the highest UV index are 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
Old Mill Creek, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Old Mill Creek, 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).
Old Mill Creek, Illinois, USA
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