September weather forecastLeaf River, IL
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Leaf River, Illinois, with an average temperature ranging between min 54.5°F (12.5°C) and max 73°F (22.8°C).Temperature
The shift from August to September includes a small decrease in the average high-temperature, from a warm 78.4°F (25.8°C) to an agreeable 73°F (22.8°C). Leaf River's average low-temperature in the month of September is recorded at a cool 54.5°F (12.5°C).Humidity
In Leaf River, the average relative humidity in September is 80%.Rainfall
In September, in Leaf River, Illinois, the rain falls for 12.5 days. Throughout September, 2.44" (62mm) of precipitation is accumulated. Throughout the year, there are 154.8 rainfall days, and 32.36" (822mm) of precipitation is accumulated.Snowfall
In Leaf River, snow does not fall in June through September.Daylight
The average length of the day in September in Leaf River is 12h and 28min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:30 pm. On the last day of September, in Leaf River, sunrise is at 6:54 am and sunset at 6:40 pm CDT.
Sunshine
In Leaf River, the average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: The UV index of 4 during September leads to these advisories:
Put precautions into practice - Protective measures against sun-induced damage are advised. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Leaf River, IL
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in September
Leaf River, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Leaf River, IL
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in September
Leaf River, IL
- Average humidity in September: 80%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in September
Leaf River, IL
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is February (1.57").
Average rainfall days in September
Leaf River, IL
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (19.1 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Leaf River, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.79").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Leaf River, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Leaf River, IL
- Average daylight in September: 12h and 30min
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 12min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Leaf River, IL
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (17 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in September
Leaf River, IL
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Leaf River, IL
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 34).
Average visibility in September
Leaf River, IL
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
