September weather forecastWonder Lake, IL
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Wonder Lake, Illinois, with an average temperature varying between 72.3°F (22.4°C) and 55°F (12.8°C).Temperature
Wonder Lake's progression into September involves a minor drop in the average high-temperature, slightly receding from a moderately hot 78.1°F (25.6°C) in August to a pleasant 72.3°F (22.4°C). Wonder Lake's average low-temperature in September is measured at a cool 55°F (12.8°C).Humidity
The average relative humidity in September is 80%.Rainfall
In September, the rain falls for 13.5 days. Throughout September, 2.09" (53mm) of precipitation is accumulated. In Wonder Lake, during the entire year, the rain falls for 152.4 days and collects up to 28.07" (713mm) of precipitation.Snowfall
In Wonder Lake, snow does not fall in June through September.Daylight
In Wonder Lake, Illinois, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:19 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:36 pm CDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 4 during September leads to these advisories:
Take precautions - Protection against sun damage is advised. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. 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
Average temperature in September
Wonder Lake, IL
- Average high temperature in September: 72.3°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (26.6°F).
- Average low temperature in September: 55°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 (14.9°F).
Average pressure in September
Wonder Lake, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Wonder Lake, IL
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Wonder Lake, IL
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is October (76%).
Average rainfall in September
Wonder Lake, IL
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is December (1.34").
Average rainfall days in September
Wonder Lake, IL
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in September
Wonder Lake, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.16").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Wonder Lake, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Wonder Lake, 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 6min).
- Average sunshine in September: 8h and 54min
The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Wonder Lake, IL
- Average sunshine days in September: 14.3 days
The month with the most sunshine days is November (16 days).
The month with the least sunshine days is June (10.2 days).
Average UV index in September
Wonder Lake, IL
- Average UV index in September: 4
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Wonder Lake, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in September
Wonder Lake, IL
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
