September weather forecastHarvel, IL
September
Weather in September
The first month of the autumn, September, is still a warm month in Harvel, Illinois, with an average temperature varying between 77.7°F (25.4°C) and 59°F (15°C).Temperature
The onset of September notes an average high-temperature of a still moderately hot 77.7°F (25.4°C), subtly shifted from August's 82°F (27.8°C). In the month of September, the nighttime temperature dips to a steady average of 59°F (15°C).Humidity
In Harvel, Illinois, the average relative humidity in September is 75%.Rainfall
In Harvel, in September, it is raining for 12.5 days, with typically 1.77" (45mm) of accumulated precipitation. In Harvel, during the entire year, the rain falls for 145.5 days and collects up to 27.44" (697mm) of precipitation.Snowfall
In Harvel, snow does not fall in May through October.Daylight
In Harvel, Illinois, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:41 pm CDT.
Sunshine
In Harvel, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September in Harvel is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 5 during September leads to these advisories:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Harvel, IL
- Average high temperature in September: 77.7°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in September: 59°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in September
Harvel, 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
Harvel, IL
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in September
Harvel, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Harvel, IL
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is June (3.5").
The driest month (with the least rainfall) is February (1.5").
Average rainfall days in September
Harvel, IL
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (7.4 days).
Average snowfall in September
Harvel, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.64").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Harvel, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.4 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
Harvel, 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 18min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in September
Harvel, IL
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (11.1 days).
Average UV index in September
Harvel, 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
Harvel, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July and September (Cloud cover 29).
Average visibility in September
Harvel, 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).
