September weather forecastCornell, IL
September
Weather in September
September, the first month of the autumn in Cornell, is still a warm month, with an average temperature fluctuating between 57°F (13.9°C) and 75.6°F (24.2°C).Temperature
The start of September sees the average high-temperature at a still moderately hot 75.6°F (24.2°C), showing little difference from August's 80.1°F (26.7°C). Cornell observes an average nighttime low-temperature of 57°F (13.9°C) during the month of September.Humidity
In Cornell, the average relative humidity in September is 76%.Rainfall
In Cornell, in September, it is raining for 10.1 days, with typically 1.06" (27mm) of accumulated precipitation. Throughout the year, there are 125.3 rainfall days, and 15.71" (399mm) of precipitation is accumulated.Snowfall
In Cornell, snow does not fall in May through September.Daylight
In Cornell, the average length of the day in September is 12h and 27min.On the first day of September in Cornell, sunrise is at 6:22 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 September, the average sunshine is 8.9h.UV index
In September, the average daily maximum UV index in Cornell is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Take measures. Individuals with light skin might experience burns in under 30 minutes. To protect against the Sun's most potent rays, avoid direct exposure around midday. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cornell, IL
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.2°F).
- Average low temperature in September: 57°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in September
Cornell, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Cornell, IL
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Cornell, IL
- Average humidity in September: 76%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Cornell, IL
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is May (2.44").
The driest months (with the least rainfall) are January and February (0.71").
Average rainfall days in September
Cornell, IL
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in September
Cornell, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Cornell, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.2 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
Cornell, IL
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 54min
The months with the most sunshine are June and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Cornell, IL
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Cornell, IL
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Cornell, IL
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in September
Cornell, 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).
