September weather forecast
Champaign, IL

An old building that works as an auditorium within the University of Illinois in Champaign
An old building that works as an auditorium within the University of Illinois in Champaign

Weather in September

September, the first month of the autumn, in Champaign, is also a moderately hot month, with average temperature ranging between max 76.1°F (24.5°C) and min 58.3°F (14.6°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still moderately hot 76.1°F (24.5°C). In Champaign, in September, the average low-temperature is 58.3°F (14.6°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

The month with the least rainfall is September when the rain falls for 10.4 days and typically collects 0.94" (24mm) of precipitation.

Snowfall

In Champaign snow does not fall in May through October.

Daylight

In Champaign, the average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine in Champaign, Illinois, is 8.9h.

UV index

In Champaign, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Champaign?

In Champaign, the average relative humidity in September is 76%.

What is the driest month in Champaign?

September is the month with the least rainfall in Champaign, Illinois. Rain falls for 10.4 days and accumulates 0.94" (24mm) of precipitation.

How many days does it rain in September in Champaign?

In September, the rain falls for 10.4 days. Throughout September, 0.94" (24mm) of precipitation is accumulated.

When it does not snow in Champaign?

In Champaign, Illinois, snow does not fall in May through October.

What is the average length of the day in September in Champaign?

The average length of the day in September is 12.4h.

How long on average sun shines in September in Champaign?

The average sunshine in September in Champaign, Illinois, is 8.9h.

How high is the UV index in September in Champaign?

In Champaign, Illinois, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Champaign, IL

Average temperature in September - Champaign, IL
  • Average high temperature in September: 24.5°C

The warmest month (with the highest average high temperature) is July (27.3°C).
The month with the lowest average high temperature is January (-0.1°C).

  • Average low temperature in September: 14.6°C

The month with the highest average low temperature is July (18.4°C).
The coldest month (with the lowest average low temperature) is January (-6.4°C).

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Average pressure in September
Champaign, IL

Average pressure in September - Champaign, IL
  • Average pressure in September: 1016.9mbar

The month with the highest atmospheric pressure is January (1020.7mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).

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Average wind speed in September
Champaign, IL

Average wind speed in September - Champaign, IL
  • Average wind speed in September: 11.8km/h

The windiest month (with the highest average wind speed) is January (17.4km/h).
The calmest month (with the lowest average wind speed) is August (10.2km/h).

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Average humidity in September
Champaign, IL

Average humidity in September - Champaign, 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 (70%).

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Average rainfall in September
Champaign, IL

Average rainfall in September - Champaign, IL
  • Average rainfall in September: 24mm

The wettest month (with the highest rainfall) is April (57mm).
The driest month (with the least rainfall) is September (24mm).

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Average rainfall days in September
Champaign, IL

Average rainfall days in September - Champaign, IL
  • Average rainfall days in September: 10.4 days

The month with the highest number of rainy days is May (15.3 days).
The months with the least rainy days are January and February (6 days).

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Average snowfall in September
Champaign, IL

Average snowfall in September - Champaign, IL
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (47mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in September
Champaign, IL

Average snowfall days in September - Champaign, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Champaign, IL

Average daylight in September / Average sunshine in September - Champaign, IL
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 8.9h

The month with the most sunshine is June (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 4h).

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Average sunshine days in September
Champaign, IL

Average sunshine days in September - Champaign, IL
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.8 days).

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Average UV index in September
Champaign, IL

Average UV index in September - Champaign, 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).

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Average cloud cover in September
Champaign, IL

Average cloud cover in September - Champaign, IL
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are August and September (Cloud cover 31).

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Average visibility in September
Champaign, IL

Average visibility in September - Champaign, IL
  • Average visibility in September: 9km

The months with the highest visibility are October and November (10km).
The months with the lowest visibility are July and August (8km).

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