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 still a warm month, with an average temperature fluctuating between 76.1°F (24.5°C) and 58.3°F (14.6°C).

Temperature

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

Humidity

In Champaign, the average relative humidity in September 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

May through October are months without snowfall.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:37 pm CDT.

Sunshine

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

UV index

In Champaign, Illinois, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. 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?

The average relative humidity in September in Champaign, Illinois, 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 much does it rain in Champaign in September?

In Champaign, in September, it is raining for 10.4 days, with typically 0.94" (24mm) of accumulated precipitation.

When it does not snow in Champaign?

May through October are months without snowfall in Champaign.

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

In Champaign, the average day length in September is 12h and 26min.

When is the sunrise / sunset in September in Champaign?

On the first day of September in Champaign, Illinois, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:37 pm CDT.

How long on average sun shines in September in Champaign?

The average sunshine duration in September is 8.9h.

What is the UV index reading in September in Champaign?

The average daily maximum UV index in September in Champaign is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Champaign, IL

Average temperature in September - Champaign, IL
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.8°F).

  • Average low temperature in September: 58.3°F

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

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Average pressure in September
Champaign, IL

Average pressure in September - Champaign, IL
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Champaign, IL

Average wind speed in September - Champaign, IL
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

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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: 0.94"

The wettest month (with the highest rainfall) is April (2.24").
The driest month (with the least rainfall) is September (0.94").

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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: 0"

The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").

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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: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 59min).
The month with the shortest days is December (Average daylight: 9h and 22min).

  • Average sunshine in September: 8h and 54min

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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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: 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).

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