September weather forecast and climate
Evanston, IL

Weather in September

The first month of the autumn, September, is also an agreeable month in Evanston, Illinois, with average temperature varying between 70.7°F (21.5°C) and 61.7°F (16.5°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 77°F (25°C) in August, to a pleasant 70.7°F (21.5°C). The average low-temperature, in September, is 61.7°F (16.5°C).

Humidity

In September, the average relative humidity in Evanston is 75%.

Rainfall

In Evanston, it is raining for 14.9 days, with typically 3.11" (79mm) of accumulated precipitation. In Evanston, during the entire year, the rain falls for 154.1 days and collects up to 33.31" (846mm) of precipitation.

Snowfall

In Evanston snow does not fall in May through September.

Daylight

In September, the average length of the day is 12.5h.

Sunshine

The average sunshine in September is 9h.

UV index

In September, the average daily maximum UV index in Evanston is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Evanston?

The average relative humidity in September in Evanston is 75%.

How much does it rain in Evanston in September?

In Evanston, Illinois, in September, it is raining for 14.9 days, with typically 3.11" (79mm) of accumulated precipitation.

When it does not snow in Evanston?

In Evanston, Illinois, snow does not fall in May through September.

Does it snow in Evanston in September?

In Evanston, Illinois, in September, it doesn't snow. In October, it regularly snows.

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

The average length of the day in September in Evanston, Illinois, is 12.5h.

How long on average sun shines in September in Evanston?

In Evanston, Illinois, the average sunshine in September is 9h.

How high is the UV index in September in Evanston?

In September, the average daily maximum UV index in Evanston, Illinois, is 4. A UV Index reading of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Evanston, IL

Average temperature in September - Evanston, IL
  • Average high temperature in September: 70.7°F

The warmest month (with the highest average high temperature) is August (77°F).
The month with the lowest average high temperature is January (29.1°F).

  • Average low temperature in September: 61.7°F

Months with the highest average low temperature are July and August (68°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

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Average pressure in September
Evanston, IL

Average pressure in September - Evanston, IL
  • Average pressure in September: 30.03"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in September
Evanston, IL

Average wind speed in September - Evanston, IL
  • Average wind speed in September: 9.6mph

The windiest month (with the highest average wind speed) is January (12.7mph).
The calmest months (with the lowest average wind speed) are July and August (8mph).

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Average humidity in September
Evanston, IL

Average humidity in September - Evanston, IL
  • Average humidity in September: 75%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in September
Evanston, IL

Average rainfall in September - Evanston, IL
  • Average rainfall in September: 3.11"

The wettest month (with the highest rainfall) is June (4.49").
The driest month (with the least rainfall) is December (1.38").

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Average rainfall days in September
Evanston, IL

Average rainfall days in September - Evanston, IL
  • Average rainfall days in September: 14.9 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (5.6 days).

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Average snowfall in September
Evanston, IL

Average snowfall in September - Evanston, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (3.58").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Evanston, IL

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

The month with the highest number of snowfall days is January (11.6 days).
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
Evanston, IL

Average daylight in September / Average sunshine in September - Evanston, IL
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 9h

Months with the most sunshine are July and August (Average sunshine: 10.6h).
The month with the least sunshine is January (Average sunshine: 3.6h).

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Average sunshine days in September
Evanston, IL

Average sunshine days in September - Evanston, IL
  • Average sunshine days in September: 13 days

The month with the most sunshine days is December (15.3 days).
Months with the least sunshine days are June and July (10.9 days).

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Average UV index in September
Evanston, IL

Average UV index in September - Evanston, IL
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in September
Evanston, IL

Average cloud cover in September - Evanston, IL
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 62).
Months with the least cloud cover are July and August (Cloud cover 27).

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Average visibility in September
Evanston, IL

Average visibility in September - Evanston, IL
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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