August weather forecast
Evanston, IL

Weather in August

August, the last month of the summer in Evanston, is also a moderately hot month, with an average temperature ranging between max 77°F (25°C) and min 68°F (20°C).

Temperature

The warmest month is August, with an average high-temperature of 77°F (25°C) and an average low-temperature of 68°F (20°C).

Humidity

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

Rainfall

In Evanston, during 15.8 rainfall days, 3.54" (90mm) of precipitation is typically accumulated. In Evanston, during the entire year, the rain falls for 154.1 days and collects up to 33.31" (846mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In Evanston, Illinois, the average length of the day in August is 13h and 49min.
On the first day of the month, sunrise is at 5:44 am and sunset at 8:09 pm. On the last day of August, in Evanston, sunrise is at 6:15 am and sunset at 7:26 pm CDT.

Sunshine

July and August, with an average of 10.6h of sunshine, are months with the most sunshine in Evanston, Illinois.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the warmest month in Evanston?

The warmest month in Evanston, Illinois, is August, with an average high-temperature of 77°F (25°C) and an average low-temperature of 68°F (20°C).

What is the average humidity in August in Evanston?

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

How many days does it rain in August in Evanston?

In Evanston, Illinois, in August, it is raining for 15.8 days, with typically 3.54" (90mm) of accumulated precipitation.

When it does not snow in Evanston?

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

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

In August, the average day length is 13h and 49min.

When are sunrise and sunset in August in Evanston?

In August, on the first day of the month, sunrise is at 5:44 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 6:15 am and sunset at 7:26 pm CDT.

What is the month with the most sunshine in Evanston?

The months with the most sunshine are July and August, with an average of 10.6h of sunshine.

How many hours of sunshine does Evanston have in August?

In Evanston, the average sunshine duration in August is 10.6h.

When is the highest UV index in Evanston?

June through August, with an average maximum UV index of 6, are months with the highest UV index in Evanston.

What is the UV index reading in August in Evanston?

The average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Evanston, IL

Average temperature in August - Evanston, IL
  • Average high temperature in August: 77°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 August: 68°F

The 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 August
Evanston, IL

Average pressure in August - Evanston, IL
  • Average pressure in August: 29.98"Hg

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

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Average wind speed in August
Evanston, IL

Average wind speed in August - Evanston, IL
  • Average wind speed in August: 8mph

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 August
Evanston, IL

Average humidity in August - Evanston, IL
  • Average humidity in August: 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 August
Evanston, IL

Average rainfall in August - Evanston, IL
  • Average rainfall in August: 3.54"

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 August
Evanston, IL

Average rainfall days in August - Evanston, IL
  • Average rainfall days in August: 15.8 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 August
Evanston, IL

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

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

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Average snowfall days in August
Evanston, IL

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

The month with the highest number of snowfall days is January (11.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Evanston, IL

Average daylight in August / Average sunshine in August - Evanston, IL
  • Average daylight in August: 13h and 49min

The month with the longest days is June (Average daylight: 15h and 11min).
The month with the shortest days is December (Average daylight: 9h and 10min).

  • Average sunshine in August: 10h and 36min

The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

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Average sunshine days in August
Evanston, IL

Average sunshine days in August - Evanston, IL
  • Average sunshine days in August: 12.6 days

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

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Average UV index in August
Evanston, IL

Average UV index in August - Evanston, IL
  • Average UV index in August: 6

The 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 August
Evanston, IL

Average cloud cover in August - Evanston, IL
  • Average cloud cover in August: 27

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

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Average visibility in August
Evanston, IL

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

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

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