Weather in Illinois in august 2025

The weather in Illinois in the month of august comes from statistical datas on the last years. You can view the weather statistics the entire month, but also by using the tabs for the beginning, the middle and the end of the month.

Average weather throughout august

good weather UV index: 6

Weather at 6am
67°F

Clear/Sunny

32%

Partly Cloudy

15%

Moderate rain at times

11%

Weather at 12pm
81°F

Partly Cloudy

26%

Moderate rain at times

13%

Cloudy

5%

Weather at 6pm
77°F

Partly Cloudy

19%

Moderate rain at times

12%

Cloudy

4%

Weather at 3am
67°F

Clear/Sunny

34%

Fog

32%

Moderate rain at times

15%

Partly Cloudy

14%



Evolution of daily average temperature and precipitation in Illinois in august

These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Illinois in august.


The climate of Illinois in august is good

the weather in Illinois in august is quite dry (with 3.5in of rainfall over 6 days). Unfortunately, the weather conditions is worsening than the previous month since in july there is an average of 4.5in of precipitation over 7 days.

The climate comfortable in that locality this month. Temperatures are up to 83°F. The minimum is 67°F. Thus, the mean temperature average on this month of august in Illinois is 74°F. Note that these seasonal averages are in contrast with those observed in Illinois in the month of august with a maximum record of 95°F in 2010 and a minimum record of 47°F in 2009. You can expect to have about 6 days with temperatures over 86°F, or 19 of time.

On average, in Illinois, the days of august last 13:46. Sunrise is at 05:09 and sunset is at 18:55.

With good weather conditions, this month is a good time to go in that area.



Seasonal average climate and temperature of Illinois in august

Check below seasonal norms These datas are generated from the weather statements of the last years of the month of august.

August
Outside temperature
Average temperature 74°F
Highest temperature 83°F
Lowest temperature 67°F
Highest record temperature 95°F
(2010)
Lowest record temperature 47°F
(2009)
Number of days at +86°F 6 day(s)
(19%)
Number of days at +65°F 31 day(s)
(100%)
Wind
Wind speed 14km/h
Wind temperature 67°F
Precipitation (rainfall)
Rainfall 3.5in
Number of days with rainfall 6 day(s)
(18%)
Record daily rainfall 1.5in
(2009)
Other climate data
Humidity 93%
Visibility 8.46km
Cloud cover 29%
UV index 6
Daily sunshine hours 14
Sunrise and sunset
Time of sunrise 05:09
Time of sunset 18:55
Length of day 13:46
Our opinion about the weather in august
Our opinion at whereandwhen.net good



How was the weather last august?

Here is the day by day recorded weather in Illinois in august 2024:

01-08-2024
Clear/Sunny
76°F to 90°F
02-08-2024
Cloudy
68°F to 77°F
03-08-2024
Clear/Sunny
68°F to 86°F
04-08-2024
Clear/Sunny
68°F to 85°F
05-08-2024
Clear/Sunny
74°F to 88°F
06-08-2024
Clear/Sunny
74°F to 85°F
07-08-2024
Partly Cloudy
67°F to 79°F
08-08-2024
Partly Cloudy
61°F to 76°F
09-08-2024
Clear/Sunny
52°F to 68°F
10-08-2024
Clear/Sunny
52°F to 74°F
11-08-2024
Clear/Sunny
58°F to 79°F
12-08-2024
Heavy rain
59°F to 65°F
13-08-2024
Clear/Sunny
56°F to 77°F
14-08-2024
Clear/Sunny
63°F to 81°F
15-08-2024
Light rain shower
67°F to 85°F
16-08-2024
Clear/Sunny
68°F to 85°F
17-08-2024
Patchy rain nearby
65°F to 74°F
18-08-2024
Patchy rain nearby
63°F to 79°F
19-08-2024
Clear/Sunny
61°F to 79°F
20-08-2024
Partly Cloudy
58°F to 74°F
21-08-2024
Clear/Sunny
52°F to 74°F
22-08-2024
Clear/Sunny
54°F to 76°F
23-08-2024
Clear/Sunny
58°F to 83°F
24-08-2024
Clear/Sunny
72°F to 86°F
25-08-2024
Clear/Sunny
72°F to 81°F
26-08-2024
Clear/Sunny
70°F to 94°F
27-08-2024
Clear/Sunny
76°F to 101°F
28-08-2024
Thundery outbreaks in nearby
74°F to 90°F
29-08-2024
Clear/Sunny
68°F to 92°F
30-08-2024
Clear/Sunny
74°F to 94°F
31-08-2024
Patchy rain nearby
67°F to 85°F

Map: other cities in the United States (USA) in august

Cities near Illinois:

Chicago in augustgood weather
St. Louis (Missouri) in augustgood weather
Indianapolis in augustgood weather
Wisconsin in augustgood weather
Missouri in augustgood weather
Des Moines in augustgood weather
Louisville (Kentucky) in augustgood weather
Cincinnati in augustgood weather
Kansas City in augustgood weather
Nashville in augustgood weather
Detroit in augustgood weather
Minneapolis (Minnesota) in augustperfect weather
United States in august: See full list of cities

Click over cities on the map for information about the weather in august.

Legend: Illinois perfect weather good tolerable bad very bad


Weather data for Illinois in august:

Weather data for Illinois for august are derived from an average of the weather forecast since 2009 in Illinois. There is a margin of error and these forecasts are to be considered as general information only. The weather in Illinois can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Illinois.


Weather in july in Illinois
Weather in september in Illinois
Change units