S
M
T
W
T
F
S
26
85°
70°
27
83°
70°
28
82°
69°
29
82°
70°
30
83°
71°
31
86°
71°
1
84°
70°
2
85°
71°
3
89°
67°
4
82°
64°
5
83°
67°
6
84°
65°
7
83°
64°
8
84°
63°
9
83°
63°
10
83°
64°
11
86°
71°
12
88°
71°
13
89°
68°
14
88°
67°
15
83°
69°
16
82°
69°
17
86°
63°
18
83°
66°
19
82°
63°
20
83°
63°
21
84°
65°
22
87°
69°
23
88°
68°
24
87°
68°
25
88°
66°
26
89°
67°
27
88°
68°
28
87°
69°
29
87°
68°
30
84°
61°
31
83°
59°
1
80°
59°
2
80°
60°
3
81°
61°
4
81°
63°
5
86°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Evanston
Evanston's August 2026 forecast shows daily high temperatures ranging from 80° to 89°, with overnight lows between 59° and 71°. The average high for August is 85° with an average low of 66°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Evanston. See also: September | October | November.
