S
M
T
W
T
F
S
26
93°
72°
27
85°
69°
28
79°
64°
29
80°
60°
30
90°
58°
31
84°
65°
1
72°
67°
2
76°
64°
3
82°
61°
4
88°
64°
5
82°
69°
6
80°
67°
7
89°
67°
8
87°
66°
9
83°
62°
10
86°
71°
11
83°
71°
12
84°
70°
13
78°
67°
14
79°
68°
15
77°
72°
16
88°
71°
17
80°
64°
18
83°
63°
19
81°
63°
20
80°
60°
21
82°
59°
22
81°
63°
23
75°
63°
24
75°
65°
25
78°
68°
26
80°
66°
27
77°
66°
28
76°
67°
29
80°
64°
30
79°
65°
31
81°
66°
1
76°
62°
2
75°
63°
3
74°
62°
4
72°
66°
5
72°
63°
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 72° to 81°, with overnight lows between 62° and 68°. The average high for August is 77° with an average low of 65°. 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.
