S
M
T
W
T
F
S
26
84°
72°
27
85°
72°
28
85°
71°
29
86°
72°
30
84°
71°
31
83°
70°
1
78°
67°
2
77°
66°
3
77°
70°
4
80°
70°
5
80°
71°
6
83°
71°
7
84°
70°
8
84°
71°
9
83°
71°
10
83°
70°
11
82°
70°
12
84°
71°
13
85°
71°
14
86°
62°
15
83°
63°
16
78°
65°
17
79°
66°
18
83°
64°
19
82°
62°
20
77°
60°
21
75°
60°
22
75°
61°
23
76°
61°
24
76°
62°
25
77°
65°
26
75°
63°
27
82°
62°
28
82°
60°
29
75°
59°
30
73°
59°
31
74°
60°
1
73°
59°
2
73°
58°
3
74°
58°
4
74°
59°
5
75°
62°
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 73° to 86°, with overnight lows between 58° and 72°. The average high for August is 80° 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.
