S
M
T
W
T
F
S
26
80°
58°
27
79°
58°
28
78°
57°
29
80°
59°
30
79°
59°
31
78°
58°
1
73°
57°
2
74°
58°
3
75°
57°
4
74°
58°
5
74°
58°
6
75°
57°
7
75°
58°
8
73°
59°
9
75°
57°
10
76°
54°
11
77°
52°
12
75°
52°
13
74°
57°
14
75°
54°
15
78°
53°
16
74°
54°
17
73°
57°
18
78°
57°
19
78°
56°
20
77°
53°
21
77°
52°
22
76°
52°
23
72°
53°
24
72°
54°
25
74°
53°
26
75°
54°
27
73°
55°
28
76°
55°
29
75°
54°
30
76°
54°
31
75°
53°
1
74°
49°
2
75°
48°
3
73°
50°
4
71°
53°
5
74°
52°
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 71° to 80°, with overnight lows between 48° and 59°. The average high for August is 75° with an average low of 55°. 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.
