S
M
T
W
T
F
S
26
91°
65°
27
90°
62°
28
87°
60°
29
87°
60°
30
89°
62°
31
89°
61°
1
93°
62°
2
92°
58°
3
90°
57°
4
90°
58°
5
87°
59°
6
86°
56°
7
84°
57°
8
92°
54°
9
85°
57°
10
84°
57°
11
83°
56°
12
83°
56°
13
82°
55°
14
84°
56°
15
82°
55°
16
83°
56°
17
83°
55°
18
80°
55°
19
82°
54°
20
83°
54°
21
83°
56°
22
78°
53°
23
80°
54°
24
76°
52°
25
73°
51°
26
72°
45°
27
72°
49°
28
73°
48°
29
71°
49°
30
71°
45°
31
73°
51°
1
74°
46°
2
71°
48°
3
71°
44°
4
70°
44°
5
70°
46°
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 70° to 93°, with overnight lows between 44° and 65°. The average high for August is 81° with an average low of 54°. 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.
