S
M
T
W
T
F
S
30
83°
70°
31
89°
70°
1
96°
73°
2
N/A
3
89°
76°
4
89°
73°
5
80°
70°
6
80°
70°
7
80°
68°
8
85°
71°
9
86°
68°
10
78°
65°
11
75°
62°
12
76°
62°
13
74°
62°
14
75°
61°
15
74°
58°
16
77°
63°
17
76°
62°
18
70°
62°
19
74°
62°
20
75°
61°
21
75°
62°
22
73°
60°
23
70°
60°
24
72°
57°
25
75°
59°
26
75°
54°
27
64°
50°
28
63°
48°
29
64°
50°
30
63°
48°
1
62°
49°
2
65°
56°
3
66°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Evanston
Evanston's September 2026 forecast shows daily high temperatures ranging from 62° to 89°, with overnight lows between 48° and 76°. The average high for September is 74° with an average low of 61°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Evanston. See also: October | November | December.
