S
M
T
W
T
F
S
30
76°
54°
31
75°
53°
1
74°
49°
2
75°
48°
3
73°
50°
4
71°
53°
5
74°
52°
6
74°
47°
7
73°
47°
8
67°
50°
9
68°
52°
10
70°
53°
11
72°
51°
12
72°
51°
13
71°
50°
14
71°
50°
15
70°
49°
16
70°
48°
17
68°
49°
18
68°
45°
19
66°
44°
20
67°
50°
21
68°
48°
22
67°
43°
23
68°
43°
24
65°
46°
25
65°
47°
26
67°
46°
27
Hist. Avg.
62°
46°
28
Hist. Avg.
62°
46°
29
Hist. Avg.
61°
46°
30
Hist. Avg.
61°
45°
1
Hist. Avg.
61°
45°
2
Hist. Avg.
60°
45°
3
Hist. Avg.
60°
44°
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 65° to 76°, with overnight lows between 43° and 54°. The average high for September is 70° with an average low of 49°. 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.
