S
M
T
W
T
F
S
30
72°
48°
31
75°
46°
1
73°
47°
2
74°
52°
3
74°
47°
4
78°
52°
5
79°
54°
6
77°
53°
7
68°
48°
8
74°
42°
9
75°
42°
10
76°
45°
11
76°
52°
12
81°
49°
13
80°
54°
14
67°
40°
15
74°
39°
16
74°
51°
17
73°
53°
18
65°
48°
19
61°
43°
20
64°
37°
21
70°
38°
22
65°
44°
23
N/A
24
68°
46°
25
73°
48°
26
73°
50°
27
70°
47°
28
59°
39°
29
61°
40°
30
64°
41°
1
70°
44°
2
71°
39°
3
65°
38°
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 59° to 73°, with overnight lows between 38° and 50°. The average high for September is 67° with an average low of 43°. 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.
