S
M
T
W
T
F
S
30
84°
61°
31
83°
59°
1
80°
59°
2
80°
60°
3
81°
61°
4
81°
63°
5
86°
65°
6
81°
66°
7
85°
63°
8
82°
58°
9
78°
58°
10
78°
57°
11
79°
57°
12
78°
59°
13
77°
58°
14
76°
57°
15
77°
58°
16
78°
60°
17
77°
57°
18
79°
60°
19
81°
61°
20
80°
60°
21
Hist. Avg.
76°
54°
22
Hist. Avg.
76°
54°
23
Hist. Avg.
75°
54°
24
Hist. Avg.
75°
53°
25
Hist. Avg.
75°
53°
26
Hist. Avg.
74°
52°
27
Hist. Avg.
74°
52°
28
Hist. Avg.
74°
51°
29
Hist. Avg.
73°
51°
30
Hist. Avg.
73°
50°
1
Hist. Avg.
72°
50°
2
Hist. Avg.
72°
50°
3
Hist. Avg.
72°
49°
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 76° to 86°, with overnight lows between 57° and 66°. The average high for September is 80° with an average low of 60°. 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.
