S
M
T
W
T
F
S
30
71°
45°
31
73°
50°
1
74°
48°
2
73°
46°
3
77°
52°
4
74°
51°
5
68°
48°
6
69°
49°
7
73°
48°
8
73°
50°
9
71°
51°
10
70°
49°
11
76°
52°
12
76°
52°
13
77°
48°
14
78°
47°
15
75°
47°
16
74°
46°
17
70°
46°
18
73°
45°
19
74°
46°
20
71°
46°
21
72°
47°
22
73°
48°
23
72°
44°
24
71°
43°
25
70°
42°
26
66°
40°
27
64°
38°
28
60°
38°
29
66°
40°
30
68°
43°
1
66°
35°
2
58°
33°
3
63°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Evanston
Evanston's September 2026 forecast shows daily high temperatures ranging from 58° to 78°, with overnight lows between 33° and 52°. The average high for September is 71° with an average low of 45°. 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.
