S
M
T
W
T
F
S
30
73°
59°
31
74°
60°
1
73°
59°
2
73°
58°
3
74°
58°
4
74°
59°
5
75°
62°
6
74°
61°
7
72°
61°
8
73°
59°
9
72°
56°
10
73°
55°
11
71°
55°
12
72°
56°
13
72°
56°
14
70°
59°
15
77°
63°
16
78°
63°
17
77°
62°
18
77°
53°
19
75°
52°
20
69°
52°
21
68°
58°
22
69°
60°
23
74°
59°
24
73°
60°
25
74°
50°
26
73°
48°
27
65°
48°
28
63°
49°
29
64°
49°
30
65°
54°
1
64°
55°
2
Hist. Avg.
69°
48°
3
Hist. Avg.
68°
47°
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 63° to 78°, with overnight lows between 48° and 63°. The average high for September is 72° with an average low of 57°. 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.
