S
M
T
W
T
F
S
30
73°
52°
31
72°
51°
1
73°
50°
2
71°
49°
3
73°
52°
4
78°
57°
5
78°
53°
6
71°
53°
7
72°
47°
8
70°
48°
9
71°
55°
10
76°
57°
11
76°
51°
12
75°
51°
13
68°
47°
14
68°
46°
15
66°
46°
16
66°
47°
17
65°
51°
18
68°
51°
19
67°
53°
20
72°
45°
21
70°
44°
22
62°
43°
23
74°
52°
24
72°
53°
25
Hist. Avg.
68°
47°
26
Hist. Avg.
68°
46°
27
Hist. Avg.
67°
46°
28
Hist. Avg.
67°
46°
29
Hist. Avg.
66°
45°
30
Hist. Avg.
66°
45°
1
Hist. Avg.
65°
44°
2
Hist. Avg.
65°
44°
3
Hist. Avg.
64°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Green Bay
Green Bay's September 2026 forecast shows daily high temperatures ranging from 62° to 78°, with overnight lows between 43° and 57°. The average high for September is 71° with an average low of 50°. 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 Green Bay. See also: October | November | December.
