S
M
T
W
T
F
S
30
82°
67°
31
89°
68°
1
88°
65°
2
76°
64°
3
75°
63°
4
77°
62°
5
77°
61°
6
78°
61°
7
74°
56°
8
73°
57°
9
78°
56°
10
73°
54°
11
73°
51°
12
77°
58°
13
76°
58°
14
71°
57°
15
76°
56°
16
75°
55°
17
74°
55°
18
74°
56°
19
75°
56°
20
74°
55°
21
74°
57°
22
75°
56°
23
75°
55°
24
74°
56°
25
74°
55°
26
73°
55°
27
74°
54°
28
74°
53°
29
71°
52°
30
70°
53°
1
71°
53°
2
71°
52°
3
70°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Green Bay
Green Bay's September 2026 forecast shows daily high temperatures ranging from 70° to 88°, with overnight lows between 51° and 65°. The average high for September is 75° with an average low of 56°. 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.
