S
M
T
W
T
F
S
30
88°
72°
31
88°
73°
1
89°
71°
2
89°
69°
3
88°
68°
4
87°
68°
5
87°
69°
6
88°
70°
7
89°
68°
8
88°
70°
9
91°
70°
10
91°
68°
11
90°
68°
12
91°
70°
13
91°
71°
14
90°
70°
15
90°
70°
16
89°
68°
17
88°
69°
18
89°
69°
19
88°
68°
20
87°
68°
21
88°
69°
22
87°
68°
23
86°
67°
24
83°
68°
25
Hist. Avg.
85°
65°
26
Hist. Avg.
85°
64°
27
Hist. Avg.
85°
64°
28
Hist. Avg.
84°
63°
29
Hist. Avg.
84°
63°
30
Hist. Avg.
84°
63°
1
Hist. Avg.
84°
62°
2
Hist. Avg.
83°
62°
3
Hist. Avg.
83°
61°
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 83° to 91°, with overnight lows between 67° and 73°. The average high for September is 88° with an average low of 69°. 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.
