S
M
T
W
T
F
S
30
92°
73°
31
92°
72°
1
91°
73°
2
91°
73°
3
90°
74°
4
90°
72°
5
92°
73°
6
92°
72°
7
89°
72°
8
89°
72°
9
90°
73°
10
89°
72°
11
90°
73°
12
89°
72°
13
89°
72°
14
90°
71°
15
91°
73°
16
92°
73°
17
90°
72°
18
89°
71°
19
91°
70°
20
92°
73°
21
91°
72°
22
91°
73°
23
90°
72°
24
90°
72°
25
89°
71°
26
90°
70°
27
89°
71°
28
88°
69°
29
87°
70°
30
87°
69°
1
86°
70°
2
87°
70°
3
88°
70°
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 86° to 92°, with overnight lows between 69° and 74°. The average high for September is 90° with an average low of 72°. 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.
