S
M
T
W
T
F
S
30
68°
46°
31
73°
46°
1
64°
58°
2
64°
57°
3
64°
54°
4
68°
50°
5
64°
48°
6
66°
54°
7
72°
50°
8
75°
46°
9
79°
46°
10
68°
50°
11
68°
48°
12
61°
50°
13
66°
52°
14
68°
50°
15
66°
48°
16
79°
46°
17
77°
48°
18
66°
48°
19
67°
49°
20
69°
51°
21
70°
51°
22
68°
46°
23
67°
46°
24
65°
46°
25
68°
47°
26
70°
46°
27
69°
45°
28
68°
46°
29
69°
48°
30
68°
44°
1
66°
45°
2
62°
48°
3
62°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bay City
Bay City's September 2026 forecast shows daily high temperatures ranging from 62° to 70°, with overnight lows between 44° and 51°. The average high for September is 67° with an average low of 47°. 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 Bay City. See also: October | November | December.
