S
M
T
W
T
F
S
30
78°
64°
31
81°
68°
1
90°
69°
2
N/A
3
77°
68°
4
74°
61°
5
77°
57°
6
76°
58°
7
78°
60°
8
80°
67°
9
86°
62°
10
78°
56°
11
76°
55°
12
73°
57°
13
78°
59°
14
79°
57°
15
79°
57°
16
78°
51°
17
76°
56°
18
71°
53°
19
77°
57°
20
77°
57°
21
76°
56°
22
74°
55°
23
71°
51°
24
72°
54°
25
75°
55°
26
75°
53°
27
65°
50°
28
63°
47°
29
63°
47°
30
62°
43°
1
61°
45°
2
61°
49°
3
67°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Bay City
Bay City's September 2026 forecast shows daily high temperatures ranging from 61° to 86°, with overnight lows between 43° and 68°. The average high for September is 73° with an average low of 55°. 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.
