S
M
T
W
T
F
S
30
88°
66°
31
91°
64°
1
90°
61°
2
86°
64°
3
88°
70°
4
91°
70°
5
82°
66°
6
79°
68°
7
82°
64°
8
82°
64°
9
84°
55°
10
79°
52°
11
84°
63°
12
75°
50°
13
72°
45°
14
61°
43°
15
72°
48°
16
73°
45°
17
72°
57°
18
61°
57°
19
63°
57°
20
70°
49°
21
58°
45°
22
64°
43°
23
63°
49°
24
64°
53°
25
71°
53°
26
72°
55°
27
69°
52°
28
72°
55°
29
69°
50°
30
70°
51°
1
72°
52°
2
66°
44°
3
63°
49°
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 58° to 72°, with overnight lows between 43° and 55°. The average high for September is 67° with an average low of 50°. 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.
