S
M
T
W
T
F
S
30
82°
55°
31
82°
61°
1
81°
60°
2
81°
53°
3
80°
50°
4
73°
51°
5
73°
56°
6
74°
58°
7
80°
55°
8
76°
51°
9
72°
50°
10
72°
57°
11
72°
58°
12
80°
58°
13
79°
57°
14
80°
56°
15
78°
50°
16
75°
54°
17
70°
47°
18
73°
47°
19
69°
45°
20
67°
43°
21
65°
44°
22
67°
52°
23
68°
45°
24
68°
44°
25
67°
52°
26
70°
51°
27
69°
52°
28
74°
48°
29
73°
44°
30
69°
44°
1
65°
49°
2
71°
48°
3
66°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Owosso
Owosso's September 2026 forecast shows daily high temperatures ranging from 65° to 82°, with overnight lows between 43° and 61°. The average high for September is 73° with an average low of 51°. 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 Owosso. See also: October | November | December.
