S
M
T
W
T
F
S
30
78°
65°
31
80°
69°
1
88°
69°
2
92°
72°
3
80°
66°
4
79°
65°
5
79°
57°
6
77°
53°
7
78°
51°
8
81°
69°
9
77°
61°
10
76°
50°
11
77°
59°
12
82°
61°
13
79°
58°
14
77°
63°
15
75°
55°
16
72°
54°
17
71°
54°
18
66°
48°
19
66°
48°
20
65°
47°
21
69°
49°
22
66°
54°
23
68°
55°
24
70°
54°
25
75°
54°
26
74°
53°
27
71°
53°
28
74°
55°
29
75°
55°
30
75°
54°
1
74°
52°
2
72°
48°
3
61°
44°
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 61° to 82°, with overnight lows between 44° and 69°. The average high for September is 73° with an average low of 54°. 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.
