S
M
T
W
T
F
S
30
72°
55°
31
74°
54°
1
73°
53°
2
71°
53°
3
74°
54°
4
73°
52°
5
74°
56°
6
72°
55°
7
70°
52°
8
72°
55°
9
73°
50°
10
70°
49°
11
73°
50°
12
75°
55°
13
71°
52°
14
69°
54°
15
75°
57°
16
77°
57°
17
75°
56°
18
76°
47°
19
73°
46°
20
67°
46°
21
65°
50°
22
66°
53°
23
71°
53°
24
66°
52°
25
66°
44°
26
67°
43°
27
63°
44°
28
61°
43°
29
62°
44°
30
61°
42°
1
Hist. Avg.
66°
46°
2
Hist. Avg.
65°
45°
3
Hist. Avg.
65°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oshkosh
Oshkosh's September 2026 forecast shows daily high temperatures ranging from 61° to 77°, with overnight lows between 42° and 57°. The average high for September is 70° 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 Oshkosh. See also: October | November | December.
