S
M
T
W
T
F
S
30
77°
66°
31
86°
70°
1
88°
68°
2
82°
68°
3
86°
70°
4
90°
72°
5
81°
68°
6
77°
66°
7
77°
63°
8
75°
64°
9
82°
63°
10
79°
54°
11
79°
55°
12
77°
55°
13
64°
50°
14
66°
50°
15
70°
57°
16
72°
54°
17
72°
64°
18
75°
61°
19
73°
59°
20
66°
57°
21
57°
54°
22
61°
50°
23
68°
46°
24
66°
58°
25
66°
53°
26
61°
56°
27
64°
54°
28
71°
55°
29
69°
57°
30
70°
53°
1
70°
52°
2
67°
51°
3
67°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oelwein
Oelwein's September 2026 forecast shows daily high temperatures ranging from 61° to 71°, with overnight lows between 48° and 58°. The average high for September is 67° 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 Oelwein. See also: October | November | December.
