S
M
T
W
T
F
S
30
83°
64°
31
83°
63°
1
82°
62°
2
83°
64°
3
84°
64°
4
84°
63°
5
83°
63°
6
83°
62°
7
84°
60°
8
76°
58°
9
79°
59°
10
80°
59°
11
82°
58°
12
75°
57°
13
68°
50°
14
66°
50°
15
66°
55°
16
68°
55°
17
67°
49°
18
78°
45°
19
80°
40°
20
76°
42°
21
64°
41°
22
65°
45°
23
68°
53°
24
71°
53°
25
74°
54°
26
74°
53°
27
73°
47°
28
72°
40°
29
61°
36°
30
58°
36°
1
57°
33°
2
57°
42°
3
59°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Willmar
Willmar's September 2026 forecast shows daily high temperatures ranging from 57° to 84°, with overnight lows between 33° and 64°. The average high for September is 73° with an average low of 52°. 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 Willmar. See also: October | November | December.
