S
M
T
W
T
F
S
30
84°
68°
31
82°
63°
1
82°
55°
2
84°
64°
3
90°
70°
4
84°
64°
5
84°
63°
6
79°
68°
7
81°
66°
8
84°
63°
9
77°
55°
10
81°
48°
11
88°
63°
12
70°
50°
13
68°
46°
14
63°
48°
15
70°
46°
16
72°
45°
17
73°
57°
18
61°
59°
19
61°
57°
20
66°
49°
21
57°
48°
22
61°
47°
23
63°
54°
24
61°
55°
25
67°
57°
26
66°
55°
27
67°
50°
28
66°
49°
29
65°
47°
30
67°
50°
1
68°
50°
2
65°
42°
3
62°
49°
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 68°, with overnight lows between 42° and 57°. The average high for September is 64° with an average low of 50°. 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.
