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
61°
54°
21
55°
50°
22
66°
46°
23
72°
48°
24
61°
57°
25
68°
59°
26
63°
59°
27
72°
55°
28
70°
54°
29
66°
61°
30
81°
57°
1
66°
43°
2
62°
48°
3
65°
44°
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 62° to 65°, with overnight lows between 44° and 48°. The average high for September is 64° with an average low of 46°. 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.
