S
M
T
W
T
F
S
30
80°
54°
31
81°
51°
1
81°
47°
2
73°
46°
3
70°
46°
4
69°
47°
5
70°
45°
6
71°
52°
7
77°
56°
8
80°
50°
9
77°
46°
10
71°
46°
11
72°
51°
12
73°
45°
13
73°
45°
14
68°
43°
15
68°
47°
16
71°
52°
17
74°
43°
18
68°
46°
19
68°
43°
20
72°
39°
21
66°
43°
22
64°
52°
23
74°
50°
24
75°
48°
25
73°
50°
26
67°
51°
27
74°
48°
28
73°
47°
29
70°
49°
30
70°
49°
1
73°
38°
2
72°
36°
3
60°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grantsburg
Grantsburg's September 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 36° and 56°. The average high for September is 72° with an average low of 47°. 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 Grantsburg. See also: October | November | December.
