S
M
T
W
T
F
S
30
81°
52°
31
80°
55°
1
81°
56°
2
82°
57°
3
82°
51°
4
79°
47°
5
77°
53°
6
80°
48°
7
78°
55°
8
79°
56°
9
80°
56°
10
81°
55°
11
81°
55°
12
78°
54°
13
79°
53°
14
78°
51°
15
73°
48°
16
73°
50°
17
71°
46°
18
72°
50°
19
74°
48°
20
71°
49°
21
72°
41°
22
70°
40°
23
68°
43°
24
67°
49°
25
64°
49°
26
70°
50°
27
71°
50°
28
71°
47°
29
72°
41°
30
72°
36°
1
62°
35°
2
58°
35°
3
57°
34°
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 57° to 82°, with overnight lows between 34° and 57°. The average high for September is 74° with an average low of 48°. 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.
