S
M
T
W
T
F
S
30
76°
51°
31
75°
50°
1
73°
54°
2
72°
52°
3
74°
52°
4
73°
51°
5
72°
51°
6
71°
52°
7
70°
51°
8
72°
51°
9
73°
50°
10
72°
50°
11
71°
49°
12
71°
49°
13
70°
51°
14
70°
52°
15
74°
54°
16
75°
54°
17
76°
55°
18
76°
53°
19
67°
47°
20
75°
51°
21
66°
44°
22
66°
45°
23
Hist. Avg.
70°
48°
24
Hist. Avg.
70°
48°
25
Hist. Avg.
69°
47°
26
Hist. Avg.
69°
47°
27
Hist. Avg.
68°
46°
28
Hist. Avg.
68°
46°
29
Hist. Avg.
68°
46°
30
Hist. Avg.
67°
45°
1
Hist. Avg.
67°
45°
2
Hist. Avg.
66°
45°
3
Hist. Avg.
66°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in DeForest
DeForest's September 2026 forecast shows daily high temperatures ranging from 66° to 76°, with overnight lows between 44° and 55°. The average high for September is 72° with an average low of 51°. 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 DeForest. See also: October | November | December.
