S
M
T
W
T
F
S
30
75°
53°
31
74°
52°
1
75°
53°
2
73°
51°
3
73°
51°
4
76°
55°
5
77°
55°
6
72°
56°
7
73°
52°
8
77°
49°
9
72°
56°
10
76°
58°
11
78°
56°
12
79°
55°
13
74°
48°
14
71°
51°
15
69°
47°
16
69°
47°
17
66°
54°
18
71°
50°
19
70°
53°
20
69°
45°
21
73°
44°
22
65°
42°
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 65° to 79°, with overnight lows between 42° and 58°. The average high for September is 73° 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.
