S
M
T
W
T
F
S
30
72°
52°
31
73°
53°
1
72°
52°
2
71°
51°
3
72°
51°
4
72°
52°
5
73°
55°
6
72°
53°
7
71°
53°
8
72°
54°
9
71°
49°
10
70°
48°
11
70°
48°
12
72°
52°
13
71°
49°
14
69°
54°
15
75°
56°
16
76°
56°
17
75°
55°
18
75°
46°
19
73°
45°
20
67°
45°
21
65°
50°
22
67°
52°
23
71°
52°
24
72°
51°
25
71°
42°
26
70°
41°
27
62°
41°
28
61°
42°
29
62°
42°
30
62°
40°
1
Hist. Avg.
66°
43°
2
Hist. Avg.
65°
42°
3
Hist. Avg.
65°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Horicon
Horicon's September 2026 forecast shows daily high temperatures ranging from 61° to 76°, with overnight lows between 40° and 56°. The average high for September is 70° with an average low of 49°. 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 Horicon. See also: October | November | December.
