S
M
T
W
T
F
S
30
78°
58°
31
76°
59°
1
76°
64°
2
77°
66°
3
81°
65°
4
84°
66°
5
84°
64°
6
80°
58°
7
78°
58°
8
77°
57°
9
76°
56°
10
74°
55°
11
74°
56°
12
75°
56°
13
77°
61°
14
79°
62°
15
75°
56°
16
73°
58°
17
72°
57°
18
73°
60°
19
75°
53°
20
74°
56°
21
72°
54°
22
77°
52°
23
70°
51°
24
70°
51°
25
71°
56°
26
71°
53°
27
72°
57°
28
71°
57°
29
73°
49°
30
69°
52°
1
67°
57°
2
73°
56°
3
72°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Horsham Heights
Horsham Heights's September 2026 forecast shows daily high temperatures ranging from 67° to 84°, with overnight lows between 49° and 66°. The average high for September is 75° with an average low of 57°. 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 Horsham Heights. See also: October | November | December.
