S
M
T
W
T
F
S
30
72°
41°
31
77°
45°
1
80°
44°
2
77°
47°
3
80°
48°
4
79°
45°
5
78°
40°
6
74°
44°
7
75°
43°
8
77°
46°
9
78°
47°
10
79°
45°
11
78°
43°
12
76°
46°
13
77°
45°
14
76°
45°
15
75°
43°
16
76°
38°
17
66°
34°
18
64°
37°
19
62°
31°
20
67°
40°
21
69°
34°
22
Hist. Avg.
68°
37°
23
Hist. Avg.
67°
36°
24
Hist. Avg.
67°
36°
25
Hist. Avg.
66°
36°
26
Hist. Avg.
66°
35°
27
Hist. Avg.
65°
35°
28
Hist. Avg.
65°
35°
29
Hist. Avg.
64°
34°
30
Hist. Avg.
64°
34°
1
Hist. Avg.
63°
34°
2
Hist. Avg.
62°
33°
3
Hist. Avg.
62°
33°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Halfmoon
Halfmoon's September 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 31° and 48°. The average high for September is 74° with an average low of 42°. 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 Halfmoon. See also: October | November | December.
