S
M
T
W
T
F
S
30
81°
62°
31
76°
62°
1
78°
61°
2
82°
58°
3
81°
52°
4
73°
54°
5
73°
61°
6
79°
56°
7
78°
52°
8
72°
55°
9
71°
56°
10
72°
60°
11
74°
59°
12
79°
60°
13
79°
59°
14
78°
54°
15
78°
51°
16
69°
53°
17
69°
49°
18
70°
48°
19
68°
45°
20
67°
45°
21
66°
47°
22
67°
54°
23
68°
47°
24
69°
53°
25
72°
54°
26
69°
53°
27
74°
54°
28
74°
50°
29
73°
48°
30
67°
49°
1
66°
50°
2
71°
51°
3
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Half Day
Half Day's September 2026 forecast shows daily high temperatures ranging from 66° to 82°, with overnight lows between 45° and 62°. The average high for September is 73° with an average low of 54°. 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 Half Day. See also: October | November | December.
