S
M
T
W
T
F
S
30
74°
53°
31
73°
51°
1
74°
53°
2
73°
52°
3
73°
49°
4
72°
51°
5
72°
51°
6
73°
50°
7
73°
51°
8
72°
51°
9
72°
50°
10
70°
49°
11
70°
50°
12
71°
50°
13
70°
48°
14
70°
48°
15
68°
49°
16
68°
48°
17
69°
43°
18
68°
49°
19
64°
48°
20
66°
48°
21
69°
49°
22
68°
48°
23
64°
44°
24
65°
48°
25
Hist. Avg.
62°
50°
26
Hist. Avg.
62°
50°
27
Hist. Avg.
62°
49°
28
Hist. Avg.
62°
49°
29
Hist. Avg.
62°
49°
30
Hist. Avg.
61°
49°
1
Hist. Avg.
61°
49°
2
Hist. Avg.
61°
48°
3
Hist. Avg.
61°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Custom House
Custom House's September 2026 forecast shows daily high temperatures ranging from 64° to 74°, with overnight lows between 43° and 53°. 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 Custom House. See also: October | November | December.
