S
M
T
W
T
F
S
30
77°
58°
31
80°
58°
1
81°
59°
2
81°
58°
3
80°
51°
4
79°
49°
5
72°
53°
6
73°
56°
7
75°
57°
8
77°
57°
9
78°
56°
10
77°
54°
11
76°
52°
12
77°
52°
13
76°
55°
14
76°
56°
15
77°
55°
16
77°
48°
17
75°
54°
18
72°
52°
19
74°
50°
20
72°
45°
21
67°
43°
22
66°
49°
23
66°
46°
24
72°
44°
25
65°
42°
26
64°
42°
27
65°
49°
28
70°
48°
29
71°
44°
30
67°
42°
1
63°
45°
2
63°
39°
3
63°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Seabrook
Seabrook's September 2026 forecast shows daily high temperatures ranging from 63° to 81°, with overnight lows between 39° and 59°. The average high for September is 73° with an average low of 50°. 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 Seabrook. See also: October | November | December.
