S
M
T
W
T
F
S
30
82°
60°
31
81°
59°
1
80°
60°
2
81°
62°
3
80°
65°
4
81°
59°
5
82°
60°
6
81°
59°
7
80°
58°
8
79°
57°
9
79°
58°
10
78°
59°
11
79°
56°
12
78°
56°
13
77°
55°
14
78°
56°
15
79°
61°
16
82°
60°
17
80°
54°
18
76°
53°
19
75°
54°
20
75°
58°
21
76°
53°
22
74°
54°
23
79°
57°
24
78°
56°
25
79°
57°
26
78°
49°
27
77°
50°
28
71°
49°
29
70°
49°
30
71°
48°
1
70°
48°
2
Hist. Avg.
74°
53°
3
Hist. Avg.
74°
52°
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 70° to 82°, with overnight lows between 48° and 65°. The average high for September is 78° with an average low of 56°. 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.
