S
M
T
W
T
F
S
30
93°
72°
31
92°
74°
1
93°
74°
2
93°
73°
3
92°
74°
4
93°
71°
5
93°
73°
6
91°
72°
7
92°
73°
8
89°
72°
9
90°
73°
10
91°
73°
11
91°
72°
12
90°
72°
13
90°
71°
14
91°
72°
15
88°
72°
16
86°
71°
17
87°
71°
18
86°
70°
19
87°
65°
20
85°
66°
21
84°
69°
22
86°
70°
23
88°
70°
24
85°
69°
25
87°
70°
26
88°
69°
27
87°
69°
28
88°
67°
29
86°
67°
30
86°
68°
1
Hist. Avg.
85°
68°
2
Hist. Avg.
85°
67°
3
Hist. Avg.
84°
67°
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 84° to 93°, with overnight lows between 65° and 74°. The average high for September is 89° with an average low of 71°. 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.
