S
M
T
W
T
F
S
30
95°
76°
31
90°
79°
1
86°
80°
2
93°
81°
3
91°
81°
4
91°
79°
5
90°
79°
6
90°
79°
7
90°
79°
8
91°
79°
9
90°
79°
10
88°
77°
11
87°
78°
12
93°
79°
13
93°
78°
14
92°
78°
15
91°
79°
16
91°
74°
17
91°
73°
18
90°
71°
19
89°
70°
20
89°
69°
21
88°
69°
22
86°
68°
23
87°
70°
24
88°
67°
25
88°
71°
26
87°
70°
27
83°
71°
28
85°
71°
29
85°
70°
30
88°
70°
1
87°
69°
2
85°
69°
3
84°
70°
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 83° to 93°, with overnight lows between 67° and 79°. The average high for September is 88° with an average low of 72°. 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.
