S
M
T
W
T
F
S
30
67°
54°
31
66°
50°
1
66°
54°
2
67°
54°
3
65°
53°
4
66°
54°
5
63°
52°
6
64°
51°
7
64°
49°
8
62°
54°
9
64°
52°
10
65°
51°
11
62°
52°
12
63°
53°
13
62°
54°
14
61°
53°
15
63°
53°
16
64°
48°
17
65°
52°
18
64°
52°
19
Hist. Avg.
60°
48°
20
Hist. Avg.
60°
48°
21
Hist. Avg.
60°
48°
22
Hist. Avg.
60°
48°
23
Hist. Avg.
59°
48°
24
Hist. Avg.
59°
48°
25
Hist. Avg.
59°
48°
26
Hist. Avg.
59°
48°
27
Hist. Avg.
58°
47°
28
Hist. Avg.
58°
47°
29
Hist. Avg.
58°
47°
30
Hist. Avg.
58°
47°
1
Hist. Avg.
57°
47°
2
Hist. Avg.
57°
47°
3
Hist. Avg.
57°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Seaham
Seaham's September 2026 forecast shows daily high temperatures ranging from 61° to 67°, with overnight lows between 48° and 54°. The average high for September is 64° with an average low of 52°. 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 Seaham. See also: October | November | December.
