S
M
T
W
T
F
S
30
69°
51°
31
75°
50°
1
68°
57°
2
64°
56°
3
65°
54°
4
70°
51°
5
68°
50°
6
69°
50°
7
68°
52°
8
73°
48°
9
77°
49°
10
66°
51°
11
66°
50°
12
61°
53°
13
65°
53°
14
64°
51°
15
64°
49°
16
75°
50°
17
73°
55°
18
65°
53°
19
67°
49°
20
70°
54°
21
66°
54°
22
65°
51°
23
66°
50°
24
66°
52°
25
67°
52°
26
68°
53°
27
60°
46°
28
61°
48°
29
62°
46°
30
60°
46°
1
60°
44°
2
61°
44°
3
60°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Seaside
Seaside's September 2026 forecast shows daily high temperatures ranging from 60° to 75°, with overnight lows between 43° and 55°. The average high for September is 65° 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 Seaside. See also: October | November | December.
