S
M
T
W
T
F
S
30
68°
46°
31
73°
46°
1
64°
58°
2
64°
57°
3
64°
54°
4
68°
50°
5
64°
48°
6
66°
54°
7
N/A
8
76°
47°
9
77°
56°
10
70°
48°
11
67°
52°
12
63°
46°
13
69°
47°
14
73°
48°
15
70°
52°
16
71°
50°
17
71°
50°
18
70°
51°
19
71°
52°
20
69°
52°
21
68°
46°
22
63°
46°
23
64°
45°
24
63°
45°
25
64°
49°
26
62°
48°
27
62°
45°
28
63°
43°
29
61°
41°
30
62°
43°
1
69°
48°
2
70°
47°
3
70°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Oceanside
Oceanside's September 2026 forecast shows daily high temperatures ranging from 61° to 77°, with overnight lows between 41° and 56°. The average high for September is 68° with an average low of 48°. 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 Oceanside. See also: October | November | December.
