S
M
T
W
T
F
S
30
80°
62°
31
81°
64°
1
81°
64°
2
80°
63°
3
77°
62°
4
76°
62°
5
79°
64°
6
80°
64°
7
81°
63°
8
79°
64°
9
78°
64°
10
79°
63°
11
77°
64°
12
81°
65°
13
82°
64°
14
83°
63°
15
80°
64°
16
81°
62°
17
81°
62°
18
80°
60°
19
79°
59°
20
73°
62°
21
76°
63°
22
80°
62°
23
78°
61°
24
73°
62°
25
76°
62°
26
80°
61°
27
80°
61°
28
79°
60°
29
75°
59°
30
72°
58°
1
74°
60°
2
75°
60°
3
79°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oceanside
Oceanside's September 2026 forecast shows daily high temperatures ranging from 72° to 83°, with overnight lows between 58° and 65°. The average high for September is 78° with an average low of 62°. 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.
