S
M
T
W
T
F
S
30
83°
64°
31
80°
64°
1
79°
60°
2
77°
58°
3
78°
56°
4
77°
59°
5
85°
56°
6
89°
70°
7
100°
70°
8
95°
67°
9
92°
68°
10
87°
69°
11
82°
69°
12
80°
65°
13
79°
63°
14
78°
62°
15
79°
67°
16
80°
68°
17
81°
65°
18
82°
65°
19
81°
67°
20
80°
64°
21
73°
52°
22
73°
59°
23
74°
58°
24
73°
57°
25
73°
59°
26
74°
59°
27
72°
58°
28
75°
60°
29
77°
60°
30
79°
61°
1
79°
61°
2
80°
60°
3
80°
59°
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 95°, with overnight lows between 52° and 69°. The average high for September is 79° 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.
