S
M
T
W
T
F
S
30
66°
47°
31
64°
56°
1
66°
56°
2
70°
52°
3
67°
59°
4
72°
57°
5
72°
54°
6
71°
53°
7
71°
49°
8
78°
56°
9
89°
65°
10
80°
62°
11
71°
58°
12
67°
55°
13
69°
54°
14
71°
58°
15
66°
57°
16
68°
59°
17
70°
58°
18
72°
58°
19
71°
59°
20
72°
57°
21
71°
58°
22
72°
56°
23
71°
59°
24
73°
60°
25
71°
59°
26
75°
60°
27
74°
59°
28
74°
59°
29
73°
58°
30
75°
60°
1
75°
60°
2
74°
61°
3
76°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Los Osos
Los Osos's September 2026 forecast shows daily high temperatures ranging from 66° to 89°, with overnight lows between 54° and 65°. The average high for September is 73° with an average low of 59°. 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 Los Osos. See also: October | November | December.
