S
M
T
W
T
F
S
30
70°
56°
31
66°
53°
1
68°
50°
2
73°
59°
3
70°
60°
4
69°
54°
5
71°
53°
6
72°
55°
7
74°
55°
8
74°
57°
9
73°
58°
10
73°
57°
11
75°
56°
12
74°
57°
13
71°
58°
14
72°
54°
15
75°
58°
16
74°
57°
17
75°
57°
18
72°
56°
19
69°
57°
20
74°
57°
21
75°
58°
22
75°
57°
23
72°
57°
24
71°
53°
25
67°
53°
26
68°
54°
27
67°
50°
28
68°
56°
29
72°
57°
30
71°
57°
1
68°
56°
2
73°
57°
3
75°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grover Beach
Grover Beach's September 2026 forecast shows daily high temperatures ranging from 67° to 75°, with overnight lows between 50° and 60°. The average high for September is 72° with an average low of 56°. 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 Grover Beach. See also: October | November | December.
