S
M
T
W
T
F
S
30
71°
54°
31
69°
57°
1
74°
57°
2
75°
56°
3
74°
55°
4
70°
54°
5
69°
53°
6
70°
52°
7
69°
50°
8
68°
51°
9
69°
52°
10
73°
54°
11
75°
55°
12
75°
54°
13
76°
55°
14
76°
52°
15
74°
51°
16
71°
51°
17
72°
56°
18
75°
55°
19
76°
56°
20
76°
56°
21
75°
57°
22
71°
56°
23
72°
52°
24
69°
51°
25
68°
50°
26
69°
51°
27
68°
51°
28
70°
50°
29
73°
51°
30
72°
54°
1
70°
55°
2
Hist. Avg.
72°
54°
3
Hist. Avg.
72°
54°
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 68° to 76°, with overnight lows between 50° and 57°. The average high for September is 72° with an average low of 53°. 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.
