S
M
T
W
T
F
S
26
71°
57°
27
73°
58°
28
72°
58°
29
72°
57°
30
73°
58°
31
73°
59°
1
72°
58°
2
74°
59°
3
73°
58°
4
72°
58°
5
73°
57°
6
73°
58°
7
72°
58°
8
73°
57°
9
74°
59°
10
74°
59°
11
73°
58°
12
74°
59°
13
74°
58°
14
73°
58°
15
75°
57°
16
73°
57°
17
74°
55°
18
74°
57°
19
73°
56°
20
73°
57°
21
74°
57°
22
74°
56°
23
73°
58°
24
75°
58°
25
76°
57°
26
75°
57°
27
75°
56°
28
74°
57°
29
75°
54°
30
71°
54°
31
69°
57°
1
74°
57°
2
75°
56°
3
74°
55°
4
70°
54°
5
69°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Grover Beach
Grover Beach's August 2026 forecast shows daily high temperatures ranging from 69° to 76°, with overnight lows between 53° and 59°. The average high for August is 73° with an average low of 57°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Grover Beach. See also: September | October | November.
