S
M
T
W
T
F
S
26
75°
59°
27
75°
58°
28
74°
59°
29
75°
59°
30
75°
58°
31
74°
59°
1
74°
58°
2
75°
59°
3
75°
59°
4
74°
58°
5
74°
59°
6
72°
59°
7
74°
58°
8
75°
59°
9
75°
59°
10
74°
58°
11
73°
57°
12
70°
57°
13
69°
56°
14
70°
56°
15
72°
58°
16
74°
57°
17
71°
53°
18
71°
52°
19
72°
55°
20
71°
56°
21
73°
56°
22
72°
58°
23
71°
55°
24
71°
54°
25
72°
53°
26
70°
53°
27
71°
52°
28
71°
52°
29
72°
50°
30
71°
51°
31
73°
51°
1
71°
50°
2
71°
50°
3
70°
51°
4
70°
51°
5
71°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Arroyo Grande
Arroyo Grande's August 2026 forecast shows daily high temperatures ranging from 69° to 75°, with overnight lows between 50° and 59°. The average high for August 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 August weather will actually feel in Arroyo Grande. See also: September | October | November.
