S
M
T
W
T
F
S
31
83°
54°
1
81°
54°
2
72°
59°
3
75°
55°
4
71°
55°
5
69°
55°
6
71°
54°
7
75°
47°
8
73°
57°
9
73°
62°
10
74°
60°
11
75°
58°
12
74°
53°
13
76°
55°
14
80°
53°
15
71°
53°
16
68°
49°
17
73°
55°
18
72°
60°
19
72°
59°
20
73°
59°
21
71°
59°
22
74°
57°
23
77°
54°
24
74°
62°
25
73°
62°
26
72°
56°
27
68°
56°
28
69°
63°
29
69°
59°
30
75°
54°
1
74°
56°
2
75°
53°
3
71°
52°
4
77°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Arroyo Grande
Arroyo Grande's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Arroyo Grande. See also: October | November | December.
