S
M
T
W
T
F
S
30
72°
48°
31
70°
53°
1
69°
54°
2
72°
48°
3
76°
54°
4
74°
60°
5
77°
56°
6
74°
51°
7
76°
48°
8
79°
55°
9
106°
64°
10
92°
64°
11
77°
58°
12
73°
58°
13
82°
53°
14
83°
53°
15
72°
53°
16
71°
54°
17
74°
52°
18
79°
52°
19
73°
54°
20
68°
56°
21
69°
57°
22
N/A
23
75°
51°
24
73°
53°
25
N/A
26
74°
51°
27
N/A
28
73°
48°
29
77°
48°
30
73°
49°
1
72°
54°
2
76°
52°
3
81°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Arroyo Grande
Arroyo Grande's September 2026 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.
