S
M
T
W
T
F
S
30
66°
57°
31
67°
57°
1
70°
57°
2
72°
55°
3
72°
57°
4
70°
60°
5
68°
56°
6
68°
56°
7
69°
53°
8
N/A
9
90°
62°
10
77°
58°
11
68°
56°
12
70°
53°
13
74°
51°
14
73°
55°
15
72°
54°
16
70°
53°
17
73°
52°
18
72°
53°
19
72°
54°
20
73°
55°
21
72°
53°
22
72°
54°
23
71°
54°
24
72°
52°
25
69°
53°
26
74°
55°
27
68°
51°
28
70°
49°
29
71°
52°
30
75°
55°
1
76°
56°
2
76°
55°
3
75°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Castroville
Castroville's September 2026 forecast shows daily high temperatures ranging from 68° to 90°, with overnight lows between 49° and 62°. The average high for September is 73° with an average low of 54°. 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 Castroville. See also: October | November | December.
