S
M
T
W
T
F
S
30
77°
68°
31
84°
72°
1
88°
73°
2
93°
73°
3
91°
70°
4
79°
70°
5
77°
66°
6
77°
63°
7
77°
63°
8
84°
61°
9
86°
70°
10
79°
68°
11
77°
63°
12
79°
64°
13
81°
63°
14
70°
55°
15
86°
57°
16
79°
72°
17
75°
68°
18
73°
64°
19
70°
63°
20
68°
63°
21
70°
61°
22
64°
61°
23
68°
57°
24
68°
55°
25
68°
48°
26
70°
55°
27
72°
52°
28
72°
55°
29
75°
52°
30
73°
57°
1
88°
70°
2
72°
57°
3
68°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Castalia
Castalia'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 Castalia. See also: October | November | December.
