S
M
T
W
T
F
S
30
94°
71°
31
95°
71°
1
95°
72°
2
94°
71°
3
93°
71°
4
93°
73°
5
94°
74°
6
92°
74°
7
91°
73°
8
92°
74°
9
93°
73°
10
92°
74°
11
94°
73°
12
95°
73°
13
95°
72°
14
94°
73°
15
93°
72°
16
88°
72°
17
86°
71°
18
86°
72°
19
87°
71°
20
87°
71°
21
86°
70°
22
86°
71°
23
87°
70°
24
87°
70°
25
88°
69°
26
90°
67°
27
91°
68°
28
89°
67°
29
87°
68°
30
88°
68°
1
87°
67°
2
90°
67°
3
85°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Castle Hills
Castle Hills's September 2026 forecast shows daily high temperatures ranging from 85° to 95°, with overnight lows between 62° and 74°. The average high for September is 90° with an average low of 71°. 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 Castle Hills. See also: October | November | December.
