S
M
T
W
T
F
S
30
97°
76°
31
97°
75°
1
96°
76°
2
97°
76°
3
97°
75°
4
96°
75°
5
96°
74°
6
95°
74°
7
96°
69°
8
90°
69°
9
90°
70°
10
94°
70°
11
94°
71°
12
95°
72°
13
94°
71°
14
93°
72°
15
94°
71°
16
93°
66°
17
88°
66°
18
86°
67°
19
86°
65°
20
88°
63°
21
86°
64°
22
85°
63°
23
84°
64°
24
85°
68°
25
85°
69°
26
86°
69°
27
88°
68°
28
85°
68°
29
88°
67°
30
89°
66°
1
86°
65°
2
87°
59°
3
82°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Westlake
Westlake's September 2026 forecast shows daily high temperatures ranging from 82° to 97°, with overnight lows between 59° and 76°. The average high for September is 91° with an average low of 69°. 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 Westlake. See also: October | November | December.
