S
M
T
W
T
F
S
30
95°
71°
31
94°
74°
1
94°
74°
2
93°
73°
3
94°
73°
4
94°
70°
5
93°
71°
6
92°
72°
7
93°
73°
8
90°
72°
9
91°
73°
10
92°
72°
11
92°
72°
12
91°
71°
13
91°
71°
14
92°
70°
15
89°
71°
16
87°
71°
17
88°
70°
18
87°
70°
19
87°
64°
20
85°
64°
21
85°
68°
22
87°
69°
23
89°
69°
24
86°
68°
25
88°
69°
26
88°
68°
27
88°
68°
28
89°
66°
29
87°
66°
30
87°
66°
1
87°
68°
2
Hist. Avg.
87°
66°
3
Hist. Avg.
87°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lake Houston
Lake Houston's September 2026 forecast shows daily high temperatures ranging from 85° to 95°, with overnight lows between 64° and 74°. The average high for September is 90° with an average low of 70°. 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 Lake Houston. See also: October | November | December.
