S
M
T
W
T
F
S
30
93°
70°
31
93°
71°
1
92°
71°
2
91°
72°
3
90°
72°
4
92°
73°
5
93°
72°
6
92°
71°
7
90°
72°
8
89°
71°
9
90°
72°
10
89°
70°
11
91°
69°
12
91°
71°
13
90°
70°
14
91°
69°
15
91°
71°
16
92°
70°
17
91°
68°
18
90°
70°
19
91°
70°
20
90°
69°
21
89°
69°
22
90°
68°
23
90°
69°
24
89°
67°
25
90°
66°
26
89°
66°
27
88°
68°
28
88°
67°
29
87°
66°
30
88°
66°
1
86°
67°
2
87°
66°
3
88°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Houston
Houston's September 2026 forecast shows daily high temperatures ranging from 86° to 93°, with overnight lows between 66° and 73°. The average high for September is 90° 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 Houston. See also: October | November | December.
