S
M
T
W
T
F
S
30
88°
65°
31
89°
65°
1
87°
64°
2
87°
65°
3
91°
66°
4
91°
69°
5
92°
69°
6
91°
67°
7
86°
67°
8
90°
68°
9
89°
66°
10
89°
66°
11
85°
65°
12
85°
65°
13
88°
64°
14
88°
65°
15
87°
64°
16
88°
64°
17
87°
63°
18
87°
63°
19
84°
62°
20
83°
63°
21
86°
62°
22
86°
63°
23
85°
62°
24
86°
61°
25
85°
61°
26
85°
59°
27
84°
60°
28
85°
61°
29
84°
60°
30
83°
59°
1
82°
57°
2
84°
59°
3
Hist. Avg.
84°
60°
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 82° to 92°, with overnight lows between 57° and 69°. The average high for September is 87° with an average low of 64°. 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.
