S
M
T
W
T
F
S
30
84°
68°
31
86°
69°
1
93°
71°
2
94°
72°
3
92°
69°
4
88°
69°
5
81°
64°
6
80°
61°
7
82°
61°
8
77°
59°
9
79°
60°
10
82°
61°
11
77°
56°
12
78°
55°
13
77°
58°
14
79°
55°
15
81°
60°
16
81°
60°
17
80°
59°
18
79°
59°
19
81°
58°
20
81°
60°
21
80°
59°
22
81°
59°
23
81°
58°
24
80°
59°
25
81°
58°
26
79°
56°
27
80°
57°
28
79°
57°
29
78°
56°
30
77°
55°
1
77°
54°
2
76°
54°
3
77°
53°
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 76° to 94°, with overnight lows between 53° and 72°. The average high for September is 81° with an average low of 59°. 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.
