S
M
T
W
T
F
S
30
72°
55°
31
72°
57°
1
73°
60°
2
75°
62°
3
78°
62°
4
78°
61°
5
79°
61°
6
78°
60°
7
73°
59°
8
70°
57°
9
73°
59°
10
75°
59°
11
76°
58°
12
78°
59°
13
78°
59°
14
77°
58°
15
75°
58°
16
71°
57°
17
70°
57°
18
74°
56°
19
75°
56°
20
73°
57°
21
75°
52°
22
76°
52°
23
76°
43°
24
72°
46°
25
72°
42°
26
68°
51°
27
68°
53°
28
73°
55°
29
75°
50°
30
72°
40°
1
70°
37°
2
64°
45°
3
65°
43°
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 64° to 79°, with overnight lows between 37° and 62°. The average high for September is 73° with an average low of 54°. 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.
