S
M
T
W
T
F
S
30
95°
78°
31
96°
77°
1
96°
77°
2
95°
78°
3
96°
75°
4
95°
76°
5
95°
77°
6
94°
77°
7
94°
74°
8
90°
74°
9
89°
73°
10
91°
73°
11
93°
75°
12
93°
75°
13
94°
73°
14
93°
74°
15
90°
73°
16
91°
72°
17
91°
72°
18
87°
74°
19
87°
68°
20
88°
67°
21
86°
67°
22
83°
66°
23
85°
67°
24
86°
71°
25
85°
71°
26
87°
70°
27
89°
71°
28
89°
72°
29
88°
72°
30
89°
70°
1
90°
71°
2
89°
64°
3
83°
65°
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 83° to 96°, with overnight lows between 64° and 78°. The average high for September is 90° with an average low of 72°. 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.
