S
M
T
W
T
F
S
30
95°
75°
31
96°
75°
1
93°
74°
2
94°
76°
3
91°
75°
4
92°
74°
5
90°
74°
6
90°
75°
7
93°
75°
8
93°
74°
9
92°
73°
10
94°
75°
11
94°
74°
12
93°
75°
13
93°
74°
14
92°
72°
15
88°
73°
16
89°
73°
17
89°
72°
18
87°
73°
19
88°
73°
20
87°
72°
21
89°
73°
22
88°
72°
23
86°
69°
24
91°
68°
25
86°
68°
26
84°
66°
27
Hist. Avg.
87°
66°
28
Hist. Avg.
86°
66°
29
Hist. Avg.
86°
66°
30
Hist. Avg.
86°
66°
1
Hist. Avg.
86°
65°
2
Hist. Avg.
85°
65°
3
Hist. Avg.
85°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Houston
Houston's September 2026 forecast shows daily high temperatures ranging from 84° to 96°, with overnight lows between 66° and 76°. The average high for September is 91° with an average low of 73°. 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.
