S
M
T
W
T
F
S
30
98°
80°
31
91°
81°
1
89°
82°
2
93°
81°
3
90°
81°
4
93°
81°
5
91°
81°
6
88°
79°
7
95°
81°
8
93°
81°
9
91°
81°
10
90°
79°
11
91°
79°
12
95°
81°
13
93°
79°
14
95°
81°
15
97°
81°
16
93°
81°
17
86°
79°
18
91°
79°
19
93°
79°
20
95°
79°
21
93°
81°
22
97°
79°
23
95°
81°
24
93°
81°
25
90°
73°
26
88°
73°
27
93°
77°
28
91°
79°
29
90°
77°
30
93°
80°
1
90°
78°
2
87°
75°
3
86°
75°
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 86° to 93°, with overnight lows between 75° and 80°. The average high for September is 89° with an average low of 77°. 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.
