S
M
T
W
T
F
S
30
98°
76°
31
95°
76°
1
89°
77°
2
88°
76°
3
87°
76°
4
92°
76°
5
94°
77°
6
94°
76°
7
94°
77°
8
96°
76°
9
93°
77°
10
94°
74°
11
94°
74°
12
91°
76°
13
92°
73°
14
84°
74°
15
88°
74°
16
91°
73°
17
92°
74°
18
91°
74°
19
89°
73°
20
89°
73°
21
84°
72°
22
84°
73°
23
85°
72°
24
85°
72°
25
86°
71°
26
88°
70°
27
90°
71°
28
91°
66°
29
90°
68°
30
90°
70°
1
89°
71°
2
85°
70°
3
86°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Iah / Airport Area
Iah / Airport Area's September 2026 forecast shows daily high temperatures ranging from 84° to 96°, with overnight lows between 66° and 77°. The average high for September is 90° 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 Iah / Airport Area. See also: October | November | December.
