S
M
T
W
T
F
S
30
98°
72°
31
98°
72°
1
91°
75°
2
95°
76°
3
86°
76°
4
91°
75°
5
93°
73°
6
91°
75°
7
96°
73°
8
96°
75°
9
92°
74°
10
94°
72°
11
97°
72°
12
98°
76°
13
96°
74°
14
99°
73°
15
98°
73°
16
97°
73°
17
91°
74°
18
95°
68°
19
94°
66°
20
96°
67°
21
98°
72°
22
99°
71°
23
98°
73°
24
97°
71°
25
95°
65°
26
92°
64°
27
92°
71°
28
93°
71°
29
92°
75°
30
90°
74°
1
88°
73°
2
82°
69°
3
86°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Tomball
Tomball's September 2026 forecast shows daily high temperatures ranging from 82° to 93°, with overnight lows between 69° and 75°. The average high for September is 89° 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 Tomball. See also: October | November | December.
