S
M
T
W
T
F
S
30
96°
76°
31
96°
76°
1
95°
75°
2
95°
76°
3
94°
76°
4
95°
75°
5
93°
74°
6
94°
75°
7
94°
75°
8
93°
74°
9
94°
75°
10
94°
75°
11
95°
74°
12
94°
75°
13
94°
75°
14
93°
74°
15
94°
74°
16
94°
73°
17
93°
74°
18
93°
73°
19
92°
72°
20
91°
73°
21
91°
68°
22
88°
67°
23
86°
65°
24
90°
67°
25
92°
70°
26
91°
69°
27
91°
69°
28
87°
68°
29
84°
70°
30
84°
69°
1
87°
68°
2
86°
68°
3
86°
67°
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 84° to 96°, with overnight lows between 65° and 76°. The average high for September is 92° 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.
