S
M
T
W
T
F
S
30
101°
80°
31
100°
80°
1
99°
78°
2
99°
76°
3
92°
76°
4
98°
77°
5
98°
77°
6
99°
75°
7
100°
76°
8
99°
77°
9
98°
75°
10
95°
73°
11
96°
71°
12
93°
70°
13
94°
70°
14
88°
66°
15
92°
71°
16
91°
70°
17
92°
71°
18
91°
70°
19
91°
70°
20
90°
69°
21
89°
69°
22
87°
68°
23
87°
68°
24
89°
67°
25
89°
68°
26
88°
67°
27
89°
68°
28
89°
67°
29
88°
66°
30
88°
67°
1
87°
67°
2
87°
66°
3
86°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Keller
Keller's September 2026 forecast shows daily high temperatures ranging from 86° to 100°, with overnight lows between 66° and 78°. The average high for September is 92° with an average low of 71°. 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 Keller. See also: October | November | December.
