S
M
T
W
T
F
S
30
78°
47°
31
80°
51°
1
85°
54°
2
88°
57°
3
88°
53°
4
82°
45°
5
76°
45°
6
77°
50°
7
81°
50°
8
83°
51°
9
80°
49°
10
80°
44°
11
77°
45°
12
78°
48°
13
75°
43°
14
73°
41°
15
71°
40°
16
72°
39°
17
71°
40°
18
72°
41°
19
74°
45°
20
81°
46°
21
79°
42°
22
73°
41°
23
69°
40°
24
67°
39°
25
65°
37°
26
67°
38°
27
68°
38°
28
69°
43°
29
73°
40°
30
75°
41°
1
Hist. Avg.
70°
43°
2
Hist. Avg.
70°
43°
3
Hist. Avg.
69°
42°
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 65° to 88°, with overnight lows between 37° and 57°. The average high for September is 76° with an average low of 44°. 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.
