S
M
T
W
T
F
S
30
100°
75°
31
101°
76°
1
100°
78°
2
101°
77°
3
96°
78°
4
98°
78°
5
100°
76°
6
98°
78°
7
99°
78°
8
99°
77°
9
99°
75°
10
98°
76°
11
100°
77°
12
102°
76°
13
100°
74°
14
96°
73°
15
95°
72°
16
96°
72°
17
95°
72°
18
96°
71°
19
92°
70°
20
83°
55°
21
92°
71°
22
92°
70°
23
90°
70°
24
82°
69°
25
82°
69°
26
86°
68°
27
86°
69°
28
85°
69°
29
86°
68°
30
86°
64°
1
79°
58°
2
78°
57°
3
78°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Killeen
Killeen's September 2026 forecast shows daily high temperatures ranging from 78° to 102°, with overnight lows between 55° and 78°. The average high for September is 91° with an average low of 70°. 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 Killeen. See also: October | November | December.
