S
M
T
W
T
F
S
30
81°
57°
31
83°
61°
1
82°
61°
2
79°
59°
3
81°
51°
4
75°
51°
5
74°
54°
6
76°
59°
7
80°
58°
8
77°
55°
9
74°
56°
10
75°
58°
11
78°
59°
12
81°
58°
13
81°
58°
14
80°
57°
15
80°
56°
16
79°
56°
17
75°
49°
18
73°
48°
19
71°
46°
20
70°
45°
21
68°
46°
22
69°
52°
23
70°
46°
24
72°
46°
25
71°
53°
26
72°
52°
27
73°
53°
28
76°
52°
29
75°
50°
30
73°
48°
1
68°
49°
2
73°
50°
3
67°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Allen
Allen's September 2026 forecast shows daily high temperatures ranging from 67° to 83°, with overnight lows between 44° and 61°. The average high for September is 75° with an average low of 53°. 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 Allen. See also: October | November | December.
