S
M
T
W
T
F
S
30
89°
64°
31
92°
64°
1
88°
59°
2
88°
64°
3
88°
70°
4
93°
69°
5
83°
65°
6
79°
64°
7
83°
64°
8
84°
66°
9
82°
55°
10
N/A
11
82°
63°
12
76°
50°
13
64°
52°
14
67°
54°
15
71°
49°
16
68°
51°
17
72°
49°
18
71°
52°
19
72°
51°
20
68°
49°
21
69°
53°
22
68°
50°
23
57°
43°
24
73°
53°
25
74°
53°
26
74°
52°
27
73°
52°
28
72°
51°
29
68°
50°
30
71°
49°
1
63°
48°
2
67°
48°
3
66°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Dennison
Dennison's September 2026 forecast shows daily high temperatures ranging from 57° to 82°, with overnight lows between 43° and 63°. The average high for September is 70° with an average low of 51°. 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 Dennison. See also: October | November | December.
