S
M
T
W
T
F
S
30
82°
55°
31
71°
56°
1
72°
62°
2
77°
61°
3
75°
55°
4
75°
58°
5
78°
53°
6
69°
54°
7
70°
54°
8
68°
50°
9
68°
56°
10
72°
53°
11
70°
50°
12
68°
51°
13
67°
50°
14
69°
55°
15
70°
50°
16
66°
49°
17
65°
48°
18
64°
47°
19
64°
48°
20
65°
49°
21
64°
51°
22
64°
48°
23
67°
55°
24
70°
50°
25
70°
56°
26
71°
54°
27
71°
46°
28
63°
47°
29
61°
54°
30
66°
54°
1
64°
53°
2
66°
52°
3
61°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Dunnville
Dunnville's September 2026 forecast shows daily high temperatures ranging from 61° to 82°, with overnight lows between 45° and 62°. The average high for September is 69° with an average low of 52°. 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 Dunnville. See also: October | November | December.
