S
M
T
W
T
F
S
26
81°
63°
27
85°
64°
28
79°
67°
29
75°
65°
30
83°
62°
31
84°
60°
1
78°
67°
2
72°
62°
3
79°
62°
4
81°
58°
5
77°
60°
6
85°
67°
7
80°
70°
8
83°
67°
9
81°
62°
10
82°
70°
11
83°
65°
12
83°
63°
13
82°
65°
14
81°
63°
15
76°
64°
16
74°
63°
17
80°
66°
18
80°
61°
19
80°
62°
20
74°
58°
21
79°
58°
22
80°
64°
23
70°
59°
24
69°
58°
25
77°
61°
26
79°
67°
27
76°
58°
28
74°
56°
29
72°
60°
30
77°
68°
31
79°
71°
1
81°
65°
2
77°
64°
3
78°
66°
4
79°
65°
5
70°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Dunnville
Dunnville's August 2026 forecast shows daily high temperatures ranging from 70° to 81°, with overnight lows between 56° and 71°. The average high for August is 77° with an average low of 63°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Dunnville. See also: September | October | November.
