S
M
T
W
T
F
S
26
79°
62°
27
79°
61°
28
74°
61°
29
74°
60°
30
76°
62°
31
80°
63°
1
80°
61°
2
77°
60°
3
82°
61°
4
82°
53°
5
75°
53°
6
76°
54°
7
75°
56°
8
72°
55°
9
72°
54°
10
73°
56°
11
75°
60°
12
79°
60°
13
78°
53°
14
74°
52°
15
72°
51°
16
74°
56°
17
74°
54°
18
73°
52°
19
73°
51°
20
74°
51°
21
75°
54°
22
78°
58°
23
80°
59°
24
80°
60°
25
81°
58°
26
80°
59°
27
81°
54°
28
78°
59°
29
79°
56°
30
74°
50°
31
71°
47°
1
68°
49°
2
68°
46°
3
69°
47°
4
69°
47°
5
68°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Alliston
Alliston's August 2026 forecast shows daily high temperatures ranging from 68° to 82°, with overnight lows between 46° and 63°. The average high for August is 76° with an average low of 55°. 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 Alliston. See also: September | October | November.
