S
M
T
W
T
F
S
26
80°
58°
27
80°
50°
28
74°
52°
29
74°
54°
30
75°
52°
31
75°
48°
1
74°
49°
2
73°
48°
3
72°
48°
4
73°
49°
5
73°
47°
6
74°
50°
7
75°
54°
8
76°
55°
9
75°
57°
10
78°
50°
11
77°
56°
12
81°
55°
13
77°
52°
14
81°
48°
15
73°
47°
16
73°
53°
17
74°
47°
18
72°
46°
19
71°
47°
20
72°
47°
21
73°
49°
22
71°
47°
23
71°
49°
24
72°
52°
25
74°
46°
26
71°
55°
27
77°
55°
28
78°
53°
29
79°
48°
30
77°
46°
31
69°
44°
1
69°
45°
2
68°
53°
3
71°
48°
4
72°
43°
5
67°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Harriston
Harriston's August 2026 forecast shows daily high temperatures ranging from 67° to 81°, with overnight lows between 43° and 58°. The average high for August is 74° with an average low of 50°. 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 Harriston. See also: September | October | November.
