S
M
T
W
T
F
S
26
67°
53°
27
67°
49°
28
67°
49°
29
66°
53°
30
69°
51°
31
66°
53°
1
67°
52°
2
65°
52°
3
66°
53°
4
65°
53°
5
67°
54°
6
65°
51°
7
65°
52°
8
68°
52°
9
65°
53°
10
65°
51°
11
66°
50°
12
67°
51°
13
66°
53°
14
67°
53°
15
64°
47°
16
67°
51°
17
68°
53°
18
69°
53°
19
68°
52°
20
67°
52°
21
68°
53°
22
68°
52°
23
67°
51°
24
68°
51°
25
68°
52°
26
67°
52°
27
66°
50°
28
67°
51°
29
66°
52°
30
65°
47°
31
67°
48°
1
67°
50°
2
66°
51°
3
65°
52°
4
65°
49°
5
64°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Johnstone
Johnstone's August 2026 forecast shows daily high temperatures ranging from 64° to 69°, with overnight lows between 47° and 54°. The average high for August is 67° 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 August weather will actually feel in Johnstone. See also: September | October | November.
