S
M
T
W
T
F
S
26
85°
66°
27
86°
68°
28
86°
68°
29
83°
67°
30
82°
67°
31
86°
68°
1
87°
67°
2
85°
68°
3
86°
66°
4
86°
67°
5
85°
67°
6
80°
66°
7
83°
61°
8
81°
60°
9
80°
61°
10
80°
61°
11
82°
66°
12
85°
66°
13
86°
65°
14
86°
60°
15
81°
60°
16
80°
65°
17
80°
66°
18
82°
60°
19
80°
60°
20
80°
59°
21
81°
59°
22
83°
60°
23
83°
58°
24
81°
59°
25
81°
60°
26
83°
64°
27
84°
65°
28
83°
64°
29
85°
65°
30
84°
63°
31
82°
56°
1
79°
55°
2
76°
57°
3
77°
56°
4
77°
56°
5
76°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Johnstown
Johnstown's August 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 55° and 68°. The average high for August is 82° 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 Johnstown. See also: September | October | November.
