S
M
T
W
T
F
S
26
81°
57°
27
82°
58°
28
75°
61°
29
65°
60°
30
76°
60°
31
82°
62°
1
83°
59°
2
81°
66°
3
75°
60°
4
80°
57°
5
83°
57°
6
84°
64°
7
85°
65°
8
82°
65°
9
79°
59°
10
80°
53°
11
80°
62°
12
79°
57°
13
78°
61°
14
77°
55°
15
76°
51°
16
77°
50°
17
79°
62°
18
79°
61°
19
80°
55°
20
76°
51°
21
78°
54°
22
74°
62°
23
77°
56°
24
72°
53°
25
72°
53°
26
76°
57°
27
75°
54°
28
76°
54°
29
74°
55°
30
75°
56°
31
76°
57°
1
77°
56°
2
79°
53°
3
70°
56°
4
72°
50°
5
68°
50°
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 68° to 79°, with overnight lows between 50° and 62°. The average high for August is 75° 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 Johnstown. See also: September | October | November.
