S
M
T
W
T
F
S
26
75°
59°
27
78°
62°
28
74°
65°
29
69°
61°
30
75°
56°
31
78°
56°
1
78°
61°
2
76°
66°
3
73°
62°
4
78°
57°
5
80°
66°
6
81°
66°
7
80°
66°
8
78°
64°
9
79°
66°
10
78°
66°
11
71°
63°
12
75°
63°
13
75°
64°
14
73°
64°
15
79°
62°
16
78°
67°
17
75°
65°
18
75°
61°
19
74°
59°
20
67°
59°
21
72°
55°
22
77°
55°
23
69°
57°
24
66°
52°
25
72°
58°
26
76°
56°
27
80°
61°
28
79°
51°
29
81°
62°
30
83°
67°
31
83°
66°
1
89°
69°
2
89°
67°
3
84°
62°
4
81°
58°
5
77°
56°
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 77° to 89°, with overnight lows between 51° and 69°. The average high for August is 83° with an average low of 62°. 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.
