S
M
T
W
T
F
S
26
76°
59°
27
83°
62°
28
82°
66°
29
78°
59°
30
84°
57°
31
85°
60°
1
77°
66°
2
77°
66°
3
80°
63°
4
85°
55°
5
89°
66°
6
88°
63°
7
84°
68°
8
86°
66°
9
86°
62°
10
82°
66°
11
75°
64°
12
75°
64°
13
83°
64°
14
77°
66°
15
80°
65°
16
84°
71°
17
80°
68°
18
80°
63°
19
80°
62°
20
82°
64°
21
82°
60°
22
81°
62°
23
73°
57°
24
73°
49°
25
79°
53°
26
79°
55°
27
82°
64°
28
N/A
29
81°
63°
30
85°
66°
31
88°
67°
1
90°
68°
2
91°
68°
3
85°
66°
4
86°
64°
5
82°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Johnstown
Johnstown's August 2026 forecast shows daily high temperatures ranging from 81° to 91°, with overnight lows between 60° and 68°. The average high for August is 86° with an average low of 65°. 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.
