S
M
T
W
T
F
S
26
84°
63°
27
84°
63°
28
83°
62°
29
81°
60°
30
79°
56°
31
76°
55°
1
76°
55°
2
77°
56°
3
78°
62°
4
78°
58°
5
79°
58°
6
79°
63°
7
83°
62°
8
79°
61°
9
78°
59°
10
79°
56°
11
81°
55°
12
82°
61°
13
83°
62°
14
84°
63°
15
83°
61°
16
84°
62°
17
85°
62°
18
82°
55°
19
78°
53°
20
75°
53°
21
75°
54°
22
76°
52°
23
76°
52°
24
77°
53°
25
80°
53°
26
81°
54°
27
82°
55°
28
79°
53°
29
74°
52°
30
75°
52°
31
79°
56°
1
81°
51°
2
75°
50°
3
74°
51°
4
75°
56°
5
78°
58°
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 74° to 85°, with overnight lows between 50° and 63°. The average high for August is 79° with an average low of 57°. 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.
