S
M
T
W
T
F
S
26
83°
62°
27
82°
62°
28
83°
63°
29
85°
62°
30
85°
63°
31
84°
64°
1
85°
63°
2
84°
63°
3
83°
58°
4
79°
55°
5
77°
55°
6
75°
54°
7
81°
59°
8
83°
62°
9
83°
62°
10
80°
58°
11
80°
62°
12
76°
58°
13
Hist. Avg.
79°
58°
14
Hist. Avg.
79°
58°
15
Hist. Avg.
79°
57°
16
Hist. Avg.
79°
57°
17
Hist. Avg.
79°
57°
18
Hist. Avg.
78°
57°
19
Hist. Avg.
78°
57°
20
Hist. Avg.
78°
57°
21
Hist. Avg.
78°
56°
22
Hist. Avg.
78°
56°
23
Hist. Avg.
78°
56°
24
Hist. Avg.
78°
56°
25
Hist. Avg.
77°
56°
26
Hist. Avg.
77°
55°
27
Hist. Avg.
77°
55°
28
Hist. Avg.
77°
55°
29
Hist. Avg.
77°
55°
30
Hist. Avg.
76°
54°
31
Hist. Avg.
76°
54°
1
Hist. Avg.
76°
54°
2
Hist. Avg.
76°
53°
3
Hist. Avg.
75°
53°
4
Hist. Avg.
75°
53°
5
Hist. Avg.
75°
52°
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 75° to 85°, with overnight lows between 54° and 64°. The average high for August is 82° with an average low of 60°. 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.
