S
M
T
W
T
F
S
29
46°
31°
30
65°
27°
31
48°
37°
1
43°
25°
2
42°
40°
3
66°
35°
4
51°
45°
5
49°
32°
6
44°
28°
7
40°
22°
8
46°
30°
9
52°
38°
10
56°
38°
11
58°
37°
12
55°
37°
13
54°
40°
14
58°
41°
15
57°
34°
16
47°
28°
17
46°
29°
18
47°
34°
19
51°
37°
20
59°
43°
21
62°
44°
22
61°
44°
23
63°
45°
24
63°
44°
25
62°
44°
26
63°
43°
27
55°
39°
28
51°
39°
29
53°
42°
30
54°
43°
1
54°
39°
2
55°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Johnstown
Johnstown's April 2026 forecast shows daily high temperatures ranging from 40° to 66°, with overnight lows between 22° and 45°. The average high for April is 54° with an average low of 37°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in Johnstown. See also: May | June | July.
