S
M
T
W
T
F
S
27
43°
19°
28
40°
12°
29
37°
15°
30
35°
8°
31
31°
6°
1
24°
15°
2
29°
22°
3
37°
17°
4
40°
16°
5
37°
9°
6
31°
7°
7
27°
7°
8
28°
12°
9
28°
17°
10
35°
7°
11
38°
3°
12
29°
6°
13
25°
5°
14
25°
10°
15
29°
12°
16
34°
6°
17
29°
7°
18
26°
6°
19
26°
11°
20
39°
22°
21
38°
22°
22
39°
20°
23
37°
17°
24
36°
20°
25
35°
22°
26
37°
17°
27
37°
9°
28
34°
18°
29
34°
22°
30
36°
23°
31
Hist. Avg.
37°
16°
1
Hist. Avg.
37°
16°
2
Hist. Avg.
37°
16°
3
Hist. Avg.
37°
16°
4
Hist. Avg.
37°
16°
5
Hist. Avg.
38°
16°
6
Hist. Avg.
38°
17°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
January Weather in Johnstown
Johnstown's January 2027 forecast shows daily high temperatures ranging from 24° to 43°, with overnight lows between 3° and 23°. The average high for January is 33° with an average low of 13°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how January weather will actually feel in Johnstown. See also: February | March | April.
