S
M
T
W
T
F
S
27
32°
13°
28
36°
14°
29
31°
12°
30
34°
11°
31
33°
1°
1
29°
0°
2
23°
6°
3
25°
4°
4
28°
3°
5
30°
9°
6
30°
4°
7
29°
10°
8
29°
9°
9
31°
2°
10
26°
9°
11
25°
3°
12
31°
2°
13
26°
4°
14
26°
6°
15
27°
7°
16
35°
10°
17
37°
12°
18
33°
17°
19
33°
12°
20
37°
13°
21
35°
5°
22
33°
4°
23
31°
7°
24
32°
12°
25
34°
15°
26
35°
16°
27
40°
14°
28
33°
14°
29
37°
16°
30
Hist. Avg.
30°
6°
31
Hist. Avg.
31°
6°
1
Hist. Avg.
31°
6°
2
Hist. Avg.
31°
6°
3
Hist. Avg.
31°
6°
4
Hist. Avg.
32°
6°
5
Hist. Avg.
32°
6°
6
Hist. Avg.
32°
7°
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 23° to 40°, with overnight lows between 0° and 17°. The average high for January is 31° with an average low of 9°. 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.
