S
M
T
W
T
F
S
27
46°
9°
28
40°
8°
29
38°
11°
30
40°
7°
31
38°
9°
1
39°
16°
2
43°
17°
3
43°
10°
4
41°
9°
5
40°
7°
6
39°
8°
7
39°
8°
8
40°
10°
9
40°
11°
10
42°
11°
11
42°
7°
12
39°
8°
13
39°
8°
14
42°
11°
15
42°
10°
16
43°
7°
17
39°
10°
18
39°
12°
19
41°
14°
20
46°
20°
21
47°
16°
22
42°
11°
23
43°
11°
24
42°
12°
25
40°
10°
26
41°
9°
27
40°
14°
28
42°
17°
29
45°
21°
30
45°
20°
31
Hist. Avg.
45°
19°
1
Hist. Avg.
45°
20°
2
Hist. Avg.
46°
20°
3
Hist. Avg.
46°
20°
4
Hist. Avg.
46°
20°
5
Hist. Avg.
46°
20°
6
Hist. Avg.
46°
20°
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 38° to 47°, with overnight lows between 7° and 21°. The average high for January is 41° with an average low of 11°. 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.
