S
M
T
W
T
F
S
27
40°
23°
28
39°
27°
29
42°
30°
30
47°
33°
31
48°
35°
1
50°
34°
2
51°
27°
3
52°
21°
4
43°
18°
5
35°
17°
6
33°
18°
7
33°
25°
8
44°
19°
9
39°
17°
10
35°
14°
11
34°
11°
12
33°
15°
13
30°
13°
14
33°
13°
15
29°
15°
16
29°
17°
17
32°
15°
18
32°
16°
19
33°
12°
20
34°
16°
21
30°
30°
22
38°
27°
23
43°
22°
24
39°
21°
25
35°
15°
26
37°
16°
27
41°
14°
28
40°
29°
29
Hist. Avg.
42°
21°
30
Hist. Avg.
42°
21°
31
Hist. Avg.
42°
21°
1
Hist. Avg.
42°
21°
2
Hist. Avg.
42°
22°
3
Hist. Avg.
42°
22°
4
Hist. Avg.
42°
22°
5
Hist. Avg.
42°
22°
6
Hist. Avg.
42°
22°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
January Weather in Williamsport
Williamsport's January 2027 forecast shows daily high temperatures ranging from 29° to 52°, with overnight lows between 11° and 35°. The average high for January is 38° with an average low of 20°. 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 Williamsport. See also: February | March | April.
