S
M
T
W
T
F
S
27
34°
22°
28
32°
23°
29
37°
18°
30
36°
17°
31
29°
15°
1
30°
21°
2
33°
18°
3
33°
21°
4
34°
24°
5
34°
24°
6
35°
23°
7
34°
27°
8
39°
23°
9
40°
14°
10
35°
20°
11
29°
26°
12
38°
26°
13
41°
31°
14
45°
30°
15
47°
27°
16
44°
28°
17
42°
27°
18
37°
24°
19
39°
23°
20
36°
23°
21
34°
20°
22
37°
28°
23
39°
31°
24
Hist. Avg.
35°
19°
25
Hist. Avg.
35°
19°
26
Hist. Avg.
35°
19°
27
Hist. Avg.
35°
19°
28
Hist. Avg.
35°
19°
29
Hist. Avg.
35°
19°
30
Hist. Avg.
36°
19°
31
Hist. Avg.
36°
19°
1
Hist. Avg.
36°
19°
2
Hist. Avg.
36°
20°
3
Hist. Avg.
36°
20°
4
Hist. Avg.
36°
20°
5
Hist. Avg.
36°
20°
6
Hist. Avg.
37°
20°
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 47°, with overnight lows between 14° and 31°. The average high for January is 37° with an average low of 23°. 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.
