S
M
T
W
T
F
S
29
37°
31°
30
37°
30°
1
36°
31°
2
36°
30°
3
35°
30°
4
36°
29°
5
34°
30°
6
37°
30°
7
38°
29°
8
36°
28°
9
34°
24°
10
29°
25°
11
33°
19°
12
30°
19°
13
31°
20°
14
30°
28°
15
36°
24°
16
35°
18°
17
31°
17°
18
28°
16°
19
26°
16°
20
25°
17°
21
25°
17°
22
26°
25°
23
35°
19°
24
36°
17°
25
34°
20°
26
35°
22°
27
30°
27°
28
37°
26°
29
37°
25°
30
32°
29°
31
34°
30°
1
36°
28°
2
40°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Port William
Port William's December 2026 forecast shows daily high temperatures ranging from 25° to 40°, with overnight lows between 16° and 31°. The average high for December is 33° with an average low of 24°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Port William. See also: January | February | March.
