S
M
T
W
T
F
S
30
77°
54°
1
62°
54°
2
64°
49°
3
72°
58°
4
73°
54°
5
64°
54°
6
68°
58°
7
70°
64°
8
64°
53°
9
69°
57°
10
75°
64°
11
71°
66°
12
75°
67°
13
75°
69°
14
73°
62°
15
64°
49°
16
71°
61°
17
71°
65°
18
78°
65°
19
70°
66°
20
75°
69°
21
73°
69°
22
72°
70°
23
74°
71°
24
75°
71°
25
75°
71°
26
76°
71°
27
76°
72°
28
77°
72°
29
74°
51°
30
60°
50°
31
66°
53°
1
71°
63°
2
80°
66°
3
77°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Port Isabel
Port Isabel's December 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for December is ° with an average low of °. 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 Isabel. See also: January | February | March.
