S
M
T
W
T
F
S
29
75°
62°
30
78°
59°
1
78°
57°
2
75°
59°
3
70°
54°
4
77°
51°
5
72°
54°
6
68°
59°
7
72°
60°
8
75°
61°
9
74°
61°
10
76°
59°
11
77°
61°
12
77°
58°
13
Hist. Avg.
72°
56°
14
Hist. Avg.
72°
55°
15
Hist. Avg.
71°
55°
16
Hist. Avg.
71°
55°
17
Hist. Avg.
71°
54°
18
Hist. Avg.
71°
54°
19
Hist. Avg.
70°
54°
20
Hist. Avg.
70°
54°
21
Hist. Avg.
70°
54°
22
Hist. Avg.
70°
54°
23
Hist. Avg.
70°
54°
24
Hist. Avg.
70°
53°
25
Hist. Avg.
69°
53°
26
Hist. Avg.
69°
53°
27
Hist. Avg.
69°
53°
28
Hist. Avg.
69°
53°
29
Hist. Avg.
69°
53°
30
Hist. Avg.
69°
53°
31
Hist. Avg.
68°
53°
1
Hist. Avg.
68°
53°
2
Hist. Avg.
68°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Port Isabel
Port Isabel's December 2026 forecast shows daily high temperatures ranging from 68° to 78°, with overnight lows between 51° and 62°. The average high for December is 75° with an average low of 58°. 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.
