S
M
T
W
T
F
S
29
75°
71°
30
76°
73°
31
76°
74°
1
76°
74°
2
77°
75°
3
77°
75°
4
77°
75°
5
76°
58°
6
69°
59°
7
72°
64°
8
73°
71°
9
74°
72°
10
74°
72°
11
75°
73°
12
78°
74°
13
76°
75°
14
77°
75°
15
77°
75°
16
77°
75°
17
82°
76°
18
82°
69°
19
72°
70°
20
77°
72°
21
81°
75°
22
80°
72°
23
81°
74°
24
80°
75°
25
82°
74°
26
83°
74°
27
79°
71°
28
82°
70°
29
84°
71°
30
83°
70°
1
87°
73°
2
87°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Port Isabel
Port Isabel's April 2026 forecast shows daily high temperatures ranging from 72° to 87°, with overnight lows between 69° and 76°. The average high for April is 81° with an average low of 73°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in Port Isabel. See also: May | June | July.
