S
M
T
W
T
F
S
26
86°
79°
27
86°
80°
28
86°
80°
29
87°
80°
30
87°
80°
31
88°
80°
1
89°
80°
2
87°
81°
3
88°
79°
4
88°
81°
5
88°
78°
6
88°
80°
7
85°
80°
8
86°
81°
9
85°
79°
10
88°
82°
11
88°
82°
12
90°
81°
13
89°
82°
14
89°
81°
15
87°
81°
16
86°
81°
17
86°
82°
18
87°
82°
19
88°
81°
20
89°
80°
21
92°
80°
22
90°
80°
23
96°
79°
24
87°
80°
25
88°
80°
26
85°
82°
27
87°
81°
28
87°
81°
29
86°
82°
30
85°
82°
31
89°
82°
1
87°
81°
2
89°
82°
3
88°
82°
4
88°
82°
5
88°
82°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Port Isabel
Port Isabel's August 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for August 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 August weather will actually feel in Port Isabel. See also: September | October | November.
