S
M
T
W
T
F
S
26
94°
76°
27
93°
74°
28
93°
78°
29
94°
78°
30
95°
76°
31
95°
76°
1
96°
77°
2
97°
78°
3
95°
73°
4
95°
78°
5
94°
78°
6
95°
77°
7
94°
75°
8
93°
77°
9
92°
79°
10
93°
79°
11
94°
78°
12
95°
80°
13
96°
79°
14
94°
79°
15
95°
78°
16
96°
80°
17
94°
78°
18
90°
80°
19
93°
79°
20
94°
80°
21
94°
80°
22
93°
79°
23
94°
80°
24
94°
80°
25
93°
79°
26
94°
80°
27
94°
80°
28
93°
79°
29
93°
79°
30
94°
80°
31
94°
79°
1
92°
78°
2
92°
79°
3
93°
79°
4
94°
78°
5
90°
78°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Port Lavaca
Port Lavaca's August 2026 forecast shows daily high temperatures ranging from 90° to 96°, with overnight lows between 75° and 80°. The average high for August is 94° with an average low of 79°. 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 Lavaca. See also: September | October | November.
