S
M
T
W
T
F
S
26
92°
77°
27
93°
76°
28
93°
77°
29
94°
78°
30
94°
78°
31
93°
77°
1
92°
78°
2
94°
78°
3
94°
77°
4
93°
78°
5
94°
77°
6
93°
76°
7
93°
75°
8
91°
74°
9
91°
76°
10
94°
77°
11
95°
76°
12
91°
74°
13
93°
74°
14
94°
76°
15
92°
75°
16
91°
75°
17
94°
74°
18
94°
75°
19
93°
75°
20
92°
74°
21
92°
76°
22
93°
76°
23
90°
75°
24
90°
75°
25
91°
74°
26
90°
74°
27
92°
73°
28
92°
74°
29
93°
73°
30
92°
74°
31
89°
73°
1
90°
74°
2
89°
71°
3
89°
70°
4
88°
70°
5
88°
71°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Port Arthur
Port Arthur's August 2026 forecast shows daily high temperatures ranging from 88° to 95°, with overnight lows between 70° and 78°. The average high for August is 92° with an average low of 75°. 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 Arthur. See also: September | October | November.
