S
M
T
W
T
F
S
26
94°
75°
27
94°
75°
28
94°
74°
29
95°
74°
30
95°
75°
31
95°
75°
1
96°
76°
2
95°
77°
3
97°
74°
4
96°
74°
5
96°
76°
6
93°
75°
7
94°
75°
8
93°
75°
9
90°
78°
10
87°
79°
11
90°
79°
12
91°
79°
13
93°
79°
14
94°
78°
15
93°
77°
16
92°
76°
17
94°
75°
18
93°
77°
19
93°
76°
20
92°
75°
21
94°
74°
22
93°
76°
23
93°
77°
24
92°
77°
25
93°
77°
26
93°
76°
27
92°
77°
28
93°
77°
29
93°
76°
30
92°
77°
31
93°
77°
1
92°
76°
2
91°
77°
3
92°
76°
4
92°
76°
5
90°
75°
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 87° to 94°, with overnight lows between 74° and 79°. The average high for August is 92° with an average low of 77°. 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.
