S
M
T
W
T
F
S
26
54°
43°
27
56°
40°
28
54°
39°
29
54°
42°
30
56°
40°
31
58°
43°
1
58°
44°
2
57°
39°
3
56°
39°
4
54°
38°
5
54°
38°
6
55°
39°
7
54°
38°
8
54°
38°
9
56°
39°
10
54°
41°
11
55°
43°
12
58°
42°
13
58°
40°
14
59°
45°
15
58°
40°
16
59°
42°
17
56°
40°
18
55°
43°
19
55°
41°
20
56°
41°
21
55°
45°
22
57°
41°
23
58°
40°
24
56°
41°
25
57°
42°
26
56°
40°
27
57°
42°
28
57°
41°
29
56°
41°
30
Hist. Avg.
57°
41°
31
Hist. Avg.
58°
42°
1
Hist. Avg.
58°
42°
2
Hist. Avg.
58°
42°
3
Hist. Avg.
58°
42°
4
Hist. Avg.
58°
42°
5
Hist. Avg.
58°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Port Arthur
Port Arthur's August 2026 forecast shows daily high temperatures ranging from 54° to 59°, with overnight lows between 38° and 45°. The average high for August is 56° with an average low of 41°. 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.
