S
M
T
W
T
F
S
26
86°
71°
27
86°
76°
28
82°
75°
29
82°
73°
30
81°
71°
1
75°
56°
2
73°
57°
3
77°
56°
4
80°
61°
5
83°
67°
6
85°
72°
7
84°
66°
8
83°
63°
9
84°
65°
10
83°
69°
11
84°
66°
12
82°
70°
13
83°
69°
14
80°
65°
15
79°
64°
16
80°
63°
17
81°
65°
18
81°
65°
19
82°
66°
20
82°
66°
21
81°
71°
22
82°
70°
23
84°
71°
24
83°
72°
25
83°
70°
26
84°
70°
27
84°
71°
28
85°
69°
29
84°
68°
30
84°
70°
31
85°
71°
1
85°
72°
2
86°
72°
3
86°
73°
4
87°
74°
5
86°
74°
6
86°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Port Arthur
Port Arthur's May 2026 forecast shows daily high temperatures ranging from 73° to 87°, with overnight lows between 56° and 75°. The average high for May is 83° with an average low of 68°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Port Arthur. See also: June | July | August.
