S
M
T
W
T
F
S
26
70°
54°
27
75°
55°
28
75°
59°
29
66°
61°
30
66°
57°
1
66°
54°
2
66°
54°
3
63°
55°
4
63°
54°
5
63°
52°
6
63°
48°
7
63°
48°
8
64°
54°
9
64°
55°
10
63°
54°
11
64°
55°
12
66°
55°
13
64°
54°
14
66°
48°
15
63°
52°
16
63°
48°
17
63°
50°
18
63°
48°
19
68°
55°
20
75°
54°
21
81°
59°
22
86°
61°
23
82°
63°
24
75°
61°
25
75°
61°
26
86°
64°
27
86°
62°
28
77°
62°
29
76°
61°
30
74°
58°
31
77°
62°
1
80°
60°
2
72°
56°
3
71°
55°
4
73°
57°
5
74°
56°
6
74°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Porto
Porto's May 2026 forecast shows daily high temperatures ranging from 71° to 86°, with overnight lows between 55° and 64°. The average high for May is 77° with an average low of 59°. 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 Porto. See also: June | July | August.
