S
M
T
W
T
F
S
26
87°
75°
27
85°
76°
28
86°
71°
29
87°
72°
30
85°
72°
1
86°
71°
2
86°
71°
3
85°
72°
4
85°
71°
5
86°
72°
6
86°
71°
7
87°
71°
8
86°
72°
9
85°
72°
10
85°
71°
11
86°
71°
12
87°
72°
13
86°
72°
14
85°
71°
15
85°
70°
16
86°
72°
17
86°
72°
18
87°
71°
19
85°
71°
20
85°
72°
21
86°
71°
22
85°
70°
23
85°
70°
24
86°
72°
25
85°
72°
26
85°
71°
27
86°
71°
28
85°
72°
29
88°
70°
30
88°
70°
31
89°
71°
1
89°
72°
2
90°
72°
3
90°
71°
4
89°
71°
5
89°
72°
6
88°
72°
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 85° to 90°, with overnight lows between 70° and 76°. The average high for May is 86° with an average low of 72°. 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.
