Weather in Porto: May
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Average day temperature: | 68.5°F |
| Average night temperature: | 56.9°F | |
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Sea water temperature: | 59.7°F |
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Number of sunny days: | 18 days |
| Day length: | 14.0 - 14.9 hours | |
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Number of rainy days: | 4 days |
| Precipitation totals: | 2.2 in. | |
| more information | ||
14 days
forecast
forecast
| Porto |
sea water
temperature
temperature
| Porto |
Air temperature in May, °F
Show year:
2025
2024
2023
The highest day temperature during May of 2025 was 77°F. At the same time the lowest night temperature was 50°F. Daily and nightly averages during May were 66.1°F and 56.7°F.
Sea water temperature in Porto in May, °F
Show year:
2025
2024
2023
The average sea water temperature in May of 2025 was 60.7°F. The highest and lowest sea temperatures during the month were 62.8°F and 58.5°F.
Sunny, partly cloudy and cloudy days
Mostly all days in May are sunny but cloudy days are also possible.
Precipitation total in May, in.
Precipitation total value in Porto in May is 2.1 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 8.0 mph
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in May is: 9.3.
Best time for vacation in Porto
Porto on a weather map
Places in Portugal:
Name
°F
24 Hours Forecast
Porto
Local time: 02:36
December 05, friday
0300
54°F
N
11 mph
11 mph
0600
55°F
N
7 mph
7 mph
0900
57°F
E
9 mph
9 mph
1200
61°F
E
13 mph
13 mph
1500
61°F
NE
14 mph
14 mph
1800
59°F
NE
12 mph
12 mph
2100
59°F
NE
11 mph
11 mph
December 06, saturday
0000
59°F
NE
12 mph
12 mph
