May weather forecast
Porto, Portugal

In May, Porto experiences a steady climb towards summer conditions. The mild temperatures of April give way to a noticeable increase in warmth. This month records a low rainfall of 90mm (3.54"), a dramatic decrease compared to the preceding months. The city's atmosphere becomes more vibrant as the days grow longer, and the sun shines brighter. Sea temperatures start to climb, making beach trips increasingly tempting.

Temperature

Shifting into May, Porto records an average high-temperature of a pleasant 20.1°C (68.2°F), presenting minor fluctuations compared to the previous month. The average temperature in Porto during May nights dips to a fresh 11.6°C (52.9°F).

Rainfall

In Porto, in May, it is raining for 13 days, with typically 90mm (3.54") of accumulated precipitation. In Porto, during the entire year, the rain falls for 147 days and collects up to 1237mm (48.7") of precipitation.

Sea temperature

In Porto, in May, the average water temperature is 16.5°C (61.7°F).
Note: For most individuals, swimming in 16.5°C (61.7°F) is not a pleasant experience. The difficulty in managing breathing increases as the temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in May is 14h and 30min.
On the first day of May in Porto, Portugal, sunrise is at 06:31 and sunset at 20:31. On the last day of the month, sunrise is at 06:04 and sunset at 21:00 WEST.

Sunshine

The average sunshine in May in Porto is 8.3h.

UV index

The average daily maximum UV index in May in Porto is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: A daily maximum UV index of 7 in May translates into the following instructions:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.