May weather forecast
Porto Santo Island, Portugal

In May, Porto Santo Island experiences a significant jump in temperature to 20.6°C (69.1°F), making it one of the warmest months so far. The warming effect of the changing season makes its presence felt, inviting visitors to take a dip in the sea which also starts to warm up from 17.9°C (64.2°F) to 18.8°C (65.8°F). The longer daytime and decreasing rainfall set the mood for picnics and beach trips in this Portuguese island. The mild weather and longer daylight hours significantly contribute to the island’s appeal in May. It is also a great time to take a trip to the visually stunning Pico de Ana Ferreira.

Temperature

The advent of May denotes an average high-temperature of an agreeable 20.6°C (69.1°F), subtly different from April's 19.1°C (66.4°F). During May, Porto Santo Island records a consistent average nighttime temperature of 15.4°C (59.7°F).

Humidity

The average relative humidity in May in Porto Santo Island is 75%.

Rainfall

In May, in Porto Santo Island, the rain falls for 5 days. Throughout May, 14mm (0.55") of precipitation is accumulated. In Porto Santo Island, during the entire year, the rain falls for 97 days and collects up to 382mm (15.04") of precipitation.

Sea temperature

In May, the average sea temperature in Porto Santo Island is 18.8°C (65.8°F).
Note: For swimming, a surface water temperature of 18.8°C (65.8°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

The average length of the day in May is 13h and 52min.
On the first day of the month, sunrise is at 07:16 and sunset at 20:47. On the last day of May, in Porto Santo Island, sunrise is at 06:57 and sunset at 21:08 WEST.

Sunshine

In May, the average sunshine in Porto Santo Island is 7h.

UV index

The average daily maximum UV index in May is 9. A UV Index of 8 to 10 symbolizes a very high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In May, a regular UV index of 9 translates into these guidelines:
Immediate care is essential; skin and eyes can be harmed in no time without it. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.