May weather forecast
Vilamoura, Portugal

May marks the true arrival of spring with distinctive warming trends and reduced rainfall. Larger amounts of sunshine and the extension of daylight hours cater to long sunny afternoons and gentle evenings. Weather patterns change from April to May with a significant decrease in rainfall, marking the onset of the dry season in Vilamoura, Portugal. The temperature fluctuates from 12°C (53.6°F) at night to balmy highs of 22°C (71.6°F) during the day. With the UV Index ticking up to 8, it is a clear signal that the sun’s intensity is building up, suggesting careful planning for outdoor activities.

Temperature

May comes with a subtle rise, with the average high-temperature adjusting from a comfortable 19°C (66.2°F) in April to an agreeable 22°C (71.6°F). An average low-temperature of 12°C (53.6°F) is noted in Vilamoura during the month of May.

Rainfall

In Vilamoura, in May, it is raining for 5 days, with typically 29mm (1.14") of accumulated precipitation. In Vilamoura, during the entire year, the rain falls for 77 days and collects up to 557mm (21.93") of precipitation.

Sea temperature

In May, the average sea temperature in Vilamoura is 17°C (62.6°F).
Note: Swimming is not an enjoyable activity for the majority when the water is at 17°C (62.6°F). The difficulty of controlling breathing increases as the temperature dips from 21°C (69.8°F) to 15°C (59°F).

Daylight

In May, the average length of the day is 14h and 10min.
On the first day of the month, sunrise is at 06:37 and sunset at 20:21. On the last day of May, in Vilamoura, sunrise is at 06:14 and sunset at 20:46 WEST.

Sunshine

The average sunshine in May in Vilamoura, Portugal, is 10h.

UV index

In May, the average daily maximum UV index is 8. A UV Index of 8 to 10 symbolizes a very high threat to health from exposure to the Sun's UV rays for the average person.
Note: An average UV index of 8 in May transforms into this advice:
Without proper safety measures, skin and eyes can be quickly harmed. Be sure to protect yourself. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.