May weather forecast
Porto, Portugal

Ships docked along the shores on the coastal city of Porto, Portugal
Ships docked along the shores on the coastal city of Porto, Portugal

Weather in May

The last month of the spring, May, is an agreeable month in Porto, Portugal, with an average temperature varying between 20.1°C (68.2°F) and 11.6°C (52.9°F).

Temperature

In Porto, Portugal, the average high-temperature in May is almost the same as in April - an agreeable 20.1°C (68.2°F). In Porto, in May, the average low-temperature is 11.6°C (52.9°F).

Rainfall

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

Sea temperature

In May, the average sea temperature in Porto is 16.5°C (61.7°F).
Note: Swimming in 16.5°C (61.7°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

Daylight

The average length of the day in May in Porto, Portugal, is 14h and 30min.
On the first day of May, 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 20:59 WEST.

Sunshine

In Porto, Portugal, the average sunshine in May is 8.3h.

UV index

The average daily maximum UV index in May in Porto, Portugal, is 7. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect 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.
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FAQ

What is the temperature in May in Porto?

In Porto, in May, the average high-temperature is 20.1°C (68.2°F), and the average low-temperature is 11.6°C (52.9°F).

How many days does it rain in May in Porto?

In Porto, Portugal, in May, it is raining for 13 days, with typically 90mm (3.54") of accumulated precipitation.

What is the sea temperature in May in Porto?

In Porto, Portugal, in May, the average water temperature is 16.5°C (61.7°F). For most, swimming in 16.5°C (61.7°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

What is the average length of the day in May in Porto?

In May, the average day length in Porto is 14h and 30min.

When are sunrise and sunset in May in Porto?

In May, on the first day of the month, 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 20:59 WEST.

How many hours of sunshine does Porto have in May?

In Porto, Portugal, the average sunshine duration in May is 8.3h.

What is the UV index reading in May in Porto?

In Porto, the average daily maximum UV index in May is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from exposure to the Sun's UV radiation.
Average rainfall days
Average sunshine
Average UV index

Average temperature in May
Porto, Portugal

Average temperature in May - Porto, Portugal
  • Average high temperature in May: 20.1°C

The warmest month (with the highest average high temperature) is August (25.7°C).
The month with the lowest average high temperature is January (13.8°C).

  • Average low temperature in May: 11.6°C

The months with the highest average low temperature are July and August (15.9°C).
The coldest month (with the lowest average low temperature) is January (5.2°C).

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Average rainfall in May
Porto, Portugal

Average rainfall in May - Porto, Portugal
  • Average rainfall in May: 89.6mm

The wettest month (with the highest rainfall) is December (181mm).
The driest month (with the least rainfall) is July (20.4mm).

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Average rainfall days in May
Porto, Portugal

Average rainfall days in May - Porto, Portugal
  • Average rainfall days in May: 13 days

The month with the highest number of rainy days is January (17 days).
The month with the least rainy days is August (5 days).

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Average sea temperature in May
Porto, Portugal

Average sea temperature in May - Porto, Portugal
  • Average sea temperature in May: 16.5°C

The best month for swimming (with the highest average sea temperature) is September (18.2°C).
The coldest months (with the lowest average sea temperature) are February and March (13.8°C).

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Average daylight in May /
Average sunshine in May
Porto, Portugal

Average daylight in May / Average sunshine in May - Porto, Portugal
  • Average daylight in May: 14h and 30min

The month with the longest days is June (Average daylight: 15h and 5min).
The month with the shortest days is December (Average daylight: 9h and 16min).

  • Average sunshine in May: 8h and 18min

The month with the most sunshine is July (Average sunshine: 9h and 54min).
The months with the least sunshine are January and December (Average sunshine: 4h and 0min).

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Average UV index in May
Porto, Portugal

Average UV index in May - Porto, Portugal
  • Average UV index in May: 7

The months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 1).

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