Porto weather

Our guide to the weather in Porto during May

21

Average high

5

UV Index

97mm

Monthly rainfall

16

Sea temperature

Porto, Portugal is a picturesque and vibrant coastal destination with plenty of unique cultural experiences to explore - especially in May when the weather is ideal for sightseeing. We've looked at the most up-to-date weather data for Porto, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Porto weather in May.

How warm is it in Porto during May?

The temperature reaches around 21℃ during the daytime in May, falling away to 13℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it rain in Porto during May?

On average, there will be 5 rainy days during the month, amounting to 97.0mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in Porto during May?

You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in May. With warm air temperatures and high humidity, any breeze will feel warm but refreshing.

How warm is the sea in Porto during May?

The water around Porto is a bracing 16℃ during May and would be considered too cold for swimming. Those who are a bit more hardy or frequently swim in cooler open water might want to take a quick dip. A wetsuit would be advisable if you wish to spend longer than 5 minutes in the water.

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Weather in Porto

Our month-by-month guide to the weather and climate in Porto

13.5

Porto weather in

January
14.3

Porto weather in

February
16.3

Porto weather in

March
17.8

Porto weather in

April
20.8

Porto weather in

May
22.7

Porto weather in

June
25.2

Porto weather in

July
25.8

Porto weather in

August
24.8

Porto weather in

September
21.6

Porto weather in

October
16.2

Porto weather in

November
14.5

Porto weather in

December