Porto weather in May 2026

Q: How hot is it in Porto in May?

Daytime temperatures usually reach 22°C in Porto in May, falling to 13°C at night.

Q: How sunny is it in Porto in May?

There are normally 9 hours of bright sunshine each day in Porto in May - that's 66% of daylight hours.

Q: How warm is the sea around Porto in May?

The average sea temperature around Porto in May is 16°C.

Q: Does it rain in Porto in May?

There are usually 8 days with some rain in Porto in May and the average monthly rainfall is 39mm.

Expect daytime maximum temperatures of 68°F in Porto, Portugal in May based on long-term weather averages. There are 9 hours of sunshine per day on average with 13 days with some rainfall and typically 3.4 inches of rainfall in the month.

68
68°F max day temperature
9
9 hours of sunshine per day
13
13 days with some rainfall
52
52°F min night temperature
15
15 hours of daylight per day
0
No heat & humidity
3.4
3.4 inches of monthly rainfall
7
7 (High) UV index
59
59°F sea temperature

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The May weather guide for Portugal (Porto) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)