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 20°C 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 86 mm of rainfall in the month.

20
20°C max day temperature
9
9 hours of sunshine per day
13
13 days with some rainfall
11
11°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
86
86 mm of monthly rainfall
7
7 (High) UV index
15
15°C sea temperature

More about Porto

Porto by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Portugal

TUI: Top deals & discounts on 2026/2027 holidays

Sale

Explore latest special offers & online deals from TUI
Free child places & £0 deposits with direct debit available
Book summer & winter sun holidays in 2026/2027

Go to TUI deal >>

View all TUI offers

TUI deal finder

Destination

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 / mm) | Imperial (°F / inches)