Weather in Porto in May 2025
Average weather
Average temperature in Porto in May
The expected average maximum temperature in May is +22°C with a maximum of +27°C and a minimum of +10°C.
The average maximum temperature goes down 6% by the end of the month, compared with the beginning of the month, from +22°C to +21°C.
Is Porto warm or cold in May?
Porto is typically mild in May.
Maximum temperatures go up compared to the previous month from +17°C to +19°C. The minimum temperature also goes up from +10°C to +13°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how May is compared to other months in Porto:
Water temperature in Porto in May
Water in Porto in May is Fresh. It varies from +14°C to +18°C, with an average of +16°C. This is almost similar to the air temperature, which averages +19°C.
In May, water temperatures are average relative to the rest of the year:
Can you swim in Porto in May?
Climate in Porto in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +17°C | +19°C | +22°C | ||||
| Min. temperature | ||||||
| +3°C | +5°C | +9°C | ||||
| Max. temperature | ||||||
| +30°C | +33°C | +34°C | ||||
| Rainfall | ||||||
| 103 mm | 80 mm | 32 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +15°C | +16°C | +17°C | ||||
| Humidity | ||||||
| 74% | 75% | 76% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 9 | 10 | 12 | ||||
| Cloudy days | ||||||
| 5 | 7 | 9 | ||||
| Rainy days | ||||||
| 15 | 13 | 9 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
May typically has worse weather conditions compared to April. It’s getting warmer as May arrives. The average maximum temperature goes up from +17°C to +19°C during the day. As May arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 103 mm to 80 mm. Humidity rises from 74% to 75%. The average wind speed doesn’t change much during May, staying around 3 m/s. The good news is there are likely to be more sunny days in May, from 9 to 10.
But maybe it is worth considering traveling in June as the weather gets better.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Porto is gradually increasing during May, going from 2 m/s to 2 m/s over the course of the month.
Rain
How was the weather last May in Porto?
Climate Change over Years
The climate in Porto in May has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+17°C) and the highest in 2022 (+20°C). The driest year was 2007 with only 565 mm of rainfall, and the wettest year was 2022 with 1854 mm.
FAQ
Is May a good time to visit Porto?
Can you sunbathe in Porto in May?
Can you swim in Porto in May?
Is Porto rainy in May?
Is it sunny in Porto in May?
Other cities in Portugal
Monthly weather in Porto
Source of the data
For this page, we’ve looked at the typical weather in Porto, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.