Porto weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: June – September
What is the weather like in Porto in May?
In May, Porto is mild: daytime highs average 20 °C, and nights cool down to about 12 °C. The sea averages 15.6 °C – swimming is only for the hardy. The sun shines for around 8 hours a day. Rain is frequent, with about 11 rainy days and 89 mm in total. All in all, May is an excellent month for a holiday in Porto.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 14 h 27 min06:17 – 20:44
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 18 km/haverage daily peak
- Cloud cover
- 54 %on average
- Hot days
- 1 day30 °C or more
- Time zone
- UTC+1Europe/Lisbon
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %90 %
- Few rainy daysweight 30 %52 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Porto in May: quick answers
Is Porto hot in May?
No. In May, Porto is mild: daytime highs average 20 °C and nights drop to about 12 °C.
Can you swim in Porto in May?
Only if you don't mind cold water: in May the sea averages just 15.6 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Porto in May?
Rain is frequent, with about 11 rainy days and 89 mm in total.
Porto month by month
The whole year in PortoAll destinations: PortugalWhere to go in MaySea temperature in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)