Month guide · Viana do Castelo, Portugal
Viana do Castelo in May: weather and what to expect
May highs in Viana do Castelo are now 0.9°C warmer than in 1991-2000. The sea is still cool, around 15°C. In May, Viana do Castelo averages highs of 19°C and lows of 12°C, with about 13 rainy days and 133 mm of rain. Crowds in Norte are medium.
Is May a good time to visit?
Good for
No verdicts for Viana do Castelo in May yet. They only use climate values that are precise enough to judge with.
Not ideal for
- Reliable dry weatherAbout 13 rainy days in the month
Daily highs through May
Town-level · ERA5-Land 1991-2020Highs climb about 3°C over the month. A day above 25°C happens in roughly 1 May in 2.
May in detail
Town-level · ERA5-LandCrowds, holidays and daylight
Public holidays in May 2027
- 1 May Labor Day
- 27 May Corpus Christi
Local (municipal) holidays are not included.
Warmer in May
Where is warm in May →| Place | High | Rain days | From Viana do Castelo |
|---|---|---|---|
| Vila Velha de Ródão, Centro | 24°C | 8 | 247 km |
| Tomar, Oeste e Vale do Tejo | 23°C | 9 | 235 km |
| Torres Novas, Oeste e Vale do Tejo | 23°C | 9 | 248 km |
| Sardoal, Oeste e Vale do Tejo | 23°C | 9 | 247 km |
| Meia Via, Oeste e Vale do Tejo | 23°C | 9 | 248 km |
The nearest towns with a warmer May. Distances are in a straight line.
How May is changing
Town-level · ERA5-LandMay highs are 0.9°C warmer than in 1991-2000, and May rainfall is down about 40% (2016-2025 against 1991-2000). Days above 20°C in May went from 8.4 to 12 a year on average.
Questions about Viana do Castelo in May
Is May a good time to visit Viana do Castelo?
It is less suited to reliable dry weather (about 13 rainy days in the month).
How warm is Viana do Castelo in May?
Average highs are 19°C and lows 12°C. April averages 17°C and June 22°C.
Does it rain much in Viana do Castelo in May?
About 13 days have at least 1 mm of rain, with 133 mm in total over the month.
Is Viana do Castelo busy in May?
In May 2025, nights booked through online platforms in Norte were about 55% of the busiest month, which we count as medium. The figure is for the whole region and leaves out hotels.
How long are the days in Viana do Castelo in May?
About 14 h 30 min from sunrise to sunset in the middle of the month.
Sources
Climate: ERA5-Land, Copernicus Climate Change Service (C3S) Climate Data Store, contains modified Copernicus information (CC BY 4.0). Crowds: Eurostat, nights spent in short-stay accommodation booked through online platforms (tour_ce_omn12) (CC BY 4.0). Place names and populations: GeoNames (CC BY 4.0). Climate averages cover 1991-2020. Daylight: calculated from the town's coordinates. Full methodology