Month guide · Viana do Castelo, Portugal
Viana do Castelo in December: weather and what to expect
In December, Viana do Castelo averages highs of 14°C and lows of 8°C, with about 15 rainy days and 228 mm of rain. Highs are 2°C cooler than in November and 1°C warmer than in January. Crowds in Norte are low.
Is December a good time to visit?
Good for
No verdicts for Viana do Castelo in December yet. They only use climate values that are precise enough to judge with.
Not ideal for
- Reliable dry weatherAbout 15 rainy days in the month
Daily highs through December
Town-level · ERA5-Land 1991-2020Highs fall about 1°C over the month.
December in detail
Town-level · ERA5-LandCrowds, holidays and daylight
Public holidays in December 2026
- 1 Dec Restoration of Independence Day
- 8 Dec Immaculate Conception
- 25 Dec Christmas Day
Local (municipal) holidays are not included.
Warmer in December
Where is warm in December →| Place | High | Rain days | From Viana do Castelo |
|---|---|---|---|
| Aljezur, Algarve | 16°C | 10 | 487 km |
| São Marcos da Serra, Algarve | 16°C | 9 | 483 km |
| Odemira, Alentejo | 16°C | 9 | 456 km |
| Mértola, Alentejo | 16°C | 7 | 461 km |
| Vila Nova de Milfontes, Alentejo | 16°C | 10 | 441 km |
The nearest towns with a warmer December. Distances are in a straight line.
How December is changing
Town-level · ERA5-LandDecember highs are 0.6°C warmer than in 1991-2000, and December rainfall is down about 20% (2016-2025 against 1991-2000).
Questions about Viana do Castelo in December
Is December a good time to visit Viana do Castelo?
It is less suited to reliable dry weather (about 15 rainy days in the month).
How warm is Viana do Castelo in December?
Average highs are 14°C and lows 8°C. November averages 16°C and January 13°C.
Does it rain much in Viana do Castelo in December?
About 15 days have at least 1 mm of rain, with 228 mm in total over the month.
Is Viana do Castelo busy in December?
In December 2025, nights booked through online platforms in Norte were about 35% of the busiest month, which we count as low. The figure is for the whole region and leaves out hotels.
How long are the days in Viana do Castelo in December?
About 9 h 11 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