Month guide · Castro Marim, Portugal
Castro Marim in December: weather and what to expect
In December, Castro Marim averages highs of 16°C and lows of 10°C, with about 7 rainy days and 64 mm of rain. Highs are 3°C cooler than in November and 1°C warmer than in January. Our rules rate it good for walking and cycling. Crowds in the Algarve are low.
Is December a good time to visit?
Good for
- Walking and cyclingHighs of 16°C with about 7 rainy days
Not ideal for
Nothing stands out as a weaker fit.
Daily highs through December
Town-level · ERA5-Land 1991-2020Highs fall about 1°C over the month. A day above 20°C happens in roughly 1 December in 4; nights below 5°C in about 1 in 3.
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 Castro Marim |
|---|---|---|---|
| Parchal, Algarve | 16°C | 9 | 96 km |
| Ferragudo, Algarve | 16°C | 9 | 96 km |
| Cabanas de Tavira, Algarve | 16°C | 7 | 17 km |
| Albufeira, Algarve | 16°C | 8 | 73 km |
| Armação de Pêra, Algarve | 16°C | 8 | 82 km |
The nearest towns with a warmer December. Distances are in a straight line.
How December is changing
Town-level · ERA5-LandDecember highs are 0.8°C warmer than in 1991-2000, and December rainfall is down about 40% (2016-2025 against 1991-2000). Days above 20°C in December went from 0.7 to 1.6 a year on average.
Questions about Castro Marim in December
Is December a good time to visit Castro Marim?
Our rules rate December good for walking and cycling (highs of 16°C with about 7 rainy days).
How warm is Castro Marim in December?
Average highs are 16°C and lows 10°C. November averages 19°C and January 15°C.
Does it rain much in Castro Marim in December?
About 7 days have at least 1 mm of rain, with 64 mm in total over the month.
Is Castro Marim busy in December?
In December 2025, nights booked through online platforms in the Algarve were about 15% 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 Castro Marim in December?
About 9 h 37 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