Month guide · Nisa, Portugal
Nisa in December: weather and what to expect
In December, Nisa averages highs of 13°C and lows of 6°C, with about 9 rainy days and 84 mm of rain. Highs are 3°C cooler than in November and 1°C warmer than in January. Crowds in the Alentejo are low.
Is December a good time to visit?
Good for
No verdicts for Nisa in December yet. They only use climate values that are precise enough to judge with.
Not ideal for
- Warm-weather holidaysHighs of only 13°C
Daily highs through December
Town-level · ERA5-Land 1991-2020Highs fall about 1°C over the month. Nights below 0°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 Nisa |
|---|---|---|---|
| Castro Marim, Algarve | 16°C | 7 | 256 km |
| São Marcos da Serra, Algarve | 16°C | 9 | 248 km |
| Mértola, Alentejo | 16°C | 7 | 208 km |
| Odemira, Alentejo | 16°C | 9 | 230 km |
| Vila Nova de Milfontes, Alentejo | 16°C | 10 | 222 km |
The nearest towns with a warmer December. Distances are in a straight line.
How December is changing
Town-level · ERA5-LandDecember highs are 1.0°C warmer than in 1991-2000, and December rainfall is down about 25% (2016-2025 against 1991-2000).
Questions about Nisa in December
Is December a good time to visit Nisa?
It is less suited to warm-weather holidays (highs of only 13°C).
How warm is Nisa in December?
Average highs are 13°C and lows 6°C. November averages 16°C and January 12°C.
Does it rain much in Nisa in December?
About 9 days have at least 1 mm of rain, with 84 mm in total over the month.
Is Nisa busy in December?
In December 2025, nights booked through online platforms in the Alentejo 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 Nisa in December?
About 9 h 24 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