Temperature Patterns in Coastal Cities Coastal cities maintain relatively moderate conditions throughout December, with average daytime temperatures ranging from 14°C to 18°C in the south to 11°C to 15°C in the north. Nighttime temperatures typically drop to 8°C to 12°C along the coast, rarely reaching freezing except in inland areas protected from maritime influence.
Northern Portugal December Weather Compared: Coastal vs. Mountain Climates
Cultural Experiences Enhanced by Weather The December climate creates perfect conditions for certain Portuguese traditions that shine during the cooler months. Central areas around Lisbon and the Ribatejo plains sit between these extremes, offering a compromise for travelers wishing to explore multiple destinations without drastic wardrobe changes.
The national average ranges from 80 to 120 millimeters of rainfall, with mountainous areas exceeding this significantly. A medium-weight waterproof jacket proves indispensable, as does a compact umbrella that can withstand coastal winds.
Northern Portugal December Weather Compared to the South
Regional Rainfall Comparison Region Average Rainfall (mm) Sunny Hours/Day Algarve 80-100 5-6 Lisbon Area 100-120 4-5 Porto/North 150-180 3-4 Serra da Estrela 200+ 2-3 What to Pack for December Travel Strategic packing for December in Portugal means balancing warmth with versatility. Northern regions, including Porto and the Minho area, experience cooler temperatures and higher rainfall, while the southern Algarve enjoys milder, more stable weather.
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