December · Portugal
Best time to visit Cascais in December Weather, crowds & prices
Weather in Cascais in December
Average temperature 15°C, 90 mm of rain, about 0 days with 6+ hours of sunshine and 83% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
1.8/10
Ranked #12 of 12 months
- Avg temp
- 15°C
- Rainfall
- 90 mm
- Humidity
- 83%
- Days with 6h+ sun
- 0
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
December in Cascais scores 1.8/10 for beach and coastal travel - ranked #12 of 12. Expect around 15°C, 90 mm of rain, and roughly 0 days with 6+ hours of sunshine this month.
Cascais pairs a walkable former fishing town with sheltered beaches, an Atlantic promenade, and the wilder coast toward Guincho.
December in Cascais: expect compromises
Temperatures hover around 15°C (58°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 90 mm of rain this month — a flexible day or two helps — with almost no days with 6+ hours of sunshine and 9.3 hours of daylight to work around it.
That is 1.8/10 on the same scale — 12th of 12 months, versus 8.5/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Expect low-season pricing, and crowds are light for this destination.
If your dates are flexible, August is materially better in Cascais — 6.7 points higher on the same scale.
Frequently asked
- What is the weather like in Cascais in December?
- In December, Cascais averages 15°C, 90 mm of rain, and about 0 days with 6+ hours of sunshine. Its climate-comfort score is 1.8/10.
- Is December a good time to visit Cascais?
- December earns a 1.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Cascais in December?
- Expect about 90 mm of rain in December. Average humidity is 83% and there are about 0 days with 6+ hours of sunshine.
Curated in Cascais
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Things to do in Cascais
Cascais, Portugal. Live activities and tours from GetYourGuide, matched to this destination.