Temperature
Cool by day, brisk at night.
59°Ftypical December high
Typical range
December climate
December in Cascais
Portugal · Europe
Cool days and good sunshine.
Some tradeoffs
Comparatively rainy.
Daytime high
59°F
Lows around 52°F
Rain
Several rainy days
Sun
7.5 h/day
Air feel
Very dry
Sea temp
63°F
Cool water
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days, with mixed-length spells. About 9 wet days, more than in most months.
30%wet-day frequency
AmountWet-day chance
Sunshine
A mix of sunshine and cloud.
7.3 hDecember sunshine
Heat & humidity by month
Very dryDecember Heat feel
Easy airWarm airHot airHumid air
Hourly temperature pattern
In December, afternoons feel about 53° and nights feel near 48°.
ColdCoolComfortableNight hours
Clear sky
Partly cloudy skies this month.
44%December Clear sky
Clear skyCloud
Wind pattern
Breezy conditions are typical in December. More a comfort consideration than a planning concern.
11 mphDecember Breezy
Sea temperature
63°FDecember sea temp
More detailIncludes daypart comfort
Typical December day
December late afternoons are around 58°F, and early evening stays near 57°F.
Avg temp Typical range
Morning55°F
Rain16%
Cloud59%
Humid airLow
Sun intensityMinimal
Midday58°F
Rain19%
Cloud56%
Humid airLow
Sun intensityModerate
Late afternoon58°F
Rain17%
Cloud54%
Humid airLow
Sun intensityLow
Early evening56°F
Rain15%
Cloud53%
Humid airLow
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 58 | 50 | 2.7 | 9 | 7.7 | 81 | 61 |
| Feb | 59 | 50 | 2.0 | 8 | 8.8 | 78 | 60 |
| Mar | 62 | 53 | 2.1 | 8 | 10.2 | 77 | 60 |
| Apr | 64 | 55 | 2.0 | 8 | 11.6 | 77 | 62 |
| May | 68 | 58 | 1.7 | 6 | 12.5 | 75 | 64 |
| Jun | 73 | 62 | 0.4 | 2 | 13.6 | 75 | 67 |
| Jul | 76 | 64 | 0.1 | 1 | 13.5 | 75 | 69 |
| Aug | 77 | 65 | 0.2 | 1 | 12.7 | 75 | 70 |
| Sep | 74 | 64 | 1.1 | 4 | 11.2 | 77 | 70 |
| Oct | 69 | 61 | 3.0 | 9 | 9.3 | 79 | 69 |
| Nov | 63 | 56 | 3.2 | 10 | 7.9 | 80 | 66 |
| Dec | 59 | 52 | 3.1 | 9 | 7.3 | 82 | 63 |
Similar climates
Similar
Similar travel styleCannesFranceSimilar travel styleBarcelonaSpainSimilar travel styleIbizaSpainSimilar travel styleSantoriniGreece
Want a side-by-side climate view? Compare Cascais with Cannes.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Aug 22, 2026
Data & methodology