SeasonMapCascais weather in January
Portugal
January in Cascais: cool, a little rain, with clean air — a good time to visit.
#11 of 12 months in Cascais · #813 of 1383 destinations to visit in January · comfort 65/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Cascais in January
Other months in Cascais
Cascais's forum calls July hot and sunny but not especially humid, typically mid-20s to low-30s°C with a regular Atlantic breeze that helps take the edge off. Regulars flag the sea itself as genuinely cold year-round despite the warm air, and note evenings can turn cool enough for a light jacket even after a hot day.
Add your own note from Cascais's card on the map.
Cascais climate normals — January
| Daytime high | 16°C / 60°F | 🙂 cool |
|---|---|---|
| Nighttime low | 11°C / 51°F | |
| Feels like (high) | 14°C / 57°F | |
| Sea temperature | 16°C / 60°F | 🥶 cold sea |
| Rainfall | 56 mm / 2.2 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 9°C / 47°F | |
| Sunshine | 7.3 h/day | |
| Daylight | 9.8 h | |
| Wind | 23 km/h / 14 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Cascais in January
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Quiettravelers describe it as quiet, Cascais Christmas Village, Christmas holidays in Portugal
Sourced from traveler notes: “…from brief, staggered breaks), with the real upside being a tourist-free town compared to the summer crush.” — Tripadvisor community
Peak crowdsBusyShoulder seasonQuiet
Best months for Cascais's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherCascais's best weather comes in June, July and September — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Cascais in January
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Winter swell season
1 Oct – 31 MarSurf seasonThe Atlantic lows that make winter here grey are the same ones that make it the serious surf half of the year, at Guincho and around the point at Carcavelos.
- Festival
Cascais Christmas Village
20 Nov – 5 Jan · usuallyChristmas & New YearCrowdedThe Parque Marechal Carmona is given over to a ticketed Christmas village from late November, which is what fills the town on winter weekends when the beach cannot. Source ↗
Nearby, and something's on
Within 300 km of Cascais — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Cascais?
Cascais in January — FAQ
- Is January a good time to visit Cascais?
- January in Cascais: cool, a little rain, with clean air — a good time to visit. It ranks #11 of 12 months for Cascais on SeasonMap's comfort score (65/100).
- What is the weather like in Cascais in January?
- In January, Cascais averages a daily high of 15.7°C and a low of 10.6°C, with about 55.6 mm of rain over roughly 8 rainy days.
- What is the air quality in Cascais in January?
- Cascais has a mean US Air Quality Index of about 42 in January.
Other months in Cascais
Compare Cascais in January
Warmer or cooler than Cascais in January
Similar destinations in Southern Europe — January
Within 300 km: Sintra's Camellia season around 15 Jan – 20 Mar, and Lagos' Almond blossom around 15 Jan – 25 Feb.