SeasonMapCascais weather in March
Portugal
March in Cascais: cool, a little rain, with clean air — a great time to visit.
#8 of 12 months in Cascais · #734 of 1383 destinations to visit in March · comfort 74/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Cascais in March
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 — March
| Daytime high | 18°C / 64°F | 🙂 cool |
|---|---|---|
| Nighttime low | 12°C / 53°F | |
| Feels like (high) | 15°C / 59°F | |
| Sea temperature | 15°C / 60°F | 🥶 cold sea |
| Rainfall | 75 mm / 2.9 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 9°C / 49°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 12 h | |
| Wind | 25 km/h / 15 mph | |
| Air quality (US AQI) | 49 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Cascais in March
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.
BusyEaster holidays in Portugal, school holidays in 4 of the markets that fill it(estimated)
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).
Fair 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 March
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.
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 March — FAQ
- Is March a good time to visit Cascais?
- March in Cascais: cool, a little rain, with clean air — a great time to visit. It ranks #8 of 12 months for Cascais on SeasonMap's comfort score (74/100).
- What is the weather like in Cascais in March?
- In March, Cascais averages a daily high of 17.6°C and a low of 11.7°C, with about 74.6 mm of rain over roughly 10.4 rainy days.
- What is the air quality in Cascais in March?
- Cascais has a mean US Air Quality Index of about 49 in March.
Other months in Cascais
Compare Cascais in March
Warmer or cooler than Cascais in March
Similar destinations in Southern Europe — March
Within 300 km: Sintra's Camellia season around 15 Jan – 20 Mar, and Évora's Alentejo spring around 1 Mar – 30 Apr.