Offshore Stays

Surf Cascais in April

Surfing Cascais in April: in the main surf season, air around 15°C, sea around 15°C, 1.8 mm of rain a day on average. Wetsuit: a 4/3mm full wetsuit.

Surf season

In season

Air temperature

15°C

Sea temperature

15°C

Rain

1.8 mm/day

Wind

20 km/h avg

Average wave height

1.9 m (6 ft)

Big days (top 10%)

3.1 m (10 ft)+

Swell period

11 s

Main swell direction

From WNW (293°)

What to wear: with the sea around 15°C in April, expect a 4/3mm full wetsuit.

Surf size in Cascais in April

Offshore of Cascais, waves in April average 1.9 m (6 ft), above the year-round average of 1.9 m — the 6th biggest month of the year. One hour in ten is 3.1 m (10 ft) or bigger. The dominant swell runs at about 11 seconds from the WNW.

These are open-ocean figures from 10 years of hourly wave data, not a beach forecast: a sheltered break will be smaller, an exposed reef or point can be bigger.

April in the context of Cascais's surf season

Cascais's main surf season runs March–April, September–November. April is inside it.

Full Cascais surf and remote-work guide →

Frequently asked questions

Is April a good month to surf Cascais?
Yes — April falls in Cascais's main surf season (March–April, September–November).
How warm is the sea in Cascais in April?
About 15°C on average, which calls for a 4/3mm full wetsuit.
What is the weather like in Cascais in April?
Air temperature averages 15°C, with about 1.8 mm of rain per day and average winds of 20 km/h.
Climate: NASA POWER (MERRA-2) monthly climatology, 2001–2020. Sea temperature: NOAA Coral Reef Watch CoralTemp v3.1, 5 km monthly SST, 2015–2025 mean (nearest ocean cell). Surf season is Offshore Stays editorial. Waves: Open-Meteo Marine API, ECMWF ERA5-Ocean hourly reanalysis, 2016–2025 (offshore grid cell 38.5°N 9.5°W), retrieved 22 Oct 2026.