Offshore Stays

Surf Cascais in July

Surfing Cascais in July: outside the main surf season, air around 20°C, sea around 18°C, 0.1 mm of rain a day on average. Wetsuit: a 3/2mm full wetsuit.

Surf season

Off-season

Air temperature

20°C

Sea temperature

18°C

Rain

0.1 mm/day

Wind

22 km/h avg

Average wave height

1.3 m (4 ft)

Big days (top 10%)

1.8 m (6 ft)+

Swell period

9 s

Main swell direction

From NNW (338°)

What to wear: with the sea around 18°C in July, expect a 3/2mm full wetsuit.

Surf size in Cascais in July

Offshore of Cascais, waves in July average 1.3 m (4 ft), below the year-round average of 1.9 m — the smallest month of the year. One hour in ten is 1.8 m (6 ft) or bigger. The dominant swell runs at about 9 seconds from the NNW.

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.

July in the context of Cascais's surf season

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

Full Cascais surf and remote-work guide →

Frequently asked questions

Is July a good month to surf Cascais?
July is outside Cascais's main surf season (March–April, September–November), so surf is less reliable, though it can still work on the right day.
How warm is the sea in Cascais in July?
About 18°C on average, which calls for a 3/2mm full wetsuit.
What is the weather like in Cascais in July?
Air temperature averages 20°C, with about 0.1 mm of rain per day and average winds of 22 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.