Is September a good month to surf Cascais?

Yes — September falls in Cascais's main surf season (March–April, September–November).

How warm is the sea in Cascais in September?

About 18°C on average, which calls for a 3/2mm full wetsuit.

What is the weather like in Cascais in September?

Air temperature averages 20°C, with about 0.8 mm of rain per day and average winds of 17 km/h.

Surf Cascais in September

Surfing Cascais in September: in the main surf season, air around 20°C, sea around 18°C, 0.8 mm of rain a day on average. Wetsuit: a 3/2mm full wetsuit.

Surf season

In season

Air temperature

20°C

Sea temperature

18°C

Rain

0.8 mm/day

Wind

17 km/h avg

Average wave height

1.5 m (5 ft)

Big days (top 10%)

2.2 m (7 ft)+

Swell period

11 s

Main swell direction

From NW (315°)

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

Surf size in Cascais in September

Offshore of Cascais, waves in September average 1.5 m (5 ft), below the year-round average of 1.9 m — the 9th biggest month of the year. One hour in ten is 2.2 m (7 ft) or bigger. The dominant swell runs at about 11 seconds from the NW.

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.

September in the context of Cascais's surf season

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

Full Cascais surf and remote-work guide →

Frequently asked questions

Is September a good month to surf Cascais?: Yes — September falls in Cascais's main surf season (March–April, September–November).
How warm is the sea in Cascais in September?: About 18°C on average, which calls for a 3/2mm full wetsuit.
What is the weather like in Cascais in September?: Air temperature averages 20°C, with about 0.8 mm of rain per day and average winds of 17 km/h.