- Temperature
- Feels like
- Rain
- Wind
- Sea water
- Waves
- Updated
Sea water: 20.5°C, cooling to around 18°C over the coming days
Waves: 2.4m
At 20.5 °C the water in Guincho is pleasant for swimming by Atlantic standards.
Sunrise: 07:03 · Sunset: 20:14 · Day length: 13h 11m
| Day | Sea water | Waves |
|---|---|---|
| Friday 28/08 | 20.5 °C | 2.4 m |
| Saturday 29/08 | 20.1 °C | 2.1 m |
| Sunday 30/08 | 20.6 °C | 1.5 m |
| Monday 31/08 | 20.3 °C | 1.5 m |
| Tuesday 01/09 | 19.3 °C | 1.6 m |
| Wednesday 02/09 | 17.6 °C | 1.2 m |
| Thursday 03/09 | 18.4 °C | 1.1 m |
| Month | Average water |
|---|---|
| January | 15.6 °C |
| February | 14.9 °C |
| March | 14.9 °C |
| April | 15.8 °C |
| May | 16.2 °C |
| June | 17.5 °C |
| July | 17.1 °C |
| August | 16.6 °C |
| September | 16.8 °C |
| October | 18.2 °C |
| November | 17.9 °C |
| December | 16.2 °C |
Monthly averages for 2022–2025.
This page shows the water temperature at Guincho today and over the next seven days, so you can pick the best beach day before you go.
Sea temperature moves much more slowly than air temperature. A hot afternoon does not warm the ocean, and a windy day can cool it fast. Checking the water itself is the only reliable way to know what to expect.
Guincho lies north of Cascais inside the Sintra-Cascais Natural Park, backed by dunes with the Serra de Sintra rising behind. The beach faces northwest straight into the Atlantic and catches the summer nortada at full strength, which is exactly what makes it a windsurf and kitesurf venue. That same wind drives cold water up from depth, so the sea sits near 16.7 °C in August and the currents here are serious.
The water is warmest in October, averaging 18.2 °C, and coldest in February at 14.9 °C. On the west coast the peak arrives late, in early autumn, because summer upwelling keeps pulling cold deep water to the surface.
The ocean gains and loses heat far more slowly than land, so it runs months behind the seasons. On top of that, the summer northerly wind pushes surface water offshore and draws cold deep water up in its place, which is why a heatwave on land so often coincides with a colder sea.
Windsurfers and kitesurfers own this beach on nortada afternoons, and it has hosted World Cup competitions for decades. Surfers take the mornings before the wind fills in, and the dunes and coastal path toward Cabo da Roca make a good walk when the sea is too much. Swimming needs real care here: the currents are strong and the water is cold.