Live wave height, wind and water temp — plus an 8-day forecast scored 0–100 for every sport.
Photo: Wilrooij / Wikimedia Commons · CC BY-SA 4.0
Today at Grande Grève: Excellent for windsurfing — 80/100 for advanced level. Wind 9 kn SW · Waves 1.5 m, 11 s · Tide -1.5 to 0.8 m. Best window around 21:00 UTC. Today's conditions at Grande Grève: 1.4m waves with moderate offshore wind. Kite Foiling looks Epic! in the afternoon, with Wing Foiling also worth considering. Water temperature is 16°C / 61°F.
Forecast updated · ShorSense™
Today plus the next two days are free for everyone — scored in 3-hour windows, just like the app. The full 8-day forecast lives in the 4Shor app.
Grande Grève faces E, so the prevailing westerly comes over the land before it reaches you. For windsurfing that usually means a gustier, less predictable flow than the raw wind speed suggests.
Today's wind is cross-offshore at 9 kn. Leaning offshore, so a failure drifts you away from the beach rather than back to it — rideable for windsurfing, but not the direction to push your luck in.
Over the published window Grande Grève clears 60/100 for windsurfing at Advanced, Expert levels — that is who this spot is for on this sport. Today, 0 of 10 daylight hours clear that line at Intermediate.
Among the 31 scored spots within reach today, Grande Grève ranks 28th for windsurfing. The order changes by discipline: the same conditions that put a spot top for one sport can drop it down the list for another.
Satellite-derived bathymetry with 10 m pixels and 10 cm vertical resolution out to ~40 m depth. The shape of the seabed is what determines where and how waves break.
Most apps run a single global model at 9–25 km. We blend regional NWP from national meteorological offices at 1.3–2 km — UK Met Office UKV, Météo-France AROME HD, ItaliaMeteo ICON-2I — with ECMWF IFS for the 8-day horizon. Finer resolution means the sea breeze, cliff funnelling and bay shadowing that changes everything for a session.
A nearshore wave model propagates the spectrum across the bathymetric mesh — modelling refraction, shoaling, dissipation, focusing and breaking as it goes. Most apps stop at swell + wind. We go further.
10 sport models × 4 ability levels weight wave height, period, wind, tide and breaking conditions differently — calibrated against ridden sessions so the scores mean what they say.
A sheltered, south-east-facing split beach on Brittany's north coast, about 400 m long: pebbles to the north, a wide sandy bay to the south opening fully at low tide. A watersports centre runs surf, kite and diving zones alongside family bathing. Water quality has rated excellent in recent years. Dogs are permitted; the beach is smoke-free. Supervision reports conflict between sources. Access is via a narrow winding lane, described as difficult.
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Wind at Grande Grève today: 9 kn SW (gusting 24 kn). Wind direction relative to the shore affects windsurfing conditions significantly — offshore winds produce cleaner, glassier surfaces while onshore winds add chop. These are daily averages; the 4Shor app shows hourly detail.
Waves at Grande Grève today: 1.5 m, 11 s period from N, peeling character. 4Shor derives nearshore wave conditions from ECMWF IFS 9-km atmospheric data and the IBI regional ocean model, updated hourly.
The best window for windsurfing at Grande Grève today is around 04:00 UTC, when conditions score 55/100 for intermediate level. Conditions can shift by the hour — the 4Shor app shows the full 24-hour score chart.
For beginners, Grande Grève scores 34/100 today for surfing — Poor. A score of 65–79 is Good for a beginner; 80+ is Excellent (90+ is Epic!); below 45 the session is usually not worth it. 4Shor scores every location across Beginner, Intermediate, Advanced and Expert levels.
Grande Grève is scored for Surfing, Windsurfing, Kite Surfing, Kite Foiling, Wing Foiling, E-Foiling, Paddleboarding, Swimming, Kayaking, Canoeing in the 4Shor forecast system. Conditions are rated Beginner through Expert for each sport, updated every hour, so you always know whether the session is worth the drive.
Grande Grève is a coastal location near Pen al Lan in France. It is one of more than 2,500 European water-sport locations scored daily by 4Shor.
4Shor's ShorSense™ system combines satellite-derived seafloor mapping, nearshore wave models, wind and tide data to generate a hyper-local forecast. At Grande Grève, conditions are scored hourly on a 0–100 scale for each sport and ability level. A score of 80+ means Excellent (90+ Epic!); 65–79 is Good; below 45 the session is usually not worth the drive.
Questions about 4Shor itself — accuracy, pricing, the free trial — are answered on the FAQ page.
