Live wave height, wind and water temp — plus an 8-day forecast scored 0–100 for every sport.
Today at Plage de la Grande Mer: Epic! for kite foiling — 96/100 for expert level. Wind 9 kn E · Waves 2.3 m, 5 s · Tide -0.5 to -0.4 m. Best window around 12:00 UTC. Today's conditions at Plage de la Grande Mer: 1.8m waves with moderate offshore wind. Kite Foiling looks Epic! in the midday, with Wing Foiling also worth considering. Water temperature is 22°C / 72°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.
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, Blue Flag shingle bay facing SSW, within a national park, with a steeply shelving seabed and large rocks near the waterline. Calm, suited to swimming, pedal-boating, kayaking, and beginner windsurfing, though it can turn choppy in strong wind. Jet-skis and motorised towing are banned in park waters, with a 5-knot limit within 300 m of shore; dogs, even leashed, are not permitted. Lifeguards staff daily 15 Jun-1 Sep, 09:00-19:00.
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Plage de la Grande Mer scores 56/100 today for surfing at intermediate level — Okay. Wind 9 kn E · Waves 2.3 m, 5 s · Tide -0.5 to -0.4 m. Best window around 17:00 UTC. Scores are updated hourly by 4Shor ShorSense™.
Wind at Plage de la Grande Mer today: 9 kn E (gusting 30 kn). Wind direction relative to the shore affects surfing 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 Plage de la Grande Mer today: 2.3 m, 5 s period from S, mushy 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 surfing at Plage de la Grande Mer today is around 17:00 UTC, when conditions score 56/100 for intermediate level. Conditions can shift by the hour — the 4Shor app shows the full 24-hour score chart.
For beginners, Plage de la Grande Mer scores 56/100 today for kite surfing — Okay. 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.
Plage de la Grande Mer is scored for Surfing, Windsurfing, Kite Surfing, Kite Foiling, Wing 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.
Plage de la Grande Mer is a coastal location near Cassis 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 Plage de la Grande Mer, 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.
