Surf Forecasts:
La Tranche sur Mer surf forecast from 17 Aug 2026:
- Best quality surf: Thursday 20 Aug, 8AM (local time) - 3ft (0.9m), 10s period, WNW swell with offshore winds.
- Most powerful swell: Thursday 20 Aug, 2PM (local time) - 3ft (0.9m), 10s period, WNW swell with 163 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 5AM (local time) - 2ft (0.6m), 10s period with W swell.
Best Forecast Surf Conditions for La Tranche sur Mer this week:
The surf forecast for La Tranche sur Mer over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 5AM. The primary swell is predicted to be 0.6m and 10s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at La Tranche sur Mer in the next 16 days are 0.9m 10s and forecast to arrive on Thursday (Aug 20) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Monday (Aug 17) at 8PM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 20th Aug) | 2ft (0.6m) 10s |
| Best Surf | 8AM (Thu 20th Aug) | 3ft (0.9m) 10s |
| Most Powerful | 2PM (Thu 20th Aug) | 3ft (0.9m) 10s |
Table - best surf conditions forecast for La Tranche sur Mer over the next 16 days.
The Lowdown
Alright, grab a coffee, 'cause we're looking at the next couple of weeks here, and it's gonna require a bit of patience.
Truth is, we're in a bit of a flat spell. For the next week or so, we're looking at nothing but tiny, weak leftovers. You'd be straining to catch a ripple most days. That run of tiny surf and ordinary conditions stretches from now, right through until about the 27th. We're talking eight, nine days with nothing worth paddling out for. The water's still warm though, around 72° with a touch warmer than usual for the time of year. That's something, I guess.
Now, the first real glimmer of hope shows up further down the line. Around Friday the 28th, we finally get some proper W swell pushing through. It's a groundswell with a solid 12-second period and moderate energy (333). But here's the catch – she's forecast to be a bit of a beast for our boy, La Tranche sur Mer. Swell heights are predicted around 4ft, and the comment says it clean and favorable for winds and tide, but likely too big for the break. It's a call I'd be cautious about. Keep an eye on it, but don't get your hopes up too high.
The real standout, the one that grabs my attention, is Monday the 31st. That afternoon, we get a proper pulse of long-period WNW groundswell, 4ft with a 12-second period. The energy jumps right up to 664, which is strong. The winds look light, and while it might still be pushing the limits for the beach, it's promising. Again, the notes say it might be too big for this setup, which for a beginner spot like this, is a bit of a warning. But for the more experienced locals, this could be the standout of the period, if it lines up right.
After that, the first of September is a mess. A strong SW breeze (25 mph) messes everything up on Tuesday morning. Afternoon cleans up a bit with W winds, but the damage is done.
So, here's the deal. The surf is tiny, the windows are narrow, and the best options have a major caveat. If you're a learner, this is a good week to work on your pop-up on the sand. If you're a seasoned hand, save your energy for that end-of-the-month pulse, but even then, be ready to pick your moment carefully.
Rusty out.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed morning. Warm (max 25°C on Mon afternoon, min 18°C on Wed afternoon). Winds decreasing (fresh winds from the WNW on Mon afternoon, light winds from the W by Wed morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Sat night, min 16°C on Fri morning). Winds decreasing (fresh winds from the WNW on Fri afternoon, light winds from the SSW by Sat afternoon). | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | W 7 | WNW 4 | WNW 5 | WNW 5 | W 9 | W 8 | W 8 | W 7 | W 10 | WNW 10 | WNW 10 | W 10 | W 9 | W 9 | W 9 | W 8 | W 8 | W 10 | W 9 | W 9 | W 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 24 | 0 | 12 | 9 | 39 | 5 | 5 | 10 | 31 | 132 | 159 | 115 | 85 | 108 | 57 | 35 | 34 | 30 | 15 | 14 | 6 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | cross-on | off | cross | cross | cross | cross |
High Tide | 8:12AM4.01m | 8:25PM4.04m | 8:36AM3.77m | 8:50PM3.69m | 9:03AM3.51m | 9:21PM3.35m | 9:39AM3.25m | 10:05PM3.03m | 10:49AM2.99m | 1:43AM2.92m | 2:15PM3.08m | 2:54AM3.07m | 3:15PM3.29m | 3:43AM3.29m | |||||||
Low Tide | 2:37PM0.22m | 3:00AM0.40m | 3:19PM0.57m | 3:42AM0.78m | 4:05PM0.94m | 4:28AM1.15m | 4:56PM1.28m | 5:22AM1.46m | 5:59PM1.53m | 6:30AM1.64m | 7:14PM1.59m | 7:46AM1.60m | 8:29PM1.44m | ||||||||
 |  |  | | | |  |  |  |  | | | | | | | | | | | | |
 | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:11 | — | — | 7:11 | — | — | 7:13 | — | — |
 | — | — | 9:12 | — | — | 9:10 | — | — | 9:08 | — | — | 9:07 | — | — | 9:06 | — | — | 9:04 | — | — | 9:01 |
mm | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 25 | 22 | 20 | 21 | 20 | 20 | 18 | 19 | 19 | 20 | 20 | 18 | 20 | 19 | 18 | 21 | 22 | 21 | 28 | 28 |
Feels °C | 22 | 22 | 17 | 21 | 20 | 18 | 22 | 17 | 17 | 17 | 17 | 17 | 16 | 17 | 14 | 14 | 19 | 19 | 15 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | W 7 | — | WNW 5 | WNW 5 | W 9 | W 8 | W 8 | W 7 | W 10 | WNW 10 | WNW 10 | W 10 | W 9 | — | W 9 | W 8 | WSW 11 | W 10 | W 9 | W 9 | W 9 |
| kJ | 24 | — | 12 | 9 | 2 | 5 | 5 | 10 | 31 | 132 | 159 | 115 | 85 | — | 57 | 35 | 12 | 30 | 15 | 14 | 6 |
Swell 2 Height (m) Direction Period (s) | — | — | W 10 | W 8 | — | — | — | W 14 | W 12 | — | — | — | — | — | W 12 | W 11 | W 11 | — | — | WNW 6 | WNW 7 |
| kJ | — | — | 2 | 5 | — | — | — | 4 | 3 | — | — | — | — | — | 3 | 2 | 9 | — | — | 4 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | W 7 | — | — | — | — | W 11 | — | — | — | — | — | — | — | — | — | NW 7 | — | — | — |
| kJ | — | — | 1 | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | 12 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | WNW 4 | NW 5 | — | W 9 | WNW 4 | WNW 4 | WNW 5 | WNW 4 | W 10 | W 9 | — | — | W 9 | WNW 3 | — | W 8 | NE 2 | NE 3 | ENE 3 | NE 3 |
| kJ | — | 16 | 32 | — | 39 | 5 | 3 | 5 | 4 | 67 | 113 | — | — | 108 | 2 | — | 34 | 1 | 2 | 1 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 338 | 1 | 263 | 672 | 263 | 263 | 565 | 16 | 0 | 35 | 0 | 0 | 329 | 16 | 34 | 0 | 1 | 96 | 381 | 151 |
Best forecast wave conditions in Vendee | |||||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||||
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Information about the La Tranche sur Mer Surf forecast
The above surf forecast table for La Tranche sur Mer provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at La Tranche sur Mer can be found by selecting the local surf guide option on the grey menu. Our La Tranche sur Mer surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (La Tranche sur Mer) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for La Tranche sur Mer may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Are you planning a holiday in Vendee? If you are looking for accommodation near La Tranche sur Mer, camping, hotels and holiday cottages in Vendee, consider staying in La Pallice which is 29 km (18 miles) away. Other places in and around Vendee where you can find information about places to rent, and car hire include Les Sables-d'Olonne which is 30 km (19 miles) away, La Rochelle, La Roche-sur-Yon and Marans.
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