
Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 11 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 8AM (local time) - 1.5ft (0.5m), 11s period, W swell with offshore winds.
- Most powerful swell: Friday 14 Aug, 2AM (local time) - 4.5ft (1.4m), 10s period, WNW swell with 356 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 8AM (local time) - 1.5ft (0.5m), 11s period with W swell.
Best Forecast Surf Conditions for Belle Ile - Les Donnants this week:
The surf forecast for Belle Ile - Les Donnants over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 12) at 8AM. The primary swell is predicted to be 0.5m and 11s period with a secondary swell of 0.3m and 8s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Belle Ile - Les Donnants in the next 16 days are 1.4m 10s and forecast to arrive on Friday (Aug 14) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Tuesday (Aug 18) at 2AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Wed 12th Aug) | 1.5ft (0.5m) 11s |
| Best Surf | 8AM (Wed 12th Aug) | 1.5ft (0.5m) 11s |
| Most Powerful | 2AM (Fri 14th Aug) | 4.5ft (1.4m) 10s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
G’day, Rusty here, checkin’ in from the coast. Look, I’m gonna be straight with you – the next week or so is a real mixed bag, and honestly, mostly a washout at Belle Ile - Les Donnants. We’ve got a long stretch of ordinary to poor conditions, with the wind just not giving us a break. The wait is a tough one, but there’s a glimmer of hope way out at the end of the forecast window.
The first few days are a write-off. Wednesday morning the 12th kicks off with tiny 2ft swell from the west and a 10-second period, but the combined energy is weak (73). It’s clean, sure, but the swell is just too small to get excited about. After that, it’s a brutal run of onshore wind and poor surf right through until the 19th. We’re talking about a full week of junk, with the wind swinging from the west to the northwest, and the swell rarely breaking 3ft. The combined energy does bump up to 228 on Thursday afternoon, but it doesn’t matter because the wind is straight onshore and messy.
Thursday morning the 20th shows a little flicker of life. Swell picks up to 4ft from the west-northwest, with a 10-second period and a combined energy of 281 – that’s moderate wave energy. The wind is a gentle cross-shore, but the forecast calls it “marginal” with questionable conditions. It’s a tease, not a goer.
Then we get another gap. From Thursday afternoon the 20th right through to the evening of the 26th, it’s back to poor surf with onshore winds and tiny, weak swell. The combined energy drops to triple digits but mostly sits below 200, and the wind is either howling or onshore. Just a flat, frustrating stretch.
Now, here’s the payoff. The standout is Thursday morning, the 27th of August. This is the one we’ve been waiting for. The swell jumps to 6ft from the west-northwest, with a solid 9-second period and a combined energy of 1033 – that’s strong wave energy. The wind is offshore from the east at 12 mph, which is a dream. The report says “excellent surf conditions for experienced surfers,” and that’s no lie. At 6ft, it’s pushing the limit for beginners, but for anyone with a bit of salt in their veins, this is a proper session. The swell direction is west-northwest, which, given the guidance says the optimum swell direction is from the southwest, means it’s not a perfect match, but a 6ft groundswell with clean offshore wind is a rare treat after all this junk. This is the one to circle on the calendar. Keep in mind it’s a river mouth spot, so with a longer period (9 seconds) it should hold up well there.
Rusty.
Short Range ForecastMostly dry. Warm (max 30°C on Tue night, min 19°C on Fri morning). Winds increasing (light winds from the SE on Wed morning, fresh winds from the N by Thu night). | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Fri night. Warm (max 28°C on Fri night, min 17°C on Mon morning). Winds increasing (light winds from the NNW on Sat afternoon, fresh winds from the NNE by Sun night). | ||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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 12 | W 10 | W 10 | W 10 | W 10 | W 11 | WNW 10 | W 9 | W 9 | W 9 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 7 | WNW 7 | NNW 4 | WNW 7 | WNW 8 |
Wave Graph | |||||||||||||||||||
25 | 72 | 121 | 146 | 188 | 224 | 356 | 142 | 169 | 76 | 92 | 109 | 151 | 98 | 78 | 73 | 11 | 32 | 24 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | on | cross-on | cross-on | on | cross | cross | on | cross | cross | on | cross | cross | on | cross | cross-off | on | cross-off |
High Tide | 5:10AM4.04m | 5:27PM4.44m | 5:53AM4.20m | 6:10PM4.59m | 6:34AM4.26m | 6:49PM4.60m | 7:11AM4.23m | 7:27PM4.47m | 7:47AM4.10m | 8:03PM4.24m | 8:21AM3.91m | 8:37PM3.92m | |||||||
Low Tide | 10:49PM0.17m | 11:05AM0.20m | 11:36PM-0.06m | 11:50AM0.01m | 00:20AM-0.18m | 12:33PM-0.07m | 1:01AM-0.16m | 1:14PM-0.03m | 1:41AM-0.02m | 1:55PM0.13m | 2:20AM0.22m | 2:35PM0.38m | 2:59AM0.54m | ||||||
— | 7:03 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:11 | — | — | |
9:31 | — | — | 9:30 | — | — | 9:29 | — | — | 9:27 | — | — | 9:24 | — | — | 9:22 | — | — | 9:22 | |
mm | — | — | — | — | — | — | — | — | — | 3 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 30 | 26 | 27 | 27 | 24 | 27 | 29 | 21 | 26 | 28 | 19 | 23 | 23 | 19 | 23 | 25 | 18 | 19 | 21 |
Feels °C | 27 | 24 | 25 | 24 | 22 | 23 | 24 | 20 | 21 | 24 | 18 | 23 | 21 | 17 | 20 | 21 | 13 | 16 | 19 |
Swell 1 Height (m) Direction Period (s) | WNW 8 | W 10 | W 10 | W 10 | W 10 | W 11 | WNW 10 | W 9 | — | W 9 | WNW 8 | — | WNW 8 | WNW 8 | W 7 | WNW 7 | WNW 7 | — | WNW 6 |
11 | 72 | 121 | 146 | 188 | 224 | 356 | 142 | — | 76 | 92 | — | 151 | 98 | 28 | 73 | 5 | — | 20 | |
Swell 2 Height (m) Direction Period (s) | W 12 | E 3 | — | — | WNW 12 | — | — | — | — | W 11 | — | NNE 3 | — | — | — | — | W 7 | W 11 | WNW 8 |
25 | 2 | — | — | 29 | — | — | — | — | 2 | — | 1 | — | — | — | — | 4 | 2 | 24 | |
Swell 3 Height (m) Direction Period (s) | W 9 | SW 6 | — | — | — | — | — | — | — | W 11 | — | — | — | — | — | — | — | — | — |
7 | 1 | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NNW 2 | ESE 3 | WSW 6 | NW 3 | WNW 3 | WNW 3 | NW 5 | NNW 4 | W 9 | NW 6 | N 3 | WNW 8 | N 3 | NNE 3 | WNW 7 | NNE 4 | NNW 4 | WNW 7 | NE 4 |
1 | 2 | 3 | 6 | 2 | 4 | 51 | 5 | 169 | 54 | 3 | 109 | 6 | 1 | 78 | 8 | 11 | 32 | 17 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 101 | 0 | 158 | 36 | 44 | 158 | 36 | 28 | 158 | 49 | 28 | 32 | 36 | 30 | 435 | 125 | 437 | 436 | 451 |
Best forecast wave conditions in Morbihan - Brittany | |||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||
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Information about the Belle Ile - Les Donnants Surf forecast
The above surf forecast table for Belle Ile - Les Donnants provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Belle Ile - Les Donnants can be found by selecting the local surf guide option on the grey menu. Our Belle Ile - Les Donnants 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 (Belle Ile - Les Donnants) 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 Belle Ile - Les Donnants 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.
Belle Ile - Les Donnants is 48 km (30 miles) from Lorient. If you plan a holiday in Morbihan - Brittany, look for hotels and other accommodation in Lorient. Lorient has rooms for a wide range of budgets as well as car hire and transport links.











