Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 9 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 5AM (local time) - 1.5ft (0.4m), 11s period, W swell with offshore winds.
- Most powerful swell: Thursday 13 Aug, 8PM (local time) - 4ft (1.2m), 10s period, W swell with 313 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 5AM (local time) - 1.5ft (0.4m), 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 5AM. The primary swell is predicted to be 0.4m 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 1.2m 10s and forecast to arrive on Thursday (Aug 13) at 8PM. Winds are predicted to be onshore 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 11) at 5AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 12th Aug) | 1.5ft (0.4m) 11s |
| Best Surf | 5AM (Wed 12th Aug) | 1.5ft (0.4m) 11s |
| Most Powerful | 8PM (Thu 13th Aug) | 4ft (1.2m) 10s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright, this is Rusty comin' at ya from the coast. Let's be real straight up: the next couple of weeks are lookin' grim for a proper paddle. There's a real dry spell ahead, so don't be gettin' your hopes up too quick.
For the first week, from August 9th all the way through to the 15th, it's basically a write-off. We're talkin' tiny little waves, mostly around 1ft to 2ft, and the wind just keeps messin' it up. You'll get some clean spells on the mornings of the 11th and 12th with offshore breezes, but the swell is just too weak to bother with – the energy is in the doldrums (between 40 and 100). The 12th of August shows a little pulse of 2ft to 3ft with a clean offshore wind, but the conditions are still described as "very ordinary." Honestly, it's a tough stretch.
The one spot we've got to look at is Belle Ile - Les Donnants. It's a river break, consistent, and exposed to the SW. The water temp is sittin' around 68°, which is about normal for this time of year. The optimum swell direction is SW, but we're gettin' mostly WNW and W swell through the period, so it's not a perfect match.
Now, if you're desperate, the best of a bad bunch might be the morning of Wednesday, August 12th. We'll see a tiny 2ft swell from the West with a 10-second period (moderate energy at 100). The wind will be offshore from the East, which should keep things clean. But honestly, it's a "surfable" wave at best, nothin' to write home about.
After that, we get a little bump in energy on the 13th and 14th, but the onshore winds just wreck it. The 20th of August has a pulse of 3ft from the WNW with a long 11-second period (energy climbin' to 229), but the wind is cross-off, so it might be clean but still lookin' pretty ordinary. The 21st through the 24th is just more of the same: small, messy, and not worth the paddle out.
Honestly, this is a classic case of "don't bother." The setup is more interesting for a kite surfer than a paddle surfer on those windy afternoons. The finder's got nothin' good to say, so I'd keep the board in the bag and wait for the next system. Forecasts can change, but this one's lookin' stubborn.
Stay thirsty, Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Tue afternoon, min 18°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Fri afternoon. Warm (max 30°C on Fri night, min 20°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | WNW 9 | WNW 9 | NW 5 | WNW 9 | WNW 9 | WNW 8 | WNW 8 | WNW 8 | W 12 | W 10 | W 10 | W 9 | W 10 | W 11 | WNW 10 | W 10 | W 9 | W 9 | W 8 | WNW 8 | W 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 35 | 32 | 31 | 32 | 30 | 28 | 26 | 26 | 25 | 98 | 121 | 106 | 145 | 229 | 294 | 117 | 106 | 55 | 49 | 38 | 20 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross | cross | on | cross-off | off | cross-on | cross-off | off | on | on | on | on | cross | cross-on | on | cross-off | cross-off | cross-on | cross-off |
High Tide | 2:40PM3.50m | 3:21AM3.52m | 3:47PM3.83m | 4:21AM3.80m | 4:40PM4.17m | 5:10AM4.04m | 5:27PM4.44m | 5:53AM4.20m | 6:10PM4.59m | 6:34AM4.26m | 6:49PM4.60m | 7:11AM4.23m | 7:27PM4.47m | ||||||||
Low Tide | 8:10AM1.03m | 8:51PM0.81m | 9:19AM0.78m | 9:55PM0.48m | 10:16AM0.48m | 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 | |||||||
 | |  | | | | | | | | | | | | | |  | | | | | |
 | 7:00 | — | — | 7:01 | — | — | 7:03 | — | — | 7:03 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — |
 | — | — | 9:35 | — | — | 9:32 | — | — | 9:31 | — | — | 9:30 | — | — | 9:29 | — | — | 9:27 | — | — | 9:24 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | — |
Temp °C | 20 | 22 | 23 | 18 | 23 | 25 | 21 | 29 | 29 | 25 | 28 | 28 | 24 | 26 | 28 | 22 | 28 | 30 | 23 | 28 | 29 |
Feels °C | 16 | 19 | 19 | 16 | 19 | 21 | 17 | 26 | 26 | 22 | 24 | 26 | 22 | 21 | 23 | 19 | 24 | 27 | 22 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | WNW 9 | WSW 7 | WSW 7 | WNW 9 | WNW 5 | WNW 8 | WNW 8 | WNW 8 | W 10 | W 10 | W 9 | W 10 | W 11 | WNW 10 | W 10 | W 9 | WNW 6 | W 8 | WNW 8 | W 8 |
| kJ | 35 | 32 | 27 | 20 | 30 | 8 | 26 | 26 | 11 | 98 | 121 | 106 | 145 | 229 | 294 | 117 | 106 | 40 | 49 | 38 | 20 |
Swell 2 Height (m) Direction Period (s) | NW 3 | W 9 | WNW 9 | WNW 9 | WSW 7 | WNW 8 | WSW 6 | E 3 | W 12 | SW 6 | SW 6 | — | WNW 12 | — | WNW 5 | — | — | W 9 | ENE 3 | WSW 8 | WNW 7 |
| kJ | 1 | 2 | 31 | 32 | 19 | 28 | 4 | 2 | 25 | 1 | 1 | — | 50 | — | 37 | — | — | 55 | 1 | 12 | 11 |
Swell 3 Height (m) Direction Period (s) | WSW 6 | W 8 | WSW 7 | WNW 4 | — | SW 7 | WNW 10 | WSW 6 | NNW 3 | SW 6 | — | — | — | — | — | — | — | — | — | ENE 3 | — |
| kJ | 4 | 1 | 27 | 1 | — | 12 | 10 | 4 | 1 | 1 | — | — | — | — | — | — | — | — | — | 1 | — |
Wind waves Height (m) Direction Period (s) | — | W 3 | NW 5 | — | WNW 2 | NE 4 | ENE 4 | — | NW 3 | E 3 | WSW 6 | WNW 3 | WNW 3 | WNW 3 | N 4 | NW 5 | NW 4 | NE 3 | NE 3 | — | N 3 |
| kJ | — | 4 | 26 | — | 1 | 10 | 11 | — | 1 | 3 | 3 | 2 | 1 | 3 | 6 | 8 | 4 | 2 | 3 | — | 8 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 90 | 437 | 30 | 90 | 343 | 108 | 119 | 436 | 90 | 0 | 157 | 36 | 73 | 158 | 36 | 28 | 90 | 28 | 90 | 158 | 101 |
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.
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