
Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 15 Jul 2026:
- Best quality surf: Wednesday 15 Jul, 11PM (local time) - 3ft (0.9m), 5s period, WNW swell with offshore winds.
- Most powerful swell: Thursday 16 Jul, 8PM (local time) - 2.5ft (0.8m), 8s period, W swell with 90 kJ wave energy.
- Next surfable swell (1★+): Wednesday 15 Jul, 11PM (local time) - 3ft (0.9m), 5s period with WNW 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 (Jul 15) at 11PM. The primary swell is predicted to be 0.9m and 5s period with a secondary swell of 0.4m and 9s. 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 0.8m 8s and forecast to arrive on Thursday (Jul 16) 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 1.0m 4s period and expected on Wednesday (Jul 22) at 2AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 15th Jul) | 3ft (0.9m) 5s |
| Best Surf | 11PM (Wed 15th Jul) | 3ft (0.9m) 5s |
| Most Powerful | 8PM (Thu 16th Jul) | 2.5ft (0.8m) 8s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Right, let’s have a look at what’s on the cards for our slice of the Atlantic.
This is a tough stretch, plain and simple. Truth be told, this 16-day outlook is a write-off for any proper paddle surfing. We’ve got a long, dry gap here with no decent waves on offer, so don’t be holding your breath for a session. The first bit of any real swell energy doesn’t show up until the very end, and even then, the conditions are a mess.
Let’s start with Belle Ile - Les Donnants (river). This spot is normally a reliable little river mouth, but for the next two and a half weeks, it’s just not happening. The water temperature is sitting at 71°, which is a massive 7° warmer than usual for this time of year – that’s very unusual, mind you. Right now, on Wednesday afternoon, there’s a wobbly, weak 3 ft swell from the west, with a short period of 9 seconds, and a cross-on shore wind of 19 mph is churning it up. The combined swell energy is a paltry 108 (weak), and it’s just poor.
The next few days are flat as a pancake with tiny dribbles under 2 ft and periods of 7 to 8 seconds. The wind does swing offshore or clean out of the ENE a few times on Thursday, Friday, and Sunday mornings, but with swell heights barely reaching 1.0 ft and combined energy in the teens or twenties, there’s nothing to push you down the line. It’s a nice looking ocean, but wave-less.
The pattern keeps up: wee bits of swell from the west-northwest, but always too small and too weak. The morning of Tuesday the 21st has a clean offshore wind, but the swell is a feeble 1.0 ft. Not worth paddling out for.
We don't see any real energy until the 26th of July, a Sunday, where the swell picks up to 2 ft from the west with a period of 11 seconds and combined energy at 57 – still weak, and the wind is cross-on from the northwest. By the 28th of July, a Tuesday, we get a spike of energy with a 5 ft swell from the west, but the period is super short at 5 seconds, and it’s blowing a strong onshore 28 mph out of the west-northwest. The combined energy hits 119 (moderate), but with that kind of wind and a jumbled up short-period sea, it’s not surfable for a board. That setup looks far more interesting for a kite surfer than us paddle folk.
And the final day, the 30th, shows a similar story – a 4 ft swell from the west-northwest with a shocking 5-second period and onshore wind. All 0/10 scores here. There is no standout session in this entire window. The river mouth will be flat and clean, but empty.
It’s a blank run, lads. This area can have proper long gaps like this, and unfortunately, this is one of them. Forecasts can change, but right now, it’s a time to wax the longboard and wait.
- Rusty
Short Range ForecastSome drizzle, heaviest during Thu night. Warm (max 25°C on Wed afternoon, min 19°C on Thu morning). Winds decreasing (fresh winds from the WNW on Wed afternoon, calm by Thu night). | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Sat night, min 17°C on Sun night). Winds increasing (light winds from the W on Sat afternoon, strong winds from the NE by Sun night). | ||||||||||||||||||||
Wed 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | W 9 | W 5 | WSW 8 | W 7 | W 4 | W 8 | W 5 | W 8 | W 8 | W 9 | WNW 8 | WNW 8 | NW 7 | WNW 7 | W 9 | W 12 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 |
Wave Graph | |||||||||||||||||||||
108 | 15 | 23 | 21 | 38 | 13 | 12 | 12 | 12 | 13 | 13 | 11 | 9 | 5 | 6 | 11 | 12 | 22 | 20 | 19 | 18 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | off | cross-off | on | glassy | cross-off | on | cross-off | cross-off | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-off | off | on | cross-off | cross-off |
High Tide | 6:23PM4.52m | 6:52AM4.18m | 7:10PM4.54m | 7:36AM4.11m | 7:54PM4.43m | 8:20AM3.96m | 8:38PM4.21m | 9:03AM3.76m | 9:21PM3.92m | 9:46AM3.53m | 10:06PM3.59m | 10:33AM3.31m | 10:56PM3.29m | 11:29AM3.12m | |||||||
Low Tide | 00:38AM-0.11m | 12:53PM0.04m | 1:25AM-0.09m | 1:39PM0.09m | 2:11AM0.04m | 2:24PM0.24m | 2:56AM0.26m | 3:10PM0.47m | 3:42AM0.54m | 3:58PM0.74m | 4:29AM0.83m | 4:50PM1.01m | 5:21AM1.10m | ||||||||
— | — | 6:31 | — | — | 6:33 | — | — | 6:33 | — | — | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — | 6:37 | |
— | 10:05 | — | — | 10:05 | — | — | 10:04 | — | — | 10:02 | — | — | 10:01 | — | — | 10:00 | — | — | 10:00 | 9:59 | |
mm | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 20 | 22 | 22 | 19 | 22 | 24 | 22 | 25 | 28 | 21 | 28 | 26 | 19 | 24 | 26 | 19 | 26 | 26 | 19 |
Feels °C | 20 | 24 | 22 | 20 | 21 | 20 | 20 | 20 | 19 | 24 | 23 | 15 | 24 | 18 | 13 | 20 | 20 | 15 | 22 | 19 | 14 |
Swell 1 Height (m) Direction Period (s) | — | W 5 | WSW 8 | W 8 | W 9 | SW 5 | W 8 | SW 4 | W 8 | W 9 | WNW 4 | WNW 8 | ESE 4 | WNW 7 | W 9 | ESE 4 | WNW 5 | WNW 11 | ESE 4 | WNW 10 | WNW 10 |
— | 15 | 23 | 12 | 14 | 7 | 12 | 4 | 12 | 13 | 8 | 11 | 5 | 5 | 6 | 2 | 9 | 22 | 7 | 19 | 18 | |
Swell 2 Height (m) Direction Period (s) | — | W 9 | WNW 4 | — | — | W 8 | — | W 8 | WNW 4 | E 3 | WNW 8 | WNW 5 | NW 7 | W 7 | NW 7 | W 8 | WNW 11 | WNW 5 | WNW 10 | NW 6 | — |
— | 14 | 1 | — | — | 13 | — | 12 | 2 | 1 | 13 | 3 | 9 | 4 | 2 | 5 | 12 | 3 | 20 | 1 | — | |
Swell 3 Height (m) Direction Period (s) | — | W 11 | W 10 | W 10 | — | — | — | WNW 5 | SW 4 | SW 4 | NW 9 | W 11 | W 8 | W 10 | W 12 | W 12 | W 8 | W 8 | NW 6 | — | — |
— | 2 | 2 | 2 | — | — | — | 2 | 1 | 1 | 3 | 2 | 4 | 2 | 3 | 11 | 5 | 1 | 1 | — | — | |
Wind waves Height (m) Direction Period (s) | W 9 | E 3 | ENE 3 | W 7 | W 4 | WNW 4 | W 5 | NNE 3 | NE 4 | NW 2 | NNE 3 | E 4 | E 4 | ENE 4 | E 4 | NW 7 | NE 4 | E 4 | NE 3 | NE 4 | ENE 4 |
108 | 3 | 4 | 21 | 38 | 7 | 12 | 5 | 6 | 2 | 8 | 28 | 11 | 21 | 21 | 7 | 13 | 20 | 3 | 35 | 19 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 525 | 356 | 338 | 614 | 0 | 407 | 356 | 1857 | 582 | 717 | 864 | 139 | 364 | 356 | 424 | 426 | 377 | 139 | 356 | 356 | 374 |
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.











