Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 18 Sep 2026:
- Best quality surf: Wednesday 23 Sep, 5PM (local time) - 5ft (1.5m), 14s period, W swell with glassy winds.
- Most powerful swell: Friday 18 Sep, 11AM (local time) - 6ft (1.9m), 16s period, WNW swell with 1,730 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 11AM (local time) - 4.5ft (1.3m), 11s 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 Sunday (Sep 20) at 11AM. The primary swell is predicted to be 1.3m and 11s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Belle Ile - Les Donnants in the next 16 days are 1.9m 16s and forecast to arrive on Friday (Sep 18) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Thursday (Sep 24) at 5AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Sun 20th Sep) | 4.5ft (1.3m) 11s |
| Best Surf | 5PM (Wed 23rd Sep) | 5ft (1.5m) 14s |
| Most Powerful | 11AM (Fri 18th Sep) | 6ft (1.9m) 16s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
Short Range ForecastMostly dry. Warm (max 21°C on Sun night, min 16°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Tue night, min 18°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | |||||||||||||||
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 16 | WNW 14 | WNW 13 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | W 16 | W 14 | W 13 | WNW 12 | WNW 12 | WNW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1730 | 1173 | 594 | 452 | 401 | 408 | 373 | 373 | 380 | 275 | 285 | 242 | 138 | 167 | 202 | 243 | 944 | 787 | 432 | 298 | 210 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross-on | on | cross-on | cross-off | on | cross-off | cross-off | glassy | cross-off | off | glassy | cross-off | off | glassy | cross-off | off | glassy | cross-off |
High Tide | 9:20AM3.19m | 9:47PM2.90m | 10:17AM2.91m | 11:10PM2.66m | 12:23PM2.77m | 1:54AM2.69m | 2:22PM2.95m | 2:58AM2.94m | 3:12PM3.25m | 3:37AM3.23m | 3:47PM3.56m | 4:08AM3.53m | 4:18PM3.86m | 4:38AM3.81m | |||||||
Low Tide | 4:16PM1.38m | 4:41AM1.57m | 5:31PM1.60m | 6:05AM1.70m | 7:03PM1.61m | 7:33AM1.60m | 8:19PM1.40m | 8:38AM1.35m | 9:12PM1.10m | 9:25AM1.03m | 9:52PM0.77m | 10:04AM0.72m | 10:27PM0.46m | ||||||||
 | |  |  | | | | | | | | | | | | | |  | | | | |
 | 7:52 | — | — | 7:54 | — | — | 7:56 | — | — | 7:56 | — | — | 7:58 | — | — | 8:00 | — | — | 8:00 | — | — |
 | — | 8:20 | — | — | 8:17 | — | — | 8:15 | — | — | 8:14 | — | — | 8:12 | — | — | 8:08 | — | — | 8:07 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 16 | 17 | 17 | 17 | 17 | 19 | 21 | 19 | 24 | 25 | 20 | 26 | 27 | 21 | 26 | 26 | 21 | 26 | 27 |
Feels °C | 14 | 15 | 12 | 15 | 15 | 15 | 17 | 17 | 20 | 16 | 24 | 22 | 14 | 25 | 24 | 17 | 26 | 21 | 16 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | WNW 16 | WNW 14 | WNW 13 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | W 14 | W 13 | WNW 12 | WNW 12 | WNW 11 |
| kJ | 1730 | 1173 | 594 | 452 | 401 | 408 | 373 | 373 | 380 | 275 | 285 | 242 | 138 | 167 | 202 | 187 | 944 | 787 | 432 | 298 | 210 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | ESE 4 | — | — | SE 4 | W 18 | W 16 | W 10 | — | — | ESE 3 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 2 | — | — | 4 | 7 | 243 | 133 | — | — | 4 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | NE 3 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NE 2 | E 4 | — | NE 3 | E 4 | — | E 3 | E 3 | — | NNE 3 | ENE 4 | — | — |
| kJ | — | — | — | — | — | — | — | — | 1 | 9 | — | 3 | 9 | — | 5 | 6 | — | 8 | 14 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 36 | 148 | 44 | 101 | 101 | 36 | 0 | 87 | 28 | 20 | 0 | 28 | 0 | 0 | 28 | 0 | 0 | 28 | 0 | 0 | 28 |
Best forecast wave conditions in Morbihan - Brittany | |||||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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