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Belle Ile - Les Donnants Surf Forecast
/ Brittany – Morbihan (22 surf breaks) /
Surf Forecasts:
Belle Ile - Les Donnants surfForecast / Brittany – Morbihan / France
12 Day Weather and Surf, issued 1 pm Wednesday 17 Sep 2025 CEST
Best Forecast Surf Conditions for Belle Ile - Les Donnants this week:
The surf forecast for Belle Ile - Les Donnants over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 18) at 11AM. The primary swell is predicted to be 2.0m and 12s 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 12 days are 2.1m 12s and forecast to arrive on Thursday (Sep 18) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Monday (Sep 22) at 8AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Thu 18th Sep) | 6.5ft (2.0m) 12s |
| Best Surf | 11AM (Thu 18th Sep) | 6.5ft (2.0m) 12s |
| Most Powerful | 5AM (Thu 18th Sep) | 7ft (2.1m) 12s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 12 days.
Short Range Forecast Mostly dry. Warm (max 20°C on Thu night, min 16°C on Wed afternoon). Wind will be generally light. | Days 3-6 Weather Summary Light rain (total 8mm), mostly falling on Tue morning. Very mild (max 19°C on Sat afternoon, min 13°C on Mon morning). Winds decreasing (fresh winds from the WNW on Sat night, light winds from the WSW by Mon night). | ||||||||||||||||||||||
Wed 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |||
Rating (10 max) | |||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||||
| Period(s) (?) | 10 | 12 | 12 | 12 | 11 | 10 | 10 | 10 | 9 | 6 | 8 | 8 | 9 | 10 | 9 | 8 | 6 | 4 | 6 | 14 | 13 | ||
Wave (?)Graph  | |||||||||||||||||||||||
 kJ (?) | 332 | 1098 | 1141 | 872 | 595 | 386 | 379 | 312 | 205 | 305 | 266 | 287 | 541 | 200 | 19 | 10 | 11 | 9 | 19 | 16 | 52 | ||
Wind (km/h) | |||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- off | cross | cross- off | cross- off | cross | cross- on | cross | on | on | on | on | on | on | on | on | cross- off | cross- off | cross | cross | ||
High Tide / height (m) | 2:48PM 3.43 | 3:27AM 3.37 | 3:43PM 3.72 | 4:12AM 3.62 | 4:26PM 3.97 | 4:49AM 3.83 | 5:01PM 4.15 | 5:20AM 3.98 | 5:31PM 4.24 | 5:48AM 4.08 | 5:59PM 4.27 | 6:14AM 4.11 | 6:25PM 4.22 | 6:39AM 4.09 | |||||||||
Low Tide / height (m) | 8:45PM 0.97 | 9:05AM 0.99 | 9:41PM 0.69 | 9:55AM 0.70 | 10:24PM 0.43 | 10:36AM 0.45 | 11:01PM 0.24 | 11:12AM 0.26 | 11:34PM 0.13 | 11:46AM 0.16 | 12:06AM 0.10 | 12:19PM 0.15 | 12:38AM 0.17 | 12:52PM 0.22 | |||||||||
Wed 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||||||
| Sunrise | - | - | 7:52 | - | - | 7:54 | - | - | 7:56 | - | - | 7:56 | - | - | 7:58 | - | - | 8:00 | - | - | 8:00 | ||
| Sunset | 8:22 | - | - | 8:20 | - | - | 8:17 | - | - | 8:15 | - | - | 8:14 | - | - | 8:12 | - | - | 8:08 | - | - | ||
 |  | | | |  | |  |  | |  | | | | |  |  | | | | | |||
Rain (mm) | - | - | - | - | - | - | - | - | - | - | 1 | - | - | - | - | 2 | 3 | 2 | - | - | - | ||
| Temp. °C | 16 | 16 | 16 | 17 | 20 | 20 | 20 | 20 | 18 | 19 | 16 | 16 | 16 | 14 | 14 | 15 | 15 | 14 | 17 | 15 | 14 | ||
| Feels °C (?) | 14 | 15 | 16 | 17 | 16 | 15 | 20 | 20 | 16 | 17 | 11 | 9 | 10 | 9 | 9 | 9 | 10 | 12 | 11 | 7 | 9 | ||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Brittany - Morbihan
The wind is still cross-on at Belle Ile - Les Donnants (light winds from the WSW at Le Talut 4 km from Belle Ile - Les Donnants). 0.9m 9s swell from the W with a 0.5m 3s local chop from the SSW and a 0.3m 10s swell from the W. 3 swells combining to make bigger set waves.
Actual: 55 min ago
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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 12 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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