Surf Forecasts:
Belle Ile surf forecast from 14 Sep 2026:
- Best quality surf: Monday 21 Sep, 2PM (local time) - 4.5ft (1.3m), 13s period, WNW swell with offshore winds.
- Most powerful swell: Friday 18 Sep, 11AM (local time) - 6ft (1.9m), 16s period, WNW swell with 1,774 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 2PM (local time) - 3ft (0.9m), 9s period with WNW swell.
Best Forecast Surf Conditions for Belle Ile this week:
The surf forecast for Belle Ile over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 14) at 2PM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.6m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Belle Ile 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 0.6m 3s period and expected on Monday (Sep 21) at 5AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Mon 14th Sep) | 3ft (0.9m) 9s |
| Best Surf | 2PM (Mon 21st Sep) | 4.5ft (1.3m) 13s |
| Most Powerful | 11AM (Fri 18th Sep) | 6ft (1.9m) 16s |
Table - best surf conditions forecast for Belle Ile over the next 16 days.
The Lowdown
Alright, let's get into it. We're talkin' Belle Ile, and honestly, the first chunk of this forecast is a grind. The water’s running about 67°, which is a touch warmer than usual for this time of year, but that's where the good news kinda stalls.
The first few days are a washout. Monday morning, September 14th, has a tiny 3ft WNW swell with clean conditions and a light offshore breeze, but the energy is weak, only 162. That’s the only semi-rideable moment in a long stretch of poor surf that goes all the way through the rest of the week. Onshore winds, chop, and messy conditions are the theme. By Wednesday afternoon, the swell jumps to about 6ft, but it’s getting hammered by a fresh onshore wind at 22 mph – blown out, no good.
The real window opens around Sunday, September 20th. The morning brings a clean 4ft WNW swell with a light cross-offshore breeze from the NE at 6 mph. It’s not huge, but it’s clean, and the energy is moderate at 252. You could get some long, clean rides if you find the right bank.
But the absolute standout – the one you wait for – is Monday, September 21st. The morning session serves up a 4ft WNW groundswell with a 14-second period, coming from the ideal SW direction for Belle Ile. Wind is a clean offshore from the ENE at 16 mph. The combined energy is strong at 615. Then, in the afternoon, it gets even better – the wind goes dead glassy, 0 mph from the NNW, and the swell holds at a clean 4ft with a 13-second period. That afternoon on Monday the 21st is the best of the whole 16 days. Clean, long-period swell, glassy conditions, and the break is fairly consistent. Crowds are sometimes a thing here, so expect some company, but for that kind of quality, you deal with it.
After that, the surf slowly fades. Tuesday the 22nd has small but clean waves, and by Wednesday the 23rd, it’s weak again. The following weekend into the next week (September 28-29) shows a few pulses of 4ft swell with longer periods, but the winds turn onshore again, making it messy.
So, the first several days are a bust. But the 21st of September – especially the afternoon – is the one to circle on the calendar. For beginners, the good days stay under 5ft, so it’s friendly. The long-period swells (14-16 seconds) are better for points and reefs, but Belle Ile can still handle it.
Hang tight and score that Monday.
Rusty
Short Range ForecastMostly dry. Warm (max 22°C on Mon night, min 15°C on Tue night). Winds increasing (calm on Mon afternoon, fresh winds from the NW by Tue night). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Thu night. Very mild (max 18°C on Sat morning, min 16°C on Thu morning). Winds decreasing (fresh winds from the WNW on Thu night, light winds from the N by Sat night). | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 10 | W 9 | W 9 | W 8 | W 11 | WNW 10 | WNW 10 | WNW 10 | WNW 11 | WNW 10 | W 10 | WNW 9 | WNW 16 | WNW 14 | WNW 13 | WNW 12 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 157 | 106 | 76 | 69 | 61 | 386 | 416 | 551 | 551 | 363 | 500 | 406 | 1774 | 1360 | 692 | 514 | 387 | 308 | 246 | 232 | 292 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | on | cross-on | cross-on | cross-on | cross-on | cross | on | cross | on | on | cross-on | cross-on | on | on | on | on | cross-on | cross-off | on | cross-off |
High Tide | 7:26PM4.16m | 7:40AM4.00m | 7:56PM3.87m | 8:10AM3.76m | 8:27PM3.55m | 8:42AM3.48m | 9:02PM3.22m | 9:20AM3.19m | 9:47PM2.90m | 10:17AM2.91m | 11:10PM2.66m | 12:23PM2.77m | 1:54AM2.69m | ||||||||
Low Tide | 1:23PM0.13m | 1:43AM0.28m | 2:00PM0.38m | 2:18AM0.60m | 2:39PM0.70m | 2:56AM0.94m | 3:22PM1.05m | 3:41AM1.28m | 4:16PM1.38m | 4:41AM1.57m | 5:31PM1.60m | 6:05AM1.70m | 7:03PM1.61m | ||||||||
 | |  |  | |  | | | | |  |  | | | | | | | | | | |
 | 7:48 | — | — | 7:48 | — | — | 7:50 | — | — | 7:52 | — | — | 7:52 | — | — | 7:54 | — | — | 7:56 | — | — |
 | — | 8:28 | — | — | 8:25 | — | — | 8:23 | — | — | 8:22 | — | — | 8:20 | — | — | 8:17 | — | — | 8:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 21 | 22 | 18 | 19 | 19 | 15 | 18 | 18 | 17 | 17 | 17 | 16 | 17 | 17 | 18 | 18 | 18 | 16 | 20 | 21 |
Feels °C | 17 | 20 | 20 | 16 | 16 | 12 | 11 | 11 | 11 | 13 | 12 | 11 | 13 | 14 | 15 | 17 | 17 | 17 | 15 | 18 | 17 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | W 9 | W 9 | W 8 | W 8 | W 10 | WNW 10 | WNW 10 | WNW 11 | WNW 10 | WNW 10 | WNW 9 | WNW 16 | WNW 14 | WNW 13 | WNW 12 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 |
| kJ | 157 | 106 | 76 | 69 | 34 | 125 | 416 | 551 | 551 | 363 | 223 | 406 | 1774 | 1360 | 692 | 514 | 387 | 308 | 246 | 232 | 176 |
Swell 2 Height (m) Direction Period (s) | NW 11 | NW 9 | WNW 10 | WNW 12 | W 11 | — | — | — | — | — | — | W 17 | W 16 | — | — | — | — | — | W 18 | W 16 | WNW 15 |
| kJ | 5 | 22 | 9 | 14 | 61 | — | — | — | — | — | — | 5 | 422 | — | — | — | — | — | 6 | 46 | 292 |
Swell 3 Height (m) Direction Period (s) | — | — | W 13 | NW 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 4 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | NW 3 | NW 4 | WNW 10 | — | WNW 10 | — | — | W 10 | — | — | — | — | — | — | NNW 2 | — | — | NE 3 |
| kJ | — | — | — | 1 | 23 | 386 | — | 394 | — | — | 500 | — | — | — | — | — | — | 1 | — | — | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 90 | 29 | 90 | 158 | 44 | 44 | 44 | 29 | 156 | 202 | 36 | 36 | 148 | 44 | 87 | 144 | 29 | 0 | 82 | 29 |
Best forecast wave conditions in Morbihan - Brittany | |||||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||||
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Information about the Belle Ile Surf forecast
The above surf forecast table for Belle Ile 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 can be found by selecting the local surf guide option on the grey menu. Our Belle Ile 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) 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 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 is 48 km (30 miles) from the city of Ploemeur. If you plan a holiday in Morbihan - Brittany, look for hotels and other accommodation in Ploemeur. Ploemeur has rooms for a wide range of budgets as well as car hire and transport links.
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