Surf Forecasts:
Belle Ile surf forecast from 16 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 8PM (local time) - 5.5ft (1.7m), 9s period, WNW swell with 495 kJ wave energy.
Best Forecast Surf Conditions for Belle Ile this week:
The most powerful waves expected at Belle Ile in the next 16 days are 1.7m 9s and forecast to arrive on Thursday (Aug 20) 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 Sunday (Aug 23) at 2PM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Thu 20th Aug) | 5.5ft (1.7m) 9s |
Table - best surf conditions forecast for Belle Ile over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s cookin’ for Belle Ile over the next couple of weeks.
Right off the bat, I gotta be honest with you – the first week is a bit of a write-off. We’ve got weak, small energy and onshore winds that just won’t quit. The water temp is sitting at 69°, which is a touch warmer than normal for this time of year, so at least the swim will be nice.
The real story starts to shape up later. The first few days barely register a pulse, with swell energy in the 60s and 30s. Tuesday the 20th sees a bit of a bump with wave heights around 5 ft to 6 ft from the WNW, but the wind is all over it – onshore and fresh, so it’s blown out. That energy is moderate though, hitting 321-466, but it’s not gonna be pretty.
We hit a real dry spell from the 22nd through the 25th – tiny waves, energy dropping down to single digits some days. Not worth paddling out for.
Now, here’s the glimmer. Look ahead to Saturday the 29th of August. The morning is the standout. We’ve got a clean 6 ft swell rolling in from the WNW, with a period of 9 seconds. That’s a solid, moderate groundswell with some punch. The wind is light offshore from the east, keeping things glassy and clean. Combined energy is a strong 463. This is the one to circle on the calendar. Belle Ile should be offering up some proper waves. The only catch? It’s a long-range call, so keep an eye on it, but the signs are promising.
Monday the 31st also looks good in the morning. Another 5 ft swell from the west, clean offshore winds from the ESE, and energy of 314. Good surf conditions again. The afternoon fills in a bit bigger at 6 ft, but the wind swings onshore, so get out early.
So, overall, a slow start, but patience pays off. The last weekend of August into September is where the magic’s hiding.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Sun night, min 16°C on Mon morning). Winds increasing (light winds from the NNE on Sun morning, strong winds from the WNW by Mon night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Wed afternoon, min 14°C on Fri night). Winds decreasing (fresh winds from the WNW on Thu night, light winds from the NW by Fri morning). | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 8 | WNW 7 | NW 7 | NNW 4 | WNW 4 | NW 5 | WNW 7 | W 8 | NW 4 | WNW 6 | WNW 7 | WNW 9 | WNW 8 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | W 8 | NW 8 | W 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 64 | 62 | 88 | 10 | 21 | 35 | 27 | 48 | 26 | 28 | 77 | 268 | 306 | 466 | 367 | 222 | 153 | 86 | 34 | 36 | 31 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | on | cross-off | cross | on | cross | cross-on | on | cross-on | cross-on | on | cross-on | on | on | cross-on | cross-on | on | cross-off | cross | on | cross-off |
High Tide | 8:03PM4.24m | 8:21AM3.91m | 8:37PM3.92m | 8:55AM3.67m | 9:12PM3.58m | 9:30AM3.40m | 9:51PM3.24m | 10:13AM3.14m | 10:42PM2.93m | 11:18AM2.91m | 00:19AM2.73m | 1:22PM2.84m | 2:25AM2.79m | ||||||||
Low Tide | 1:55PM0.13m | 2:20AM0.22m | 2:35PM0.38m | 2:59AM0.54m | 3:17PM0.69m | 3:40AM0.88m | 4:04PM1.03m | 4:28AM1.21m | 4:59PM1.33m | 5:28AM1.48m | 6:12PM1.53m | 6:45AM1.61m | 7:35PM1.54m | ||||||||
 | |  | | | | | | |  | |  |  | | | | | | | |  | |
 | 7:09 | — | — | 7:11 | — | — | 7:11 | — | — | 7:13 | — | — | 7:15 | — | — | 7:16 | — | — | 7:16 | — | — |
 | — | — | 9:22 | — | — | 9:22 | — | — | 9:20 | — | — | 9:17 | — | — | 9:15 | — | — | 9:15 | — | — | 9:13 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 23 | 25 | 17 | 22 | 23 | 17 | 19 | 20 | 17 | 19 | 18 | 18 | 18 | 18 | 17 | 18 | 19 | 14 | 17 | 20 |
Feels °C | 20 | 22 | 20 | 15 | 17 | 17 | 17 | 16 | 17 | 15 | 15 | 13 | 14 | 13 | 11 | 15 | 16 | 13 | 10 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | WNW 8 | — | NW 7 | WNW 7 | WNW 10 | WNW 8 | WNW 7 | W 8 | W 8 | W 7 | WNW 10 | — | W 9 | — | WNW 9 | WNW 9 | W 9 | WNW 9 | W 8 | W 8 | W 10 |
| kJ | 64 | — | 88 | 4 | 10 | 22 | 27 | 5 | 11 | 16 | 38 | — | 15 | — | 367 | 222 | 25 | 86 | 34 | 12 | 31 |
Swell 2 Height (m) Direction Period (s) | NNE 3 | — | — | W 7 | — | WNW 8 | W 9 | — | — | NW 11 | — | — | — | — | — | W 10 | W 9 | W 9 | NW 8 | W 11 | WNW 7 |
| kJ | 1 | — | — | 4 | — | 14 | 6 | — | — | 4 | — | — | — | — | — | 45 | 26 | 24 | 15 | 20 | 9 |
Swell 3 Height (m) Direction Period (s) | — | — | — | W 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | W 12 | W 11 | — | WNW 4 |
| kJ | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 10 | — | 1 |
Wind waves Height (m) Direction Period (s) | NE 3 | WNW 7 | NNE 3 | NNW 4 | WNW 4 | NW 5 | NW 4 | W 8 | NW 4 | WNW 6 | WNW 7 | WNW 9 | WNW 8 | WNW 9 | WNW 9 | — | WNW 9 | NE 3 | NE 3 | NW 8 | NNE 3 |
| kJ | 1 | 62 | 3 | 10 | 21 | 35 | 4 | 48 | 26 | 28 | 77 | 268 | 306 | 466 | 254 | — | 153 | 5 | 2 | 36 | 8 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 435 | 29 | 147 | 435 | 90 | 90 | 684 | 498 | 158 | 684 | 45 | 158 | 432 | 44 | 36 | 435 | 36 | 29 | 426 | 33 |
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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