Surf Forecasts:
Belle Ile surf forecast from 13 Aug 2026:
- Most powerful swell: Friday 14 Aug, 2AM (local time) - 4ft (1.2m), 10s period, WNW swell with 294 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 1.2m 10s and forecast to arrive on Friday (Aug 14) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Monday (Aug 17) at 2AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Fri 14th Aug) | 4ft (1.2m) 10s |
Table - best surf conditions forecast for Belle Ile over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what Belle Ile has in store for us over the next couple of weeks.
Right off the bat, I gotta be straight with you – this is a tough stretch. The forecast is a long, dry spell of nothing but poor surf conditions. From now until the 19th of August, there’s basically no surf worth paddling out for. The swell is small, the winds are mostly onshore or cross-onshore, and the water’s just a mess of chop and lumpy conditions. It’s a real bummer.
We’ve got a bit of a glimmer on the morning of Thursday, the 20th of August. The swell jumps up to 6 ft from the WNW with a period of 11 seconds, giving us a solid kick of energy (771). The wind is a clean cross-offshore from the NNE, which is a major positive. This is the one standout in the whole window. Belle Ile is an exposed spot, so that 6 ft groundswell will be pushing in with some real power. However, at that size, it’s going to be a bit much for beginners – this is more of a session for the experienced crew. The water temp is sitting at 68°, which is about average for this time of year. The downside? That clean morning window is short-lived. By Thursday afternoon, the wind swings onshore and strong, wrecking it.
After that, the rest of the 16-day run is a write-off again. The swell drops back down, and we’re looking at onshore winds and poor conditions through the end of August. The swell tries to build again on the 27th with an 8 ft WSW swell, but it’s accompanied by strong onshore winds and a short period of 8 seconds. That’s a big, messy, blown-out wall of water – more interesting for the kite surfers than anyone on a paddle board.
So, to be honest, if you’re hanging for a wave, keep your eyes on the morning of Thursday, the 20th of August. That’s your best bet. Everything else is a waiting game.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Thu afternoon, min 18°C on Fri night). Winds increasing (light winds from the NW on Thu morning, fresh winds from the WNW by Fri night). | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Sun night, min 17°C on Sun morning). Winds decreasing (strong winds from the WNW on Mon night, light winds from the NW by Tue morning). | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | W 10 | W 11 | WNW 10 | W 9 | WNW 9 | W 9 | WNW 8 | W 8 | WNW 8 | WNW 8 | WNW 7 | WNW 7 | NW 7 | WNW 7 | WNW 6 | WNW 8 | WNW 8 | NW 5 | W 7 | W 7 | WNW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 188 | 220 | 294 | 142 | 211 | 76 | 153 | 134 | 159 | 64 | 62 | 75 | 21 | 26 | 42 | 20 | 49 | 22 | 28 | 17 | 31 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross | cross | on | cross | cross | on | cross-off | cross | on | cross-off | cross-off | on | cross | cross-on | on | cross | cross-on | on | cross |
High Tide | 6:10PM4.59m | 6:34AM4.26m | 6:49PM4.60m | 7:11AM4.23m | 7:27PM4.47m | 7:47AM4.10m | 8:03PM4.24m | 8:21AM3.91m | 8:37PM3.92m | 8:55AM3.67m | 9:12PM3.58m | 9:30AM3.40m | 9:51PM3.24m | ||||||||
Low Tide | 11:50AM0.01m | 00:20AM-0.18m | 12:33PM-0.07m | 1:01AM-0.16m | 1:14PM-0.03m | 1:41AM-0.02m | 1:55PM0.13m | 2:20AM0.22m | 2:35PM0.38m | 2:59AM0.54m | 3:17PM0.69m | 3:40AM0.88m | 4:04PM1.03m | 4:28AM1.21m | |||||||
 | |  | | |  |  | | | | | | | | | | | | | |  | |
 | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:11 | — | — | 7:11 | — | — | 7:13 | — | — |
 | — | — | 9:29 | — | — | 9:27 | — | — | 9:24 | — | — | 9:22 | — | — | 9:22 | — | — | 9:20 | — | — | 9:17 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 27 | 28 | 28 | 20 | 26 | 27 | 20 | 22 | 25 | 18 | 22 | 25 | 19 | 23 | 24 | 18 | 21 | 23 | 20 | 20 | 21 |
Feels °C | 25 | 24 | 23 | 18 | 21 | 21 | 19 | 19 | 22 | 16 | 18 | 21 | 17 | 18 | 18 | 17 | 18 | 21 | 21 | 21 | 17 |
Swell 1 Height (m) Direction Period (s) | W 10 | W 11 | WNW 10 | W 9 | — | W 9 | WNW 8 | W 8 | WNW 8 | WNW 8 | — | WNW 7 | NW 7 | W 11 | WNW 6 | WNW 8 | WNW 8 | NW 5 | W 7 | W 7 | WNW 6 |
| kJ | 188 | 220 | 294 | 142 | — | 76 | 153 | 32 | 159 | 64 | — | 75 | 21 | 2 | 42 | 20 | 21 | 22 | 28 | 17 | 31 |
Swell 2 Height (m) Direction Period (s) | WNW 12 | — | — | — | — | W 11 | — | — | — | — | — | — | W 7 | W 11 | WNW 9 | WNW 4 | — | W 8 | NW 6 | NW 9 | W 7 |
| kJ | 29 | — | — | — | — | 2 | — | — | — | — | — | — | 4 | 2 | 8 | 2 | — | 18 | 5 | 3 | 16 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 11 | — | — | — | — | — | — | — | W 11 | W 10 | — | — | — | W 9 | W 10 | WNW 9 |
| kJ | — | — | — | — | — | 2 | — | — | — | — | — | — | — | 2 | 2 | — | — | — | 2 | 2 | 8 |
Wind waves Height (m) Direction Period (s) | WNW 3 | WNW 3 | NW 5 | NW 4 | WNW 9 | NW 6 | — | W 8 | NNE 3 | NNE 3 | WNW 7 | NE 4 | NE 3 | WNW 7 | NE 3 | — | WNW 8 | NNW 5 | — | NW 6 | NNE 4 |
| kJ | 1 | 2 | 32 | 7 | 211 | 58 | — | 134 | 4 | 2 | 62 | 15 | 2 | 26 | 5 | — | 49 | 17 | — | 10 | 8 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 158 | 29 | 29 | 158 | 36 | 36 | 158 | 36 | 31 | 435 | 426 | 144 | 435 | 48 | 90 | 445 | 48 | 108 | 348 | 44 |
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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