Belle Ile - Les Donnants Surf Break

Lat Long: 47.32° N 3.24° W

Belle Ile - Les Donnants Surf Forecast and Surf Report

Issued: 1 pm 09 Aug 2026 (local time)

Forecast update in  hr  min

Today's Belle Ile - Les Donnants sea temperature is
19.4° C
0.3° 

Belle Ile - Les Donnants surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Belle Ile - Les Donnants surf forecast from 9 Aug 2026:

  • Best quality surf: Monday 10 Aug, 5AM (local time) - 1.5ft (0.4m), 9s period, WNW swell with cross-offshore winds.
  • Most powerful swell: Friday 14 Aug, 2AM (local time) - 4ft (1.2m), 10s period, WNW swell with 294 kJ wave energy.
  • Next surfable swell (1★+): Monday 10 Aug, 5AM (local time) - 1.5ft (0.4m), 9s 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 Monday (Aug 10) at 5AM. The primary swell is predicted to be 0.4m and 9s period with a secondary swell of 0.5m and 7s. Another secondary swell of 0.5m and 4s is also forecast. 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 1.2m 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 0.6m 4s period and expected on Tuesday (Aug 11) at 5AM.

Wave TypeTime (CEST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Mon 10th Aug)1.5ft (0.4m) 9s
Best Surf 5AM (Mon 10th Aug)1.5ft (0.4m) 9s
Most Powerful 2AM (Fri 14th Aug)4ft (1.2m) 10s

Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.


The Lowdown

Alright, folks, Rusty here. Let’s have a look at the next couple of weeks for Belle Ile - Les Donnants. I’ll be straight with you: it’s a slow start. We’ve got a lot of small, weak, and wind-blown days ahead before things finally line up.

The first few days are pretty much a write-off. The swell is tiny, mostly around 1ft, and the wind is all over the place, mostly onshore or cross. You’ll be staring at flat, bumpy water. It’s not worth paddling out for this. We’re looking at a gap of about three days with nothing to get excited about.

Things start to look a little more interesting on Wednesday the 12th. The swell bumps up to 2ft from the west with a 10-second period. The morning has a clean, light offshore wind (ESE at 10 km/h). It’s small, but it’s the first time we’ll see a clean face. The energy is still weak, though, sitting at 104. It’s a longboard kind of day, if anything. The afternoon gets ruined by an onshore breeze, so get your fix early.

The swell builds a bit through Thursday and Friday, reaching around 3ft, but the wind isn't doing us any favors. It’s cross-onshore or onshore, and the surface is going to be messy. The energy picks up – Thursday afternoon hits 270 – but it doesn’t matter if it’s blown out. Friday looks the same, with rain showers on the cards for the afternoon. Not worth the paddle.

The weekend brings a bit more size, around 3ft, but the wind stays onshore and fresh. Saturday afternoon has a 30 km/h onshore wind, which is just going to chop it up. The swell period also drops to 7-8 seconds, so it’s not going to have any punch. Forget it.

Monday the 17th sees a drop in swell, down to around 2-2ft, and while the morning has a clean cross-offshore breeze at 35 km/h, it’s just too small. The energy is weak, around 39. Tuesday and Wednesday are even smaller, dropping to a pathetic 0.7ft. The ocean is basically taking a nap.

There’s a little bump on Thursday the 20th back to 2ft, but again, it’s small and the wind is onshore again. Not much to talk about.

We finally get a bit of a pulse on Saturday the 22nd. The morning has a slight cross-offshore wind (ENE at 5 km/h) and a clean 3ft of west swell. The period is short, only 5 seconds, so it’ll be a bit crumbly, but it’s the first clean wave in a while. The energy is still weak at 66. It’s a small, clean day for the log.

Sunday the 23rd gets a bit bigger, with 4ft to 4ft of west swell, but the period is still short (6 seconds) and the wind is onshore again. It’s going to be a messy, bumpy 4ft. Not great.

Now, here’s the standout. Monday the 24th. The swell is around 4ft from the west with a proper 10-second period. The energy jumps up to 357, which is moderate. But the kicker is the wind: it’s glassy in the morning. A light NNE breeze at 5 km/h. That’s the day to be out there. Clean, lined-up, and with some real push behind it. It’s the best on offer in this whole stretch, no doubt. The afternoon drops back to an onshore breeze, so make the most of the morning.

So, to sum it up: this isn’t a wave-rich forecast. Most of the window is flat or blown out. There’s one clear standout on the 24th, and a small, clean option on the 22nd. The longer-range call for the 24th is promising, but a week out, treat it with a little caution. Fingers crossed it holds.

Rusty, signing off.

Short Range Forecast

Mostly dry. Warm (max 29°C on Tue afternoon, min 17°C on Sun night). Winds decreasing (fresh winds from the WNW on Sun night, calm by Wed morning).

Days 5-7 Weather Summary

Light rain (total 7mm), mostly falling on Fri afternoon. Warm (max 29°C on Wed night, min 18°C on Sat morning). Wind will be generally light.

Sun
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
WNW
9
0.4
WNW
9
0.4
WNW
9
0.4
WNW
9
0.4
WNW
8
0.4
WNW
8
0.4
WNW
8
0.3
W
12
0.7
W
10
0.8
W
10
0.8
W
9
0.9
W
10
1
W
11
1.2
WNW
10
1
W
9
1
W
9
1
WNW
6
0.9
WNW
8
1
WNW
8
0.9
WNW
5
Wave Graph
Metric surfscale
Energy kJ
32
31
32
30
28
26
26
25
102
123
109
146
224
294
176
165
62
122
137
41
Wind (km/h)
25
W
20
N
10
N
25
W
25
NE
20
E
20
W
15
NNE
10
ESE
15
W
15
NW
10
WNW
20
WNW
20
N
10
NNW
25
W
15
NW
20
NW
30
W
20
NNW
Wind State
on
cross
cross
on
cross-off
off
on
cross-off
off
on
cross-on
cross-on
on
cross
cross-on
on
cross-on
cross-on
on
cross
High Tide
2:40PM3.50m
3:21AM3.52m
3:47PM3.83m
4:21AM3.80m
4:40PM4.17m
5:10AM4.04m
5:27PM4.44m
5:53AM4.20m
6:10PM4.59m
6:34AM4.26m
6:49PM4.60m
7:11AM4.23m
7:27PM4.47m
Low Tide
8:51PM0.81m
9:19AM0.78m
9:55PM0.48m
10:16AM0.48m
10:49PM0.17m
11:05AM0.20m
11:36PM-0.06m
11:50AM0.01m
00:20AM-0.18m
12:33PM-0.07m
1:01AM-0.16m
1:14PM-0.03m
1:41AM-0.02m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
rain showers
rain showers
rain showers
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:01
7:03
7:03
7:05
7:07
7:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:35
9:32
9:31
9:30
9:29
9:27
9:24
 mm
3
3
1
Temp °C
22
23
18
22
25
21
29
29
26
28
29
27
29
29
22
26
26
19
19
19
Feels °C
20
19
17
20
21
16
26
26
25
25
26
25
25
24
20
23
23
17
17
15
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  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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