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Surf Forecasts:

Belle Ile - Les Donnants surfForecast / Brittany – Morbihan / France

information circle16 Day Weather and Surf, issued 6 am Wednesday 18 Mar 2026 CET
Forecast update in hr  min  s Forecast update imminent
Belle Ile - Les Donnants surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Belle Ile - Les Donnants sea temperature is
11.5° C
 (Which is normal for this time of year)

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 Thursday (Mar 19) at 4PM. The primary swell is predicted to be 1.4m and 14s period with a secondary swell of 0.9m and 6s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Belle Ile - Les Donnants in the next 16 days are 2.4m 17s and forecast to arrive on Wednesday (Mar 18) at 4PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Thursday (Mar 19) at 4AM.

Wave TypeTime (CET) & Date Wave Height & Period
Next good surf (1 star+) 4PM (Thu 19th Mar)4.5ft (1.4m) 14s
Best Surf 4AM (Tue 24th Mar)7ft (2.1m) 12s
Most Powerful 4PM (Wed 18th Mar)8ft (2.4m) 17s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Mostly dry. Very mild (max 15°C on Wed afternoon, min 8°C on Wed night). Winds decreasing (strong winds from the ENE on Wed night, moderate winds from the ENE by Thu afternoon).

Days 3-6 Weather Summary Mostly dry. Very mild (max 15°C on Sat afternoon, min 6°C on Mon night). Winds decreasing (fresh winds from the ENE on Sat morning, light winds from the W by Sun afternoon).

Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
2
4
2
2
3
1
0
0
0
0
1
1
2
2
2
0
0
2
4
2
2
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.7
W
2.4
W
2.3
W
1.7
W
1.4
W
1.1
W
0.8
WNW
0.7
WNW
0.5
WNW
0.4
WNW
0.5
W
0.9
W
0.9
W
1.2
WNW
1
WNW
0.9
WNW
0.8
WNW
1.6
NW
2
WNW
1.7
WNW
1.4
WNW
Period(s) (?)13171514141312121111171717161312128111113
Wave
Graph
(?)Metric surfscale
Energy kJ (?)10033112230710947154081951457044138481465758372267195306955661700
Wind
(km/h)
40
E
35
E
45
E
40
E
25
E
35
ENE
40
ENE
25
ENE
30
ENE
30
ENE
15
ENE
25
NE
20
NE
5
W
15
NNE
15
NW
15
NNW
25
N
10
NNE
10
W
15
NW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffoffoffoffoffoffoffcross-
off		cross-
off		cross-
off		cross-
off		cross-
off		oncross-
off		cross-
on		cross-
on		cross-
off		cross-
off		oncross-
on
High Tide
/ height (m)
4:28PM
4.15
4:41AM
4.47
5:01PM
4.34
5:16AM
4.59
5:35PM
4.43
5:51AM
4.58
6:10PM
4.41
6:29AM
4.43
6:48PM
4.27
7:10AM
4.16
7:29PM
4.03
7:55AM
3.79
8:17PM
3.70
Low Tide
/ height (m)
10:21AM
0.09
10:33PM
0.09
10:56AM
-0.11
11:09PM
-0.08
11:32AM
-0.19
11:46PM
-0.14
12:09PM
-0.14
12:26AM
-0.07
12:48PM
0.05
1:08AM
0.13
1:31PM
0.35
1:56AM
0.43
2:20PM
0.72
2:54AM
0.78
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Sunrise7:20--7:18--7:16--7:15--7:13--7:11--7:09--
Sunset-7:21--7:22--7:23--7:25--7:27--7:29--7:30-
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
clear
clear
Rain (mm)
---------------------
Temp. °C13151111141211131211151010121110117789
Feels °C (?)581496376511378757-1455
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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View detailed surf forecast for Belle Ile - Les Donnants at:
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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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