Le Sillon surf break

Le Sillon surfForecast / Brittany – Ile et Vilaine / France

information circle12 Day Weather and Surf, issued 12 pm Wednesday 10 Dec 2025 CET
Forecast update in hr  min  s Forecast update imminent
Le Sillon surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Le Sillon sea temperature is
11.7° C
(Which is normal for this time of year)


Best Forecast Surf Conditions for Le Sillon this week:

The surf forecast for Le Sillon over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Dec 10) at 10PM. The primary swell is predicted to be 1.1m and 12s period with a secondary swell of 0.2m and 16s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Le Sillon in the next 12 days are 1.8m 19s and forecast to arrive on Friday (Dec 12) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Sunday (Dec 14) at 10PM.

Wave TypeTime (CET) & Date Wave Height & Period
Next good surf (1 star+)10PM (Wed 10th Dec)3.5ft (1.1m) 12s
Best Surf10PM (Fri 12th Dec)6ft (1.8m) 18s
Most Powerful 4PM (Fri 12th Dec)6ft (1.8m) 19s

Table - best surf conditions forecast for Le Sillon over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 7mm), mostly falling on Fri night. Very mild (max 13°C on Wed afternoon, min 8°C on Thu morning). Winds decreasing (fresh winds from the SSW on Thu night, calm by Fri night).

Days 3-6 Weather Summary Moderate rain (total 12mm), heaviest on Mon afternoon. Very mild (max 13°C on Mon night, min 8°C on Sat morning). Winds increasing (light winds from the SSW on Sat morning, strong winds from the SSW by Mon morning).

Wednesday
10
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
0
2
2
1
2
0
3
3
4
3
2
1
1
1
0
0
0
2
2
1
Swell
Height Map
Wave Height (m) & direction (?)
1.4
WNW
1.2
WNW
1
WNW
1.2
WNW
0.9
WNW
1.2
WNW
1.4
WNW
1.8
WNW
1.7
WNW
1.5
WNW
1.3
WNW
1.2
WNW
1.5
WNW
1.4
WNW
1.4
WNW
1.3
WNW
1.3
WNW
1
WNW
1.2
WNW
1.6
WNW
1.7
WNW
Period(s) (?)131312141314161918171614131316141413131315
Wave
Graph
(?)Metric surfscale
Energy kJ (?)6424842985343035888832228179412527835497036429766425973725158361256
Wind
(km/h)
20
SW
15
W
15
SSW
20
S
20
SSE
20
SSE
20
WSW
10
N
10
NE
5
SSW
10
SSW
25
S
30
S
30
SSW
35
S
45
SSW
40
S
30
SSW
20
SSW
15
SW
15
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
on
cross-
off
cross-
off
cross-
off
cross-
off
cross-
on
cross-
on
crosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
crosscross-
on
High Tide
/ height (m)
10:47AM
10.87
11:17PM
10.12
11:40AM
10.19
12:16AM
9.50
12:44PM
9.60
1:26AM
9.09
1:56PM
9.24
2:39AM
8.97
3:07PM
9.17
3:43AM
9.12
4:07PM
9.32
4:36AM
9.42
4:58PM
9.59
Low Tide
/ height (m)
5:47PM
2.80
6:06AM
3.44
6:36PM
3.41
6:57AM
3.99
7:30PM
3.93
7:53AM
4.40
8:29PM
4.28
8:57AM
4.61
9:35PM
4.40
10:07AM
4.56
10:41PM
4.28
11:11AM
4.30
11:37PM
4.01
Wednesday
10
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Sunrise8:48--8:48--8:49--8:51--8:52--8:52--8:53--
Sunset-5:10--5:10--5:10--5:10--5:12--5:12--5:12-
cloud
clear
clear
part cloud
cloud
cloud
part cloud
light rain
rain showers
clear
clear
part cloud
part cloud
part cloud
cloud
light rain
light rain
light rain
part cloud
cloud
clear
Rain (mm)
-------16------354---
Temp. °C12131110111111989109101212111213121210
Feels °C (?)8108576776674465277886
  • 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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Information about the Le Sillon Surf forecast

The above surf forecast table for Le Sillon provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Le Sillon can be found by selecting the local surf guide option on the grey menu. Our Le Sillon 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 (Le Sillon) 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 Le Sillon 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.

Are you planning a holiday in Ile et Vilaine - Brittany? If you are looking for accommodation near Le Sillon, camping, hotels and holiday cottages in Ile et Vilaine - Brittany, consider staying in Saint Malo which is 2 km (1 miles) away. Other places in and around Ile et Vilaine - Brittany where you can find information about places to rent, and car hire include Cancale which is 9 km (6 miles) away, Granville, Saint-Brieuc and Saint Helier.

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