Port Blanc Surf Break

Lat Long: 47.51° N 3.15° W

Port Blanc Surf Forecast and Surf Report

Issued: 7 am 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Port Blanc sea temperature is
19.7°C
1.5° 

Port Blanc surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Port Blanc surf forecast from 4 Sep 2026:

  • Best quality surf: Saturday 5 Sep, 2AM (local time) - 3.5ft (1.0m), 9s period, W swell with cross-offshore winds.
  • Most powerful swell: Monday 7 Sep, 5PM (local time) - 5ft (1.5m), 13s period, W swell with 752 kJ wave energy.
  • Next surfable swell (1★+): Saturday 5 Sep, 2AM (local time) - 3.5ft (1.0m), 9s period with W swell.

Best Forecast Surf Conditions for Port Blanc this week:

The surf forecast for Port Blanc over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 05) at 2AM. The primary swell is predicted to be 1.0m and 9s period with a secondary swell of 0.3m and 15s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Port Blanc in the next 16 days are 1.5m 13s and forecast to arrive on Monday (Sep 07) at 5PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Sunday (Sep 06) at 5AM.

Wave TypeTime (CEST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Sat 5th Sep)3.5ft (1.0m) 9s
Best Surf 2AM (Sat 5th Sep)3.5ft (1.0m) 9s
Most Powerful 5PM (Mon 7th Sep)5ft (1.5m) 13s

Table - best surf conditions forecast for Port Blanc over the next 16 days.


The Lowdown

Alright, Rusty here. Let's have a look at what's cookin' for Port Blanc over the next couple of weeks.

Straight up, it's a bit of a mixed bag. We've got a decent pulse of swell rolling in, but the wind is gonna be the main character in this story for most of the run. The water's sitting at 68°, which is a touch warmer than we'd normally expect for this time of year.

The first real chance to get wet is Saturday morning, the 5th of September. That's our standout. We're looking at a nice 4ft groundswell from the west, with a solid 12-second period between sets. That's got some proper push. The real kicker here is the light easterly offshore breeze, which is gonna be cleaning it right up. It's an exposed spot, and the swell direction from the west is bang on for what Port Blanc likes. The wave energy is moderate (428). This is the window to be out there. It's advanced territory and crowds are only a sometimes thing, so you might have a few others out, but it should be worth it.

It won't last though. By Saturday afternoon the wind swings to a messy cross-onshore, and the quality drops off a cliff.

Sunday morning the 6th is a write-off too, with onshore winds. There's a window early on Monday the 7th, with a 3ft west-southwest swell and a very long 14-second period. That's a proper groundswell with heaps of energy (539). The catch? The wind is on it, so it's gonna be lumpy. Not ideal.

From there it's a long, frustrating stretch. From Monday afternoon the 7th all the way through to Sunday the 13th of September, it's a grim run. Onshore winds, strengthening breeze, and even a bit of rain on the 10th. The swell sticks around but the wind is just relentless, making it choppy and poor. This is the part where you might want to check the kite spot if you've got the gear, 'cause it's not pretty for a surfboard.

Things get quiet after that. A real lull sets in. Around Monday morning the 14th of September, we've got a tiny 2ft leftover groundswell, but it's glassy with an easterly offshore. The wave energy is weak (81). It's surfable, but only just. That's about it for the rest of the run. The swell fades to nothing, and while a couple of afternoons, like Thursday the 17th and Friday the 18th, have decent offshore winds, there's simply no swell to work with.

So, to boil it down: your one and only chance to score is first thing Saturday morning the 5th of September. After that, the wind blows it out for a week, and then the swell disappears. It's a tough outlook.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 23°C on Sat night, min 15°C on Sat morning). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 6mm), mostly falling on Wed night. Very mild (max 19°C on Mon morning, min 15°C on Mon night). Winds increasing (light winds from the W on Mon morning, strong winds from the WSW by Wed night).

Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
AM
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
2
2
1
0
1
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)
0.8
W
9
1
W
9
1
W
9
1.1
W
12
1
W
13
0.8
W
11
0.6
W
10
0.5
W
10
0.5
W
9
1
WSW
14
1.5
W
13
1.5
W
12
1.3
W
11
1.4
W
10
1.2
W
9
0.9
W
8
1.2
WNW
9
0.9
W
8
1.2
W
5
1.5
W
6
1.2
W
9
Wave Graph
Metric surfscale
Energy kJ
93
151
164
374
326
157
69
45
39
437
752
617
375
361
251
111
227
102
75
182
220
Wind (km/h)
15
W
25
W
10
NNE
10
E
10
SW
25
ENE
25
ESE
10
SW
20
WNW
15
W
20
WSW
15
WNW
25
W
35
W
20
NW
15
WNW
25
W
30
SW
35
WSW
25
W
20
WNW
Wind State
on
on
cross-off
off
cross-on
off
off
cross-on
on
on
on
cross-on
on
on
cross-on
cross-on
on
cross-on
cross-on
on
on
High Tide
10:05AM3.60m
10:44PM3.39m
11:26AM3.36m
00:32AM3.20m
1:23PM3.37m
2:22AM3.34m
2:52PM3.68m
3:32AM3.66m
3:51PM4.06m
4:22AM3.99m
4:38PM4.41m
5:04AM4.26m
5:19PM4.65m
Low Tide
4:45PM1.09m
5:20AM1.27m
6:09PM1.25m
6:48AM1.36m
7:40PM1.17m
8:12AM1.18m
8:56PM0.87m
9:19AM0.85m
9:55PM0.50m
10:11AM0.50m
10:42PM0.18m
10:57AM0.20m
11:24PM-0.05m
clear
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
light rain
rain showers
clear
clear
clear
part cloud
light rain
mod rain
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:33
7:35
7:37
7:37
7:39
7:41
7:41
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:47
8:45
8:44
8:42
8:39
8:37
8:36
 mm
1
1
4
7
Temp °C
19
20
21
15
21
23
20
21
20
19
19
18
17
17
19
16
17
17
18
20
21
Feels °C
18
19
19
12
18
20
14
18
19
20
18
16
13
13
12
13
14
14
13
17
17
  • 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 Port Blanc Surf forecast

The above surf forecast table for Port Blanc provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Port Blanc can be found by selecting the local surf guide option on the grey menu. Our Port Blanc 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 (Port Blanc) 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 Port Blanc 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.

Port Blanc is 31 km (19 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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