Viana do Castelo Surf Break

Lat Long: 41.69° N 8.85° W

Viana do Castelo Surf Forecast and Surf Report

Issued: 12 pm 08 Sep 2026 (local time)

Forecast update in  hr  min

Today's Viana do Castelo sea temperature is
18.9°C
0.0° 

Viana do Castelo surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Viana do Castelo surf forecast from 8 Sep 2026:

  • Best quality surf: Sunday 13 Sep, 1AM (local time) - 4.5ft (1.4m), 13s period, NW swell with cross-offshore winds.
  • Most powerful swell: Sunday 13 Sep, 4AM (local time) - 5ft (1.6m), 13s period, NW swell with 790 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 8 Sep, 10PM (local time) - 5ft (1.5m), 8s period with NW swell.

Best Forecast Surf Conditions for Viana do Castelo this week:

The surf forecast for Viana do Castelo over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 08) at 10PM. The primary swell is predicted to be 1.5m and 8s period with a secondary swell of 0.2m and 9s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Viana do Castelo in the next 16 days are 1.6m 13s and forecast to arrive on Sunday (Sep 13) at 4AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Friday (Sep 11) at 7PM.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Tue 8th Sep)5ft (1.5m) 8s
Best Surf 1AM (Sun 13th Sep)4.5ft (1.4m) 13s
Most Powerful 4AM (Sun 13th Sep)5ft (1.6m) 13s

Table - best surf conditions forecast for Viana do Castelo over the next 16 days.


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s shaping up for our little corner of the coast.

We’ve got a slow start, but the waiting game will pay off. The first real surf worth paddling out for hits on Tuesday morning, September 8th. It’s not a giant, but it’s clean. The water temp is sitting right on 66°, which is bang on average for this time of year, so no need to dig out the thick rubber just yet.

Tuesday morning, September 8th, at Viana do Castelo (river), we’ve got a glassy ocean with a 4ft swell pushing in from the WNW. The period is a solid 10 seconds, giving the waves a bit of push. The combined energy is moderate (305), and with the wind dead calm, the surface is going to be like a mirror. It’s a beginner-friendly river break, but it’s often crowded, so you’ll be sharing the peak. This is a solid, clean start.

The rest of the first week is a bit of a mixed bag. Wednesday and Thursday mornings, September 9th and 10th, offer similar 4ft swell from the NNW, but those winds get into it later. Thursday morning, the 10th, is the pick of the workweek if you can sneak out – clean with a light breeze and a 4ft NNW swell (363 energy). Friday, the 11th, drops right off.

Saturday morning, September 12th, is worth a mention for the early glass-off. The swell is tiny at 3ft from the NNW, and the energy is weak (156), but if you’re on a log, the glassy conditions will make it fun. Saturday afternoon gets a spike in energy (244) from a very long period 16 second NW swell, but it’s only 1ft, so it’s more of a shimmer than a wave.

The standout window is Sunday, September 13th. Sunday morning is the best on offer. We’ve got a solid 5ft groundswell from the NW, with a 12-second period, pushing a lot of energy into the river mouth (646). The wind is a light offshore from the East, which is going to hold those lines up clean. This is a damn good looking session. The afternoon gets a bit wonky with cross-shore winds, so get it while it’s good.

Monday morning, the 14th, cleans up again with glassy conditions and a 3ft NW swell (270). It’s a nice follow-up session.

Looking further ahead, the surf dips again for a few days, but the very end of the forecast, on Wednesday afternoon, September 23rd, looks like a long-range bomb. We’re seeing a significant 6ft WNW swell with a very long 16-second period, and the energy is a massive 1474. The wind is glassy on the afternoon. This is a big, powerful groundswell. At a river break, that long period can make it a bit walled-up, so this is one for the experienced crew. It’s promising, but it’s a long way out, so keep an eye on it.

There’s a couple of days with no real recommendations in the middle of the second week, but with the way the forecast is building, it doesn’t look like a blank run. Stick with it.

Rusty.

Short Range Forecast

Moderate rain (total 12mm), heaviest on Tue afternoon. Warm (max 23°C on Wed afternoon, min 15°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 31°C on Sun morning, min 20°C on Fri morning). Wind will be generally light.

Tuesday
8
Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
1
1
0
2
2
1
0
1
0
1
1
2
3
3
2
3
2
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
WNW
10
0.8
W
9
1.7
NW
8
1.3
NNW
8
1.4
NNW
8
1.4
NNW
7
1.3
NNW
10
1.2
NNW
10
0.7
NNW
9
0.6
NW
9
0.1
SW
15
1.4
NW
6
0.9
NNW
7
0.4
NW
16
1.4
NW
13
1.5
NW
12
1.5
NW
12
1.4
NW
12
1
NW
11
0.8
NW
10
0.6
NW
10
Wave Graph
Metric surfscale
Energy kJ
305
103
389
237
254
202
333
241
73
62
8
172
78
89
690
634
614
519
224
156
76
Wind (km/h)
0
SW
10
S
20
N
15
NNE
25
NNW
15
N
10
N
25
NNW
20
N
15
N
20
NNW
10
NNE
5
NE
15
NW
10
E
5
E
10
NW
5
ENE
5
SE
5
WNW
5
NNE
Wind State
glassy
cross-on
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
glassy
cross-off
cross-off
cross-off
cross
off
glassy
cross-on
cross-off
High Tide
1:56PM3.21m
2:29AM3.14m
2:44PM3.40m
3:11AM3.31m
3:25PM3.54m
3:49AM3.42m
4:02PM3.59m
4:25AM3.46m
4:37PM3.56m
4:58AM3.43m
5:10PM3.47m
5:30AM3.34m
5:42PM3.31m
Low Tide
8:14PM0.75m
8:28AM0.80m
8:57PM0.56m
9:10AM0.64m
9:36PM0.45m
9:48AM0.55m
10:11PM0.41m
10:23AM0.53m
10:44PM0.45m
10:56AM0.58m
11:16PM0.55m
11:29AM0.69m
11:46PM0.70m
rain showers
heavy rain
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:07
7:07
7:09
7:09
7:11
7:11
7:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:57
7:55
7:53
7:52
7:51
7:49
7:46
 mm
1
11
Temp °C
19
19
19
21
23
18
21
21
18
24
27
24
30
30
27
31
31
28
30
29
25
Feels °C
20
21
20
18
18
15
19
17
15
22
24
22
29
28
25
29
29
26
28
27
24
  • 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 Viana do Castelo Surf forecast

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

Viana do Castelo is 3 km (2 miles) from Viana do Castelo. If you plan a holiday in Douro and Minho, look for hotels and other accommodation in Viana do Castelo. Viana do Castelo has rooms for a wide range of budgets as well as car hire and transport links.

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