Viana do Castelo Surf Break

Lat Long: 41.69° N 8.85° W

Viana do Castelo Surf Forecast and Surf Report

Issued: 6 am 06 Aug 2026 (local time)

Forecast update in  hr  min

Today's Viana do Castelo sea temperature is
18.1° C
0.7° 

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 6 Aug 2026:

  • Best quality surf: Tuesday 11 Aug, 10PM (local time) - 2.5ft (0.8m), 9s period, NW swell with cross-offshore winds.
  • Most powerful swell: Wednesday 12 Aug, 7PM (local time) - 3.5ft (1.1m), 9s period, W swell with 201 kJ wave energy.
  • Next surfable swell (1★+): Thursday 6 Aug, 10PM (local time) - 1.5ft (0.4m), 10s period with W 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 Thursday (Aug 06) at 10PM. The primary swell is predicted to be 0.5m and 8s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.7m and 5s is also forecast. 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 1.1m 9s and forecast to arrive on Wednesday (Aug 12) at 7PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Thursday (Aug 06) at 7PM.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Thu 6th Aug)1.5ft (0.4m) 10s
Best Surf10PM (Tue 11th Aug)2.5ft (0.8m) 9s
Most Powerful 7PM (Wed 12th Aug)3.5ft (1.1m) 9s

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


The Lowdown

Alright, let’s switch to feet and Fahrenheit for the crew who think in those numbers.

The first week is a flat spell, no way around it. We’re looking at a long stretch of small, weak waves and cross-shore winds. It’s not until the second week that we get a pulse, and even then, the best windows are tight. The standout sessions are the mornings of Tuesday, August 18th, and Wednesday, August 19th.

Thursday the 6th and Friday the 7th are a no-go. Swell is around 2 to 3 ft, with a combined energy of 143 and 90, and the wind is cross or light. Saturday the 8th through Monday the 10th are the same story – tiny, weak, and messy. You’ll get some glassy mornings on the 7th, 8th, 9th, and 11th, but the swell is mostly under 2 ft, with energy in the double digits. It’s a real dry run.

Tuesday the 12th shows a lift to 4 ft from the W, with a combined energy of 242, but the wind is cross-shore, keeping it marginal. That continues through Wednesday the 13th and into the weekend, with swell bouncing between 3 ft and 5 ft, but the wind never cleans up. The north-westerlies are blowing 12-19 mph on the afternoons, making it choppy.

Now, the good stuff. The morning of Tuesday the 18th is the standout. We’ve got a solid 6 ft swell from the NW, with a combined energy of 480 – that’s moderate energy, enough to get excited. The wind is light at 3 mph from the NNE, which is cross-offshore, and the conditions are clean. This is a session for intermediate to advanced surfers. At 6 ft, beginners might be in over their heads, and the period is only 8 seconds, so it’s a short-period windswell. Still, it’s the biggest we’ve seen.

The next morning, Wednesday the 19th, is another winner. The swell drops to 4 ft from the NNW, with a combined energy of 237. The wind is glassy, 3 mph from the NNW, making the surface perfect. This one is more manageable for all levels. The period is 9 seconds, so the waves will have a bit more shape.

We’re talking about Viana do Castelo, a river mouth exposed to the W. It’s fairly consistent, but it’s a beginner-friendly spot that can get crowded often. The water temperature is about average for the time of year. The ideal swell direction is from the W. The Tuesday swell is from the NW, which is a bit off, but the Wednesday swell is from the NNW, which is closer. The best wave quality is on those two mornings, with Tuesday offering the biggest size and Wednesday offering the cleanest conditions.

The afternoons in the second week are all blown out by stronger north-westerly winds, so mornings are the move. By the end of the period, Friday the 21st, the swell is back down to 3 ft, and the energy is weak. It’s a short window, but those two mornings are the real deal.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 23°C on Fri afternoon, min 18°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 22°C on Sun morning, min 16°C on Tue night). Wind will be generally light.

Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
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
1
0
0
0
0
0
1
1
0
1
1
0
1
0
0
2
2
0
2
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
NNW
8
0.8
NNW
8
0.9
NW
6
0.7
NNW
8
0.5
NW
8
0.4
NW
7
0.3
W
9
0.5
W
7
0.4
NW
11
0.5
NW
10
0.6
NNW
10
0.6
NW
9
0.7
NW
8
0.8
NW
7
1.1
NW
6
0.7
NW
6
0.8
NW
10
0.9
NW
9
0.9
W
9
1
W
9
1.1
W
9
Wave Graph
Metric surfscale
Energy kJ
88
86
52
56
29
14
14
25
33
48
61
64
61
71
90
30
117
125
130
175
198
Wind (km/h)
5
NW
20
NW
5
NNE
5
SW
15
NW
10
N
5
WNW
10
WNW
5
NE
0
WNW
15
NW
10
N
5
NW
15
NW
5
E
5
SW
15
NW
5
NNE
5
NW
20
NW
10
NNE
Wind State
cross
cross
glassy
on
cross
cross-off
cross-on
cross
off
glassy
cross
cross-off
glassy
cross
glassy
on
cross
glassy
glassy
cross
cross-off
High Tide
9:28PM2.82m
10:14AM2.85m
10:51PM2.72m
11:39AM2.88m
00:21AM2.76m
12:59PM3.03m
1:36AM2.92m
2:03PM3.24m
2:36AM3.11m
2:56PM3.43m
3:26AM3.28m
3:43PM3.58m
Low Tide
3:12PM1.17m
3:46AM1.14m
4:37PM1.24m
5:10AM1.19m
6:07PM1.17m
6:33AM1.11m
7:22PM0.98m
7:41AM0.95m
8:22PM0.76m
8:37AM0.77m
9:12PM0.57m
9:25AM0.63m
9:56PM0.44m
clear
clear
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>
6:33
6:35
6:35
6:37
6:37
6:39
6:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:47
8:45
8:45
8:44
8:42
8:40
8:39
 mm
Temp °C
22
22
19
22
23
19
23
23
20
22
22
19
22
22
18
22
22
18
22
22
18
Feels °C
20
20
18
22
23
19
23
23
22
22
21
19
21
21
18
23
22
18
22
21
17
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  • 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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