Viana do Castelo Surf Break

Lat Long: 41.69° N 8.85° W

Viana do Castelo Surf Forecast and Surf Report

Issued: 6 pm 19 Aug 2026 (local time)

Forecast update in  hr  min

Today's Viana do Castelo sea temperature is
18.2° C
1.1° 

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 20 Aug 2026:

  • Best quality surf: Friday 21 Aug, 10PM (local time) - 7ft (2.1m), 10s period, NNW swell with cross-offshore winds.
  • Most powerful swell: Thursday 20 Aug, 10PM (local time) - 6.5ft (2.0m), 11s period, NW swell with 915 kJ wave energy.
  • Next surfable swell (1★+): Thursday 20 Aug, 4AM (local time) - 2.5ft (0.7m), 9s period with WNW 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 20) at 4AM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.4m and 11s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Viana do Castelo in the next 16 days are 2.0m 11s and forecast to arrive on Thursday (Aug 20) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+) 4AM (Thu 20th Aug)2.5ft (0.7m) 9s
Best Surf10PM (Fri 21st Aug)7ft (2.1m) 10s
Most Powerful10PM (Thu 20th Aug)6.5ft (2.0m) 11s

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


The Lowdown

Alright folks, Rusty here with a look at the surf on the way for Viana do Castelo.

It’s a bit of a slow start, with nothing really working until Thursday morning the 20th. The water is running a bit colder than normal for this time of year, sitting at 65°, so maybe a thicker spring suit is the call.

We’ve got a bit of a mixed bag through the period. The first real chance to get wet comes Thursday morning, the 20th. Viana do Castelo (a river-mouth setup) will see a 4ft NW swell mixing with a cross-offshore breeze, making for clean enough conditions. The energy is moderate (313), but the swell period is short at 8 seconds, so the waves will be a bit weak and lack that punch. It’s a marginal call.

Friday morning, the 21st, looks like the first standout. The swell bumps up to 6ft from the NW, with a longer period of 10 seconds and a solid moderate energy reading (629). The wind is cross-offshore from the N, keeping the waves clean. The size is manageable for most, and the direction is closer to the optimum W that this spot likes.

The weekend drops right off again. Saturday morning the 22nd is a cross-onshore mess with tiny 4ft swell, and the whole weekend is a write-off. Sunday morning the 23rd shows a glimmer of hope with a 4ft W swell and light cross-offshore air, but it’s nothing to get excited about. The whole first week is patchy, with a lot of onshore wind and rain in the forecast.

Looking further ahead, the second week has some promise. Thursday morning, the 27th of August, is a real tease. The swell jumps to 7ft from the WNW, with a period of 9 seconds and a strong energy reading (693). The wind goes glassy, which is a dream. But the forecast says it’s likely too big for this break, so only the brave and experienced should even look at it.

The real standout, and the one I’d circle on the calendar, lands on Thursday morning, the 3rd of September. The swell is a solid 6ft from the NW, with a period of 10 seconds, giving it good shape and moderate energy (553). The wind is glassy, meaning the surface will be perfect. The conditions are rated as very good, and this is the best window in the whole 16-day forecast. The swell direction (NW) is solid for Viana do Castelo, which likes swell from the W. Because this spot is a river mouth, it handles the longer-period groundswell well. Crowds are often an issue here, so get out early.

The week before that, Sunday morning the 30th and Monday morning the 31st offer clean, fun-sized waves around 4-5ft from the NW, but the energy is lower and the quality isn’t at the same level as that early September session.

In short, be patient. The first week is frustrating, but the glassy conditions on the 3rd of September make it worth the wait.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 22°C on Wed afternoon, min 14°C on Thu night). Winds increasing (calm on Wed night, fresh winds from the NNW by Fri afternoon).

Days 5-7 Weather Summary

Heavy rain (total 32mm), heaviest during Mon morning. Warm (max 22°C on Sun morning, min 15°C on Sat night). Winds increasing (calm on Sat afternoon, strong winds from the SSE by Mon morning).

Wed
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
1
0
2
2
1
3
0
0
1
2
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)
0.5
WNW
10
0.7
WNW
9
1.3
NW
8
1.7
NW
7
1.9
NW
11
1.7
NW
10
1.8
NW
10
1.7
NNW
10
1.2
NNW
9
0.9
NNW
8
0.7
NNW
8
1.1
W
9
1.2
W
10
1.2
WSW
9
1.1
WSW
8
2.5
SSW
8
2.1
SW
8
1.3
WSW
7
1
WSW
6
1.5
SW
6
Wave Graph
Metric surfscale
Energy kJ
52
82
239
271
777
569
625
522
216
123
58
205
257
208
161
897
528
150
85
170
Wind (km/h)
10
SW
5
N
15
NNW
30
NNW
20
N
20
N
30
NNW
10
NE
15
S
10
WSW
10
ESE
5
ESE
20
SSE
20
SE
40
SSE
30
SSW
20
SW
10
SSW
20
SSW
10
WNW
Wind State
on
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-on
on
cross-off
cross-off
cross
cross
cross-on
cross-on
on
cross-on
cross-on
cross-on
High Tide
8:16PM2.69m
8:49AM2.63m
9:13PM2.48m
9:55AM2.50m
10:36PM2.35m
11:23AM2.48m
00:13AM2.37m
12:43PM2.59m
1:23AM2.50m
1:39PM2.77m
2:09AM2.67m
2:21PM2.96m
2:45AM2.85m
Low Tide
2:23AM1.32m
2:57PM1.47m
3:22AM1.50m
4:20PM1.58m
4:49AM1.60m
6:00PM1.55m
6:18AM1.55m
7:10PM1.41m
7:18AM1.41m
7:57PM1.22m
8:02AM1.23m
8:34PM1.03m
clear
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
clear
part cloud
cloud
rain showers
rain showers
mod rain
rain showers
rain showers
rain showers
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:48
6:48
6:50
6:50
6:52
6:52
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:30
8:28
8:27
8:24
8:23
8:22
8:21
 mm
1
4
8
7
10
2
1
4
Temp °C
22
19
21
21
17
22
21
18
21
21
17
22
22
20
20
20
19
20
21
19
Feels °C
23
21
18
16
14
17
16
15
19
20
18
21
20
19
16
16
19
19
20
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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