Viana do Castelo Surf Break

Lat Long: 41.69° N 8.85° W

Viana do Castelo Surf Forecast and Surf Report

Issued: 6 pm 11 Aug 2026 (local time)

Forecast update in  hr  min

Today's Viana do Castelo sea temperature is
20.5° C
1.5° 

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 11 Aug 2026:

  • Best quality surf: Saturday 15 Aug, 1PM (local time) - 7.5ft (2.3m), 8s period, NW swell with cross-offshore winds.
  • Most powerful swell: Saturday 15 Aug, 4PM (local time) - 10ft (3.0m), 8s period, NW swell with 936 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 12 Aug, 1AM (local time) - 2.5ft (0.7m), 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 Wednesday (Aug 12) at 1AM. The primary swell is predicted to be 0.7m and 10s period with a secondary swell of 0.8m and 5s. 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 3.0m 8s and forecast to arrive on Saturday (Aug 15) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Friday (Aug 14) at 1AM.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Wed 12th Aug)2.5ft (0.7m) 10s
Best Surf 1PM (Sat 15th Aug)7.5ft (2.3m) 8s
Most Powerful 4PM (Sat 15th Aug)10ft (3.0m) 8s

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


The Lowdown

Alright, folks, let's get into it. The next couple of weeks here at Viana do Castelo are a bit of a mixed bag. We're looking at a river mouth set-up that's fairly consistent, but don't expect perfection every day. The water is sitting at a warm 69°, which is a touch warmer than normal for this time of year, so the boardies are definitely the go.

It starts off pretty quiet. Tuesday the 11th has some tiny 2ft swell from the NW with a period of 8 seconds, giving us a weak energy of 119. The morning is glassy, but the swell is small and the conditions are just ordinary. The afternoon gets messy with a cross-shore wind.

Wednesday the 12th morning is where it starts to look a bit better. A clean 3ft swell from the west with a 10-second period, and glassy conditions. The combined energy is moderate at 220. That's a decent window for a beginner-friendly session. The afternoon is a bit more marginal.

The real standout for the whole period, though, is Saturday morning, the 15th. We're looking at a 7ft swell from the NNW, but it's short period at 8 seconds. The wind is a clean cross-off from the north at 16 mph, and the wave energy is strong at 560. Now, the swell is pushing into the range that's better for experienced surfers, but it's clean and there's plenty of push. The guidance says this spot is exposed to the west, and we're getting swell from the NNW, so it's not the absolute optimum direction, but the size and clean conditions make it the best on offer.

Sunday the 16th morning drops back to 5ft from the NNW with clean cross-off winds, but it's still on the short-period side. The following Monday morning, the 17th, is a nice little glassy morning with 4ft swell from the NNW, good for a beginner session.

After that, the surf gets a bit fickle. There's a big drop on Tuesday the 18th morning with a tiny 0.3ft swell, then a jump to a messy 7ft that afternoon. Wednesday the 19th morning has a glassy 6ft swell from the NNW, which is a good call.

Thursday the 20th is a different story. We get a long-period groundswell, 5ft from the NW with a 12-second period, and the energy goes through the roof at 1044. The wind is light cross-on, so it's a bit choppy. Then that afternoon, the swell jumps to 8ft from the NW with an 11-second period, and the energy is massive at 1784. That's a lot of water moving, but it's likely going to be too big for this river break and best left for the experts.

The following week, from the 21st onwards, we see a lot of bigger, cleaner swells, but they are consistently in the 7ft to 8ft range with strong cross-off winds. While the conditions look clean, the size is just too much for this spot to handle well. It's going to be a challenge for anyone but the most experienced. The energy readings are often in the 900s, showing just how much power is in the water. There are a few mornings like the 24th and 26th with 6ft to 6ft swells and lighter winds that could be worth a look, but Saturday the 15th remains the true standout.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 24°C on Thu afternoon, min 18°C on Tue night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 27°C on Sat afternoon, min 18°C on Fri night). Winds decreasing (strong winds from the NNW on Sat afternoon, light winds from the N by Sun morning).

Tue
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
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
2
1
2
1
0
1
1
0
1
1
0
!
2
0
!
2
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)
0.9
NW
10
0.7
W
10
1
W
10
1
W
10
1
W
10
1.1
W
10
1
WNW
10
1
WNW
9
0.9
WNW
9
0.9
WNW
9
1.7
NNW
7
1.9
NW
8
3
NW
8
2.2
NNW
8
1.7
NNW
7
1.9
NNW
7
2.2
NNW
8
1.6
NNW
7
1.9
NNW
7
2
NNW
7
Wave Graph
Metric surfscale
Energy kJ
142
94
179
179
183
250
209
181
116
113
261
424
936
566
329
387
581
235
326
405
Wind (km/h)
20
NW
5
NNE
5
W
15
NW
5
NE
5
WNW
15
NW
10
N
5
NNW
20
NW
20
N
20
N
40
NNW
20
N
10
N
25
NNW
20
NNE
10
N
35
NNW
30
N
Wind State
cross
glassy
glassy
cross
glassy
cross-on
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
3:26AM3.28m
3:43PM3.58m
4:10AM3.39m
4:25PM3.65m
4:51AM3.42m
5:05PM3.63m
5:30AM3.39m
5:43PM3.54m
6:07AM3.29m
6:19PM3.37m
6:43AM3.15m
6:55PM3.16m
Low Tide
9:12PM0.57m
9:25AM0.63m
9:56PM0.44m
10:08AM0.55m
10:37PM0.39m
10:48AM0.53m
11:16PM0.42m
11:26AM0.60m
11:52PM0.52m
12:03PM0.72m
00:28AM0.68m
12:40PM0.89m
1:03AM0.88m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:39
6:41
6:41
6:43
6:43
6:45
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:40
8:39
8:37
8:37
8:36
8:34
8:32
 mm
Temp °C
22
18
23
23
20
23
24
20
23
23
21
25
27
21
27
26
23
26
26
23
Feels °C
21
18
24
23
21
23
24
20
23
22
19
21
22
17
26
23
21
24
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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