Viana do Castelo Surf Break

Lat Long: 41.69° N 8.85° W

Viana do Castelo Surf Forecast and Surf Report

Issued: 6 pm 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Viana do Castelo sea temperature is
18.5°C
0.4° 

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 30 Aug 2026:

  • Best quality surf: Monday 31 Aug, 10PM (local time) - 7ft (2.1m), 10s period, NW swell with cross-offshore winds.
  • Most powerful swell: Monday 31 Aug, 10PM (local time) - 7ft (2.1m), 10s period, NW swell with 777 kJ wave energy.
  • Next surfable swell (1★+): Sunday 30 Aug, 10PM (local time) - 4.5ft (1.4m), 9s 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 Sunday (Aug 30) at 10PM. The primary swell is predicted to be 1.4m and 9s period with a secondary swell of 0.2m and 12s. 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 2.1m 10s and forecast to arrive on Monday (Aug 31) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Friday (Sep 04) at 7PM.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Sun 30th Aug)4.5ft (1.4m) 9s
Best Surf10PM (Mon 31st Aug)7ft (2.1m) 10s
Most Powerful10PM (Mon 31st Aug)7ft (2.1m) 10s

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


The Lowdown

Alright, let's get into it. We're looking at Viana do Castelo, a river mouth setup that's fairly consistent and exposed to the west. Water temps are sitting at about 65°, which is pretty much average for this time of year, so nothing wild there.

The week kicks off with a bit of a slow start. Sunday the 30th is a write-off – cross-shore winds and only marginal surf, not worth getting wet for. Monday the 31st is where things start to get interesting. We've got a clean 6 ft swell from the NW, with a period of 10 seconds and moderate energy (622). The wind is a cross-offshore breeze, so the waves will be clean and lined up. That's the standout of the first few days, no question.

Tuesday morning (1st September) is still okay with a clean 5 ft NW swell, but the energy drops off (369). By Tuesday afternoon, the wind swings and the surf turns poor. Wednesday through Thursday sees the swell drop right down to 3 ft or less, with glassy mornings but very ordinary, weak waves. There's a gap of a few days with nothing exciting.

Then Friday the 4th brings a bit of a pulse. A 4 ft WNW swell with a long 12-second period (energy 487) and clean cross-offshore winds. That's a quality groundswell – longer period means more shape and energy, but it might wrap a bit differently at the river mouth. Saturday the 5th holds up with clean 4 ft NW swell and offshore winds in the afternoon – that's a solid, clean session.

After that, the swell fades again. Sunday the 6th is marginal, and from Monday the 7th through to the 13th, it's mostly tiny, poor surf with energy readings under 200. There's a long stretch of waist-high or smaller waves with cross-shore or onshore winds. Not worth planning around.

But check this out – Monday the 14th of September. That morning looks promising. Glassy conditions, a 5 ft W swell with a 10-second period, and moderate energy (404). That's a clean, glassy session with some decent push. It's the best call in the second week, but it's a long way out, so keep an eye on it.

Overall, the best bet is Monday morning the 31st of August. It's the most consistent, cleanest, and has the most energy. After that, Friday the 4th and Saturday the 5th are also good, but nothing else really stands out until that potential glassy session on the 14th.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 24°C on Wed morning, min 15°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 28°C on Sat morning, min 19°C on Thu night). Wind will be generally light.

Sun
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
2
3
2
3
2
1
2
1
0
1
1
0
1
2
1
3
2
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.5
WNW
9
1.4
NW
9
1.8
NW
10
1.8
NW
10
1.8
NW
9
1.5
NW
9
1.4
NW
9
1.4
NW
8
1
NW
8
0.9
NW
7
1.1
NW
7
0.6
WNW
8
0.5
WNW
8
0.5
WNW
8
1.1
NW
12
1.3
WNW
12
1.6
NW
11
1.3
NW
10
1.2
NW
9
1
NW
9
Wave Graph
Metric surfscale
Energy kJ
362
338
622
653
586
359
318
260
111
89
106
47
41
39
325
456
548
315
251
166
Wind (km/h)
15
NW
15
NNE
15
N
25
NNW
10
NNE
15
N
20
NW
10
N
5
NNW
15
NW
5
E
5
SSE
5
W
5
N
10
NNW
20
NNW
15
N
10
N
15
NW
5
E
Wind State
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
cross
glassy
glassy
cross-on
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross-off
High Tide
5:06PM3.53m
5:26AM3.40m
5:42PM3.47m
6:03AM3.36m
6:21PM3.33m
6:45AM3.25m
7:05PM3.14m
7:34AM3.08m
8:00PM2.90m
8:36AM2.90m
9:13PM2.68m
9:59AM2.78m
10:52PM2.60m
Low Tide
11:14PM0.48m
11:28AM0.56m
11:50PM0.54m
12:07PM0.65m
00:29AM0.66m
12:52PM0.81m
1:14AM0.85m
1:44PM1.01m
2:09AM1.08m
2:54PM1.21m
3:26AM1.28m
4:32PM1.31m
clear
clear
clear
clear
clear
part cloud
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>
6:58
7:00
7:01
7:01
7:03
7:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:12
8:10
8:08
8:07
8:06
8:04
8:02
 mm
Temp °C
20
17
20
21
17
20
21
19
24
25
25
26
26
21
26
25
23
28
30
26
Feels °C
19
16
17
18
15
18
19
18
22
23
25
25
26
22
23
22
22
26
28
25
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  • 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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