Viana do Castelo Surf Break

Lat Long: 41.69° N 8.85° W

Viana do Castelo Surf Forecast and Surf Report

Issued: 12 am 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Viana do Castelo sea temperature is
17.9°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 30 Aug 2026:

  • Best quality surf: Monday 31 Aug, 7AM (local time) - 5ft (1.6m), 10s period, NW swell with offshore winds.
  • Most powerful swell: Saturday 5 Sep, 7AM (local time) - 5ft (1.6m), 14s period, NW swell with 990 kJ wave energy.
  • Next surfable swell (1★+): Sunday 30 Aug, 10AM (local time) - 5ft (1.6m), 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 10AM. The primary swell is predicted to be 1.6m and 9s period. 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 14s and forecast to arrive on Saturday (Sep 05) at 7AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Tuesday (Sep 01) at 10AM.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+)10AM (Sun 30th Aug)5ft (1.6m) 9s
Best Surf 7AM (Mon 31st Aug)5ft (1.6m) 10s
Most Powerful 7AM (Sat 5th Sep)5ft (1.6m) 14s

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


The Lowdown

Alright, grab your board and listen up, this is Rusty.

Alright, we’re looking at a solid run of surf here at the river mouth in Viana do Castelo. The first real action kicks off on Sunday, August 30th, and it’s a promising start. We’ve got a clean, chest-high swell running at 5 ft from the NW with a decent 9-second period. The wind is a light northwesterly and it’s cross-offshore, so those waves will be holding their shape nicely. This is a great window for a session.

Monday, August 31st, is where it gets a bit more interesting. The swell builds to 6 ft from the NW, but the period is still 10 seconds. The morning is looking much better than the afternoon, with a light northerly and clean conditions. The afternoon kicks up a stiff 16 mph wind, so aim for the early bird paddle-out.

The best of the bunch, the real standout, looks like Saturday, September 5th. Expect a punchy 5 ft NW groundswell with a very long 13-second period. The morning wind is a light NE breeze, cross-offshore, so this river mouth setup should be firing with long, lined-up walls. It’s a big day for surfers who know what they’re doing; the crowd could be noticeable here.

After that, we have a bit of a lull, but then Tuesday, September 8th, cranks back up. The morning is glassy with the wind swinging NW and going dead calm. You’ll find a clean 5 ft swell. Get on it early before the sea breeze kicks in.

We also have a long-range flicker on Sunday morning, September 13th. It’s a glassy morning with a 2 ft swell, but the period is a very long 14 seconds. At this time of year, a tiny swell with that much period can create some real fun, fat waves at a place like this.

So, to wrap it up: your best early call is Saturday morning, September 5th. That’s the one to circle on the calendar. The water temperature is about average for this time of year, so a spring suit will be fine.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 23°C on Tue afternoon, min 15°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 28°C on Fri afternoon, min 16°C on Tue night). Winds increasing (calm on Thu night, fresh winds from the NNW by Fri afternoon).

Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
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
1
2
3
2
2
2
1
2
1
0
1
0
0
1
2
0
0
3
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.6
NW
9
1.5
WNW
9
1.4
NW
9
1.8
NW
10
1.8
NW
10
1.8
NW
9
1.3
NW
9
1.6
NW
9
1.6
NW
8
1
NW
8
0.9
NW
7
1.2
NW
7
1
NW
7
0.9
NW
7
1.1
NW
6
1.3
NW
11
1.3
NW
11
1.3
NW
10
1.6
NW
13
1.4
NW
12
1.2
NW
11
Wave Graph
Metric surfscale
Energy kJ
388
362
338
622
653
573
266
412
322
108
89
131
91
79
97
361
375
355
892
565
344
Wind (km/h)
10
NW
15
NW
15
NNE
10
N
25
NNW
15
N
10
N
25
NNW
15
N
10
N
15
NW
5
ENE
5
SSW
5
NW
0
E
15
N
30
NNW
25
N
15
NNE
20
NNW
5
ENE
Wind State
cross-off
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
glassy
cross-on
cross
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
off
High Tide
4:52AM3.38m
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
10:52AM0.54m
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
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
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
20
17
21
21
17
20
23
19
25
26
25
24
24
20
26
28
22
28
30
28
Feels °C
19
18
16
18
18
15
17
20
17
23
24
24
24
24
21
22
23
18
26
27
27
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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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