Viana do Castelo Surf Break

Lat Long: 41.69° N 8.85° W

Viana do Castelo Surf Forecast and Surf Report

Issued: 6 pm 24 Aug 2026 (local time)

Forecast update in  hr  min

Today's Viana do Castelo sea temperature is
16.6°C
2.6° 

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 25 Aug 2026:

  • Best quality surf: Friday 28 Aug, 1AM (local time) - 7ft (2.2m), 12s period, W swell with cross-shore winds.
  • Most powerful swell: Friday 28 Aug, 4AM (local time) - 8ft (2.5m), 11s period, WNW swell with 1,478 kJ wave energy.
  • Next surfable swell (1★+): Friday 28 Aug, 1AM (local time) - 7ft (2.2m), 12s 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 Friday (Aug 28) at 1AM. The primary swell is predicted to be 2.2m and 12s period. The wind is predicted to be cross-shore as the swell arrives.

The most powerful waves expected at Viana do Castelo in the next 16 days are 2.5m 11s and forecast to arrive on Friday (Aug 28) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Sunday (Aug 30) at 7PM.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Fri 28th Aug)7ft (2.2m) 12s
Best Surf 1AM (Fri 28th Aug)7ft (2.2m) 12s
Most Powerful 4AM (Fri 28th Aug)8ft (2.5m) 11s

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


The Lowdown

Alright, let’s get into it. This is Rusty.

First up, the outlook for the next couple of weeks here is a bit of a mixed bag. There’s a long gap of poor conditions right at the start, so don’t get your hopes up for the next few days. The first real surf on offer doesn’t show until Friday the 28th of August, but that comes with some serious size and caveats. After that, things get cleaner and more promising, with a true standout for the experts showing up in the second week.

We’re looking at a river break here, Viana do Castelo, and it’s exposed to the west swell. The water temp is running unusually cold for this time of year, about 62°, which is about 5° below the norm. That’s a notable chill, so a decent wetsuit is non-negotiable.

The first few days are a washout. Monday the 24th has rain showers, an onshore SW wind at 16 mph, and a messy 7ft SSW swell with a short 8-second period. Combined wave energy is moderate at 654, but the wind and conditions are just poor. Tuesday and Wednesday don’t get any better with onshore and cross-onshore winds, small swell, and more rain. Honestly, not worth paddling out.

Thursday the 27th stays poor with cross-onshore winds and a choppy 5ft to 4ft swell. Nothing to write home about.

Now, here’s where it gets interesting. Friday the 28th of August morning is a real standout. The wind drops to dead glassy, calm conditions, with a clean 7ft WNW groundswell rolling in with a 10-second period. The combined energy is strong at 952. This is the best looking session in the entire forecast. However, the swell is over 5ft and pushing 7ft, so it’s getting into the "too big for beginners" territory. For intermediate and above, with glassy conditions and that WNW direction lining up well with the optimum, this is your window. Keep in mind it’s a river break, so with that period and size, it could be a bit straight, but the clean conditions make it worth a look. Crowds are possible here, so expect company.

The afternoon on Friday gets a bit choppier as a cross-shore breeze picks up, and the conditions go marginal.

Saturday the 29th morning is also glassy but with a much smaller 4ft NW swell at 8 seconds. It’s surfable, but very ordinary. The energy is low at 167. Not a standout, but if you’re desperate for a paddle, it’s clean.

The following week, from Sunday the 30th of August through to Saturday the 5th of September, is largely made up of clean, cross-offshore winds, but with small swell ranging from 3ft to 5ft and periods between 8 and 10 seconds. The energy levels are moderate. A few of these sessions are described as "expect good surf conditions" or "marginal," but nothing really jumps out as epic. The Monday the 31st morning is the pick of this stretch, with a clean 4ft WNW swell at 10 seconds, cross-offshore N winds, and a solid 246 energy reading. It’s consistent and rideable, but not the headline act.

Now, for the true standout of the entire outlook, you have to look ahead to Sunday the 6th of September morning. This is a beauty. Clean, cross-offshore winds with barely a breeze, and a solid 6ft NW groundswell with an 11-second period. The combined energy jumps to 737, which is strong. The conditions are expected to be very good. This is the best option if you’ve got the patience to wait. But then, hold on.

Monday the 7th of September is for the experts only. The morning brings a 5ft W swell with a massive 21-second period – that’s a very long period groundswell. The combined energy is huge: 2639. Conditions are clean with cross-offshore wind. This is excellent for experienced surfers, but for a river break, that super long period can make the waves break a bit too straight. The afternoon is even bigger, with an 8ft W swell at 19 seconds and an energy reading of 5375. It’s too big for this break, so only the most skilled should even consider it.

Tuesday the 8th of September is also too big for the break, with an 12ft WNW swell at 14 seconds and wind and tide favorable, but that’s serious, serious size. Experts only, and with caution.

So to sum it up: sit through the early junk. The real action starts on Friday the 28th of August morning with that glassy, solid 7ft swell. The next big one to circle on your calendar is Sunday the 6th of September morning for clean, strong groundswell. The biggest and most powerful swells hit on the 7th and 8th, but those are only for the brave and the skilled. If you’re a beginner, stay clear of anything over 5ft, and especially stay away from the 7th and 8th.

Rusty.

Short Range Forecast

Heavy rain (total 66mm), heaviest during Wed morning. Warm (max 21°C on Tue morning, min 15°C on Wed night). Winds increasing (calm on Mon night, fresh winds from the SSE by Wed morning).

Days 5-7 Weather Summary

Light rain (total 4mm), mostly falling on Thu afternoon. Warm (max 21°C on Sat afternoon, min 15°C on Fri night). Wind will be generally light.

Mon
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
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
0
0
0
0
0
0
0
0
!
!
1
2
1
0
1
1
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.2
SSW
8
1.2
SW
7
0.7
W
7
0.9
W
6
0.9
WNW
6
1.1
SSW
5
1.7
WSW
7
1.8
WSW
8
1.4
WSW
8
1.2
W
8
2.2
W
12
2.1
WNW
10
1.7
WNW
10
1.6
NW
9
1.1
NW
8
1.1
NW
8
1.2
WNW
8
1.1
WNW
8
1.1
WNW
8
1.2
WNW
8
Wave Graph
Metric surfscale
Energy kJ
650
147
53
66
55
57
259
437
238
177
1392
952
574
371
167
140
162
142
142
193
Wind (km/h)
25
SW
10
S
10
SSW
15
SW
10
SSE
35
SSE
20
WSW
15
SSE
15
SSW
15
SW
10
SE
0
S
15
WNW
10
NNE
0
NE
15
NW
5
NNE
10
NNW
20
NNW
10
NNE
Wind State
on
cross-on
on
on
cross
cross-on
cross-on
cross-on
cross-on
on
cross
glassy
cross
off
glassy
cross
cross-off
cross-off
cross-off
cross-off
High Tide
2:09AM2.67m
2:21PM2.96m
2:45AM2.85m
2:56PM3.15m
3:17AM3.02m
3:28PM3.31m
3:48AM3.18m
4:00PM3.44m
4:19AM3.30m
4:32PM3.52m
4:52AM3.38m
5:06PM3.53m
Low Tide
7:57PM1.22m
8:02AM1.23m
8:34PM1.03m
8:39AM1.04m
9:07PM0.85m
9:12AM0.85m
9:38PM0.69m
9:45AM0.70m
10:09PM0.57m
10:18AM0.59m
10:41PM0.50m
10:52AM0.54m
11:14PM0.48m
rain showers
light rain
rain showers
clear
part cloud
rain showers
thunderstorm
heavy rain
heavy rain
thunderstorm
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:52
6:54
6:54
6:56
6:56
6:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:22
8:21
8:19
8:16
8:15
8:14
8:12
 mm
2
2
1
24
8
11
18
4
Temp °C
20
19
21
21
18
19
18
17
16
18
16
19
19
17
20
21
18
21
21
18
Feels °C
18
21
21
20
18
15
16
17
14
17
15
18
17
16
19
19
18
20
19
16
  • Map Icons:
  • Break
  • 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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