Viana do Castelo Surf Break

Lat Long: 41.69° N 8.85° W

Viana do Castelo Surf Forecast and Surf Report

Issued: 12 am 22 Aug 2026 (local time)

Forecast update in  hr  min

Today's Viana do Castelo sea temperature is
18.3° C
0.9° 

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 22 Aug 2026:

  • Best quality surf: Wednesday 26 Aug, 10PM (local time) - 7.5ft (2.3m), 9s period, WNW swell with glassy winds.
  • Most powerful swell: Friday 28 Aug, 1PM (local time) - 8ft (2.5m), 10s period, WNW swell with 1,508 kJ wave energy.
  • Next surfable swell (1★+): Saturday 22 Aug, 7AM (local time) - 4ft (1.2m), 9s period with NNW 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 Saturday (Aug 22) at 7AM. The primary swell is predicted to be 1.2m and 9s period with a secondary swell of 0.5m and 9s. 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 2.5m 10s and forecast to arrive on Friday (Aug 28) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+) 7AM (Sat 22nd Aug)4ft (1.2m) 9s
Best Surf10PM (Wed 26th Aug)7.5ft (2.3m) 9s
Most Powerful 1PM (Fri 28th Aug)8ft (2.5m) 10s

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


The Lowdown

Alright, Rusty here, checking in from the break.

Right now, we’re in a bit of a flat spell. This river mouth isn’t doing much for a few days, with choppy, cross-shore winds messing up anything that tries to form. The wait will be worth it though, because things finally start to clean up later in the week.

Our first real chance to paddle out comes on Thursday the 27th in the morning. Viana do Castelo will see a clean 6 ft swell from the WNW with an 8-second period. The wind is a light, cross-offshore breeze from the NNW, so the face will be pretty clean with only a slight air moving. Wave energy is moderate (386). It’s not the biggest swell, but it’s the first day we get proper conditions after a few days of slop.

The standout of this whole outlook is Friday the 28th. That morning, it goes glassy. Absolutely flat calm, zero wind, with a solid 8 ft groundswell rolling in from the WNW. That’s a big number and the combined energy jumps to strong (1324). The period is 10 seconds, so there’s decent power behind it. That said, this is a river break, and 8 ft is getting sizeable; I’d say this one is for experienced heads only. The crowds here can be an issue, and on a morning this good, expect the lineup to be busy. I would not recommend this for beginners.

Saturday the 29th morning pulls back a touch to a more manageable 5 ft from the WNW with that same 10-second period. The wind is back to a light cross-offshore from the NNW, keeping it clean. Wave energy is still solid (788). This is probably the best bet for a strong session that isn’t as intimidating as Friday.

After that, the swell hangs around but drops in size through the end of August and into the start of September. Clean mornings with cross-offshore winds pop up on the 30th (4 ft) and the 31st (4 ft), but the wind picks up stronger, especially on the 31st afternoon when a fresh 19 mph breeze hits.

Heading into September, we get another spike. The morning of Wednesday the 2nd of September shows a clean 7 ft swell from the WNW, period of 10 seconds, with a very light cross-offshore breeze. Wave energy is up there again (844). Like the 28th, this is big for the spot and considered too large for most, so we’re looking at an expert-only window.

The biggest pulse of the whole run hits on Thursday the 3rd of September. That morning is dead flat calm, glassy, with 8 ft from the NW and a long 11-second period. The energy number blows up to 1346. That is a serious groundswell with serious power. It'll be a sight to see, but this river mouth will be absolutely thumping and likely unruly for anyone without deep experience. The direction is a good match for the spot's ideal W-NW window, but the size is the limiting factor.

To wrap it up, we’ve got a slow start, a few good clean days from the 27th through the 31st, and then a run of oversized, high-energy days for the experts starting on the 2nd of September. If you’re intermediate, aim for the 29th. If you’re seasoned and want a challenge, the 28th of August or the morning of the 3rd of September is your ticket. If you're learning, give this whole period a miss, especially when it's pushing 6 ft or more.

Stay safe out there.
Rusty

Short Range Forecast

Heavy rain (total 29mm), heaviest during Sun morning. Warm (max 23°C on Sun afternoon, min 15°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 19mm), heaviest on Wed afternoon. Warm (max 21°C on Tue morning, min 16°C on Wed night). Wind will be generally light.

Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
AM
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
3
1
0
2
0
0
0
0
0
0
0
0
!
2
0
2
!
!
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
NNW
9
0.8
NNW
8
1.5
W
12
1.5
W
10
1.5
WSW
10
1.7
SW
9
1.6
SW
8
1.6
SW
8
1.2
SSW
7
0.8
SW
7
0.8
WNW
6
0.6
WNW
6
1.2
WSW
7
1.3
WSW
7
2.2
WNW
9
1.7
WNW
8
1.3
WNW
8
1.3
WNW
8
2.5
WNW
10
2.5
WNW
10
1.9
WNW
10
Wave Graph
Metric surfscale
Energy kJ
92
92
617
449
399
450
338
291
142
63
53
25
117
141
741
381
196
202
1324
1300
702
Wind (km/h)
15
SSE
10
WSW
10
ESE
15
ESE
20
SE
15
ESE
25
SE
20
SSE
10
S
10
S
15
SSW
15
SE
25
SSE
20
SSW
5
SSE
5
NNW
15
NW
10
NNE
0
ENE
15
WNW
5
NE
Wind State
cross-on
on
cross-off
cross-off
cross
cross-off
cross
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
glassy
cross-off
cross
off
glassy
cross
off
High Tide
11:23AM2.48m
00:13AM2.37m
12:43PM2.59m
1:23AM2.50m
1:39PM2.77m
2:09AM2.67m
2:21PM2.96m
2:45AM2.85m
2:56PM3.15m
3:17AM3.02m
3:28PM3.31m
3:48AM3.18m
4:00PM3.44m
Low Tide
4:49AM1.60m
6:00PM1.55m
6:18AM1.55m
7:10PM1.41m
7:18AM1.41m
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
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rain showers
heavy rain
part cloud
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light rain
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part cloud
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thunderstorm
thunderstorm
rain showers
clear
clear
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:50
6:50
6:52
6:52
6:54
6:54
6:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:24
8:23
8:22
8:21
8:19
8:16
8:15
 mm
1
21
4
1
2
6
1
2
3
5
2
Temp °C
20
21
18
17
23
20
21
20
19
21
21
18
20
20
17
19
19
17
19
19
17
Feels °C
19
20
16
15
20
17
18
19
20
20
20
18
18
18
18
17
17
16
18
17
16
  • Map Icons:
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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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