Viana do Castelo Surf Break

Lat Long: 41.69° N 8.85° W

Viana do Castelo Surf Forecast and Surf Report

Issued: 6 pm 31 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 1 Sep 2026:

  • Best quality surf: Tuesday 1 Sep, 4AM (local time) - 5ft (1.6m), 9s period, NW swell with cross-offshore winds.
  • Most powerful swell: Tuesday 1 Sep, 4AM (local time) - 5ft (1.6m), 9s period, NW swell with 440 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 1 Sep, 4AM (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 Tuesday (Sep 01) at 4AM. The primary swell is predicted to be 1.6m and 9s period with a secondary swell of 0.1m and 16s. 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 9s and forecast to arrive on Tuesday (Sep 01) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Wednesday (Sep 02) at 7PM.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+) 4AM (Tue 1st Sep)5ft (1.6m) 9s
Best Surf 4AM (Tue 1st Sep)5ft (1.6m) 9s
Most Powerful 4AM (Tue 1st Sep)5ft (1.6m) 9s

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


The Lowdown

Alright, Rusty here. Let’s take a look at what’s cooking for our local stretch over the next couple of weeks. Honestly, it’s a pretty flat and frustrating run for the most part. The good news is, there’s a bit of a pulse early on, but after that, things drop right off. For those of you with a shortboard and a long memory, we do have one session that stands out above the rest.

The first real chance to get wet kicks off on Monday afternoon, 31 August. Viana do Castelo (river) will be seeing a solid 6ft swell from the NW. That combined energy is sitting at a moderate 665, so there’s some push behind it, but it’s a bit of a mixed bag. The wind is a cross-off from the NNW at 16 mph, which will keep the surface reasonably clean. The water temp is 65°, which is about average for the time of year, so nothing unusual there. This is the best on offer for the whole outlook, but it’s only for the more experienced crew—that 6ft is a bit much for beginners, especially on a river mouth that can get shifty.

Now, for the standout moment. That’s Tuesday morning, 1 September. The swell drops to a more manageable 5ft from the NW, but the wind is the real story here. A light N breeze at 6 mph, cross-off, making for clean, lined-up waves. The combined energy is still moderate at 369, and the period of 9 seconds means decent shape. This is the cleanest, most user-friendly window of the entire forecast. If you can only paddle out once, this is it. The crowd situation at Viana do Castelo can be an issue at times, so get in early.

After Tuesday afternoon, the whole thing goes flat. Wednesday the 2nd of September drops to a tiny 2ft, and by Wednesday afternoon we’re looking at a pathetic 0.7ft with a period of 16 seconds—that’s a ghost swell. The energy is a weak 48. Forget it.

The rest of the first week and into the second is a long, drawn-out gap of mostly poor or very ordinary conditions. There’s a glassy window on Thursday morning, 3 September, with a light SSE breeze at 3 mph and a tiny 2ft swell, but it’s not going to get the heart racing. Saturday afternoon the 5th sees a clean 3ft from the WNW with an offshore NE breeze at 9 mph, but it’s still small.

From the 6th of September onwards, it’s a bleak picture. Swell stays small to medium, but the wind is either onshore, cross-onshore, or howling cross-off at 19 to 25 mph. The wave energy drops into the weak range (80-150) for most of it. There’s a moment on Wednesday afternoon, 9 September, with a glassy surface and 4ft from the NW, but the period is a short 7 seconds and the energy is only 154. It’s surfable, but ordinary. By the second week, the wind is just too strong to make anything worthwhile, especially on the 10th and 11th with fresh to strong breezes.

In short: grab that Tuesday morning, 1 September, because after that, you’re looking at a lot of days where you’re better off cleaning the wax off your board and waiting for the next system. The setup here is a river mouth, so when the swell is small and the wind is light, it can work, but the long-range stuff is too unreliable to get excited about. If the wind keeps up like this, some of those bigger, choppier days might be more interesting for the kite crew than for us paddle surfers.

Stay stoked, but keep your expectations in check for the next fortnight.

Rusty

Short Range Forecast

Mostly dry. Warm (max 26°C on Wed afternoon, min 15°C on Mon night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 34°C on Sat afternoon, min 21°C on Thu night). Wind will be generally light.

Mon
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
3
2
1
2
1
0
1
1
0
1
1
1
1
1
1
0
0
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.8
NW
10
1.8
NW
9
1.5
NW
9
1.5
NW
9
1.5
NW
8
0.6
WNW
8
0.4
WNW
8
1.2
NW
6
0.6
WNW
9
0.6
WNW
9
0.8
WNW
8
0.8
WNW
8
0.9
WNW
9
0.9
WNW
9
0.8
WNW
9
0.9
WNW
9
0.9
WNW
9
1
NW
11
1
NW
11
0.9
NW
11
Wave Graph
Metric surfscale
Energy kJ
653
586
359
351
297
41
24
120
59
59
76
92
129
116
90
127
118
233
224
163
Wind (km/h)
25
NNW
15
N
10
N
25
NNW
15
N
10
N
20
NNW
10
NNE
5
SSE
5
SW
0
ENE
5
NNW
15
NNW
5
NE
10
E
15
NE
15
SSE
15
SSE
10
W
15
N
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
glassy
on
glassy
cross-off
cross-off
off
cross-off
off
cross
cross-on
cross-on
cross-off
High Tide
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
11:36AM2.81m
00:27AM2.70m
Low Tide
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
5:07AM1.34m
6:10PM1.20m
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
cloud
clear
part cloud
cloud
clear
part cloud
clear
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:00
7:01
7:01
7:03
7:03
7:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:10
8:08
8:07
8:06
8:04
8:02
8:00
 mm
Temp °C
20
17
20
20
18
24
26
24
26
27
22
26
29
27
29
34
31
23
23
19
Feels °C
16
15
18
18
16
22
23
22
25
27
22
24
26
24
29
31
30
22
24
19
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
How to use the Wavefinder 
submit an eyeball surf report

Quick surf report for Viana do Castelo:

join our community of surf reporters

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Viana do Castelo surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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.

Nearest locationNearest