Surf Forecasts:
Viana do Castelo surf forecast from 2 Sep 2026:
- Best quality surf: Saturday 5 Sep, 4PM (local time) - 4ft (1.2m), 10s period, NW swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 10AM (local time) - 5ft (1.6m), 13s period, WNW swell with 762 kJ wave energy.
- Next surfable swell (1★+): Wednesday 2 Sep, 7AM (local time) - 2ft (0.6m), 8s 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 Wednesday (Sep 02) at 7AM. The primary swell is predicted to be 0.6m and 8s period with a secondary swell of 0.3m and 8s. 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 13s and forecast to arrive on Monday (Sep 07) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Monday (Sep 07) at 4PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Wed 2nd Sep) | 2ft (0.6m) 8s |
| Best Surf | 4PM (Sat 5th Sep) | 4ft (1.2m) 10s |
| Most Powerful | 10AM (Mon 7th Sep) | 5ft (1.6m) 13s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down what’s coming for our local spot.
We’ve got a slow start with tiny, weak surf for the first few days, so don’t rush out. The good stuff starts to build toward the weekend and into the following week.
Viana do Castelo is a river mouth setup, and it’s fairly consistent, but it doesn’t always break. The first real chance comes on Saturday morning, September 5th. We’ve got clean 4ft swell from the NW with a 9-second period. The wind is light offshore from the NE, keeping things clean. The combined energy is moderate (315). It’s not big, but it’s a start. Saturday afternoon looks even better: 4ft NW swell, 10-second period, and the wave energy is pumping (564). The cross-offshore wind from the NNW will keep it tidy. This is probably the best window of the first week, and crowds are often a factor here, so expect company.
Sunday the 6th turns messy with cross-on winds, so we’ll skip that.
Now, Monday morning, September 7th is a standout. The swell jumps to 5ft from the WNW with a 13-second period. That’s a proper groundswell with serious energy behind it (802). The wind is cross-offshore from the NNW, so it’ll be clean. This is a lot of power for a river mouth, so it’s more for the experienced crew. The afternoon stays solid but the wind picks up strong.
The following week sees a few more fun windows. Tuesday morning, September 8th has 4ft from the WNW at 10 seconds, with light cross-offshore winds and clean conditions. Energy is moderate (323). Thursday morning, September 10th is another clean option with 3ft WNW swell, 10-second period, light breeze, and good energy (274).
Looking further out, Monday morning, September 14th brings a clean 3ft swell from the NW with an 11-second period and light east winds. Energy is solid (394). The Wednesday and Thursday mornings, September 16th and 17th, both have chest-high 3-4ft swell from the W/NW with 11-12 second periods, light winds, and clean conditions. Those are promising but less certain this far out.
Water temp is about average for the time of year, nothing unusual there.
The swell gets a bit bigger toward the end of the second week, but it’s paired with strong winds and short periods, so it’s mostly a pass.
Overall, the standout is Saturday afternoon, September 5th, and the big groundswell on Monday morning, September 7th is the one for the experienced crew.
Stay stoked,
Rusty
Short Range ForecastMostly dry. Warm (max 30°C on Fri afternoon, min 17°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sat night. Warm (max 35°C on Sat morning, min 18°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | WNW 8 | WNW 8 | NW 6 | WNW 9 | WNW 9 | WNW 8 | WNW 8 | WNW 9 | NW 9 | NW 9 | NW 10 | NW 12 | NW 11 | NW 11 | W 14 | WNW 13 | WNW 12 | WNW 11 | WNW 10 | NW 9 | NW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 41 | 24 | 94 | 59 | 59 | 78 | 80 | 99 | 220 | 176 | 308 | 511 | 303 | 220 | 423 | 762 | 559 | 359 | 235 | 351 | 98 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | glassy | cross | cross-off | cross-off | cross | glassy | off | cross-off | cross-on | cross-on | on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 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 | 12:57PM2.98m | 1:37AM2.92m | 1:56PM3.21m | 2:29AM3.14m | |||||||
Low Tide | 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 | 6:35AM1.21m | 7:21PM0.98m | 7:39AM1.00m | 8:14PM0.75m | ||||||||
 | |  | | | | |  |  | |  |  | | | | | | | | | | |
 | 7:01 | — | — | 7:01 | — | — | 7:03 | — | — | 7:03 | — | — | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — |
 | — | 8:07 | — | — | 8:06 | — | — | 8:04 | — | — | 8:02 | — | — | 8:00 | — | — | 7:59 | — | — | 7:57 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 3 | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 26 | 25 | 28 | 29 | 25 | 28 | 30 | 29 | 35 | 34 | 24 | 25 | 24 | 19 | 24 | 22 | 20 | 23 | 21 | 17 |
Feels °C | 22 | 23 | 23 | 27 | 28 | 23 | 26 | 27 | 26 | 34 | 32 | 23 | 25 | 26 | 19 | 23 | 19 | 19 | 22 | 18 | 14 |
Swell 1 Height (m) Direction Period (s) | WNW 8 | WNW 8 | NW 6 | WNW 9 | WNW 9 | WNW 8 | WNW 8 | WNW 9 | NW 9 | NW 9 | NW 10 | NW 12 | NW 11 | NW 11 | W 14 | WNW 13 | WNW 12 | WNW 11 | WNW 10 | — | NW 8 |
| kJ | 41 | 22 | 94 | 59 | 59 | 78 | 80 | 99 | 220 | 176 | 308 | 511 | 303 | 220 | 423 | 762 | 559 | 359 | 235 | — | 98 |
Swell 2 Height (m) Direction Period (s) | NNW 8 | SSW 16 | WNW 9 | NNW 6 | NW 6 | NNW 8 | SW 14 | SW 13 | SW 13 | NW 11 | NW 13 | W 9 | WNW 9 | WNW 9 | NW 10 | NW 9 | — | — | — | — | NNW 11 |
| kJ | 11 | 24 | 17 | 20 | 8 | 7 | 7 | 7 | 7 | 101 | 250 | 64 | 62 | 80 | 98 | 40 | — | — | — | — | 12 |
Swell 3 Height (m) Direction Period (s) | SSW 15 | W 11 | SSW 16 | SSW 15 | SW 14 | SW 14 | — | — | NW 15 | NW 16 | SW 13 | SW 12 | SW 12 | W 17 | W 8 | — | — | — | — | — | — |
| kJ | 21 | 2 | 24 | 21 | 8 | 8 | — | — | 8 | 38 | 6 | 6 | 6 | 22 | 35 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 5 | NW 5 | — | — | — | NNW 4 | NW 4 | NW 5 | — | — | — | — | — | NW 3 | NW 8 | NW 5 | NNW 5 | NNW 6 | NNW 6 | NW 9 | NNW 6 |
| kJ | 27 | 25 | — | — | — | 5 | 8 | 25 | — | — | — | — | — | 2 | 105 | 33 | 90 | 127 | 88 | 351 | 116 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 100 | 0 | 0 | 18 | 0 | 0 | 14 | 0 | 0 | 0 | 18 | 10 | 100 | 0 | 251 | 120 | 0 | 0 | 100 | 100 |
Best forecast wave conditions in Douro and Minho | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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