Surf Forecasts:
Viana do Castelo surf forecast from 3 Sep 2026:
- Best quality surf: Saturday 5 Sep, 7PM (local time) - 4.5ft (1.3m), 13s period, NW swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 10AM (local time) - 6.5ft (2.0m), 12s period, WNW swell with 1,006 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 4PM (local time) - 2ft (0.6m), 9s period with WNW 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 Thursday (Sep 03) at 4PM. The primary swell is predicted to be 0.6m and 9s period with a secondary swell of 0.4m and 5s. 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 2.0m 12s 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 1.6m 6s period and expected on Tuesday (Sep 08) at 7PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Thu 3rd Sep) | 2ft (0.6m) 9s |
| Best Surf | 7PM (Sat 5th Sep) | 4.5ft (1.3m) 13s |
| Most Powerful | 10AM (Mon 7th Sep) | 6.5ft (2.0m) 12s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright folks, Rusty here. We’re looking at a pretty mixed bag for Viana do Castelo over the next couple of weeks. The first few days are a write-off, so don't bother paddling out just yet. We’ve got a gap of weak, small surf and wonky winds through Thursday the 3rd and Friday the 4th. Nothing to get excited about. Things start to build from the weekend, but there’s only one or two real standouts in the whole run.
The best bet of the whole forecast window looks like Sunday morning, September 6th. The river mouth at Viana do Castelo will be setting up with a clean 4ft NW groundswell. The wind is a light cross-offshore from the NNW at 6 mph, so the faces will be smooth. Energy is moderate (422), but the long 11-second period means proper lines, which is a classic river mouth or point break scenario. Water temp is about average for the time of year, so don’t expect any surprises.
Monday the 7th morning brings the biggest swell of the run – a solid 7ft from the WNW with a long 12-second period. That’s pushing expert territory, and the combined energy is strong at 1006. The cross-offshore wind from the NNW at 9 mph will hold it together, but this is for experienced crew only. It’s a big, powerful wave.
After Monday, it drops off badly. Tuesday the 8th goes flat and windy, and while Wednesday the 9th sees a bump to 5ft, the short 8-second period and stronger winds make it messy. There’s a long dry spell from the 11th through the 13th where the surf is tiny and weak. A slight pulse shows up around the 15th and 16th, but the wind is onshore or cross-shore, so the quality is ordinary. The very end of the run on the 18th looks flat again.
So to sum it up: Sunday morning the 6th is your golden window – clean, chest-high, and glassy. Monday morning the 7th for the big-wave hunters. The rest of the fortnight, don't hold your breath. This river break can fire, but it needs the right date.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Thu morning, min 22°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Tue afternoon, min 15°C on Mon night). Winds increasing (calm on Sat night, fresh winds from the NNW by Mon afternoon). | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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 9 | WNW 9 | WNW 8 | WNW 8 | WNW 9 | WNW 9 | NW 15 | NW 13 | NW 12 | NW 11 | NW 10 | WNW 13 | WNW 12 | WNW 11 | WNW 10 | NW 8 | W 8 | NNW 7 | NNW 8 | NNW 8 | NNW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 59 | 59 | 78 | 111 | 124 | 124 | 178 | 495 | 555 | 297 | 180 | 755 | 1006 | 732 | 339 | 102 | 49 | 272 | 230 | 273 | 302 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | off | cross | glassy | off | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 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 | 2:44PM3.40m | 3:11AM3.31m | |||||||
Low Tide | 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 | 8:28AM0.80m | 8:57PM0.56m | ||||||||
 | |  |  |  |  | | | | | | | | | | | | | | | | |
 | 7:01 | — | — | 7:03 | — | — | 7:03 | — | — | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — |
 | — | 8:06 | — | — | 8:04 | — | — | 8:02 | — | — | 8:00 | — | — | 7:59 | — | — | 7:57 | — | — | 7:55 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 28 | 27 | 28 | 29 | 29 | 27 | 26 | 22 | 22 | 22 | 19 | 22 | 21 | 19 | 22 | 23 | 19 | 23 | 24 | 19 |
Feels °C | 28 | 26 | 25 | 26 | 29 | 27 | 27 | 25 | 22 | 21 | 20 | 18 | 20 | 18 | 17 | 17 | 18 | 16 | 19 | 19 | 17 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | WNW 9 | WNW 8 | WNW 8 | WNW 9 | WNW 9 | NW 9 | NW 13 | NW 12 | NW 11 | NW 10 | WNW 13 | WNW 12 | WNW 11 | WNW 10 | NW 8 | W 8 | NW 10 | NNW 8 | W 7 | NNW 8 |
| kJ | 59 | 59 | 78 | 111 | 124 | 124 | 73 | 495 | 555 | 297 | 180 | 755 | 1006 | 732 | 339 | 102 | 49 | 25 | 230 | 4 | 302 |
Swell 2 Height (m) Direction Period (s) | NNW 5 | NW 5 | NNW 8 | SW 14 | NW 6 | NNW 6 | W 9 | WNW 9 | WNW 8 | WNW 9 | WNW 16 | NW 10 | — | NNW 9 | — | W 9 | — | — | — | — | W 7 |
| kJ | 18 | 7 | 7 | 7 | 8 | 6 | 60 | 124 | 73 | 119 | 48 | 94 | — | 8 | — | 40 | — | — | — | — | 4 |
Swell 3 Height (m) Direction Period (s) | SSW 15 | SSW 14 | SW 14 | — | SW 13 | SW 13 | NW 15 | SW 12 | SW 12 | SW 12 | SW 12 | — | — | — | — | — | — | — | — | — | W 13 |
| kJ | 21 | 20 | 8 | — | 7 | 7 | 178 | 6 | 6 | 6 | 5 | — | — | — | — | — | — | — | — | — | 3 |
Wind waves Height (m) Direction Period (s) | — | — | NNW 3 | — | S 3 | — | — | — | — | — | WNW 9 | NNW 3 | — | NW 5 | NNW 6 | NNW 5 | NNW 5 | NNW 7 | — | NNW 8 | — |
| kJ | — | — | 1 | — | 1 | — | — | — | — | — | 130 | 4 | — | 66 | 107 | 61 | 83 | 272 | — | 273 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 0 | 0 | 10 | 0 | 0 | 10 | 111 | 100 | 0 | 100 | 5 | 329 | 120 | 120 | 251 | 130 | 130 | 2 | 130 | 0 |
Best forecast wave conditions in Douro and Minho | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
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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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