Surf Forecasts:
Viana do Castelo surf forecast from 27 Aug 2026:
- Best quality surf: Friday 28 Aug, 7AM (local time) - 7ft (2.1m), 11s period, W swell with glassy winds.
- Most powerful swell: Friday 28 Aug, 1PM (local time) - 8ft (2.4m), 10s period, WNW swell with 1,198 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 7AM (local time) - 7ft (2.1m), 11s 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 7AM. The primary swell is predicted to be 2.1m and 11s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Viana do Castelo in the next 16 days are 2.4m 10s and forecast to arrive on Friday (Aug 28) at 1PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Tuesday (Sep 01) at 4AM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Fri 28th Aug) | 7ft (2.1m) 11s |
| Best Surf | 7AM (Fri 28th Aug) | 7ft (2.1m) 11s |
| Most Powerful | 1PM (Fri 28th Aug) | 8ft (2.4m) 10s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright, grab your wettie, let's talk about Viana do Castelo.
We've got a weird run ahead. The next couple of days are a total write-off for a paddle. Thursday’s offering a messy 3ft cross-on with rain – that’s a hard pass from me. The water’s sitting at about 64°, a bit cooler than usual for late August, so you’ll feel the chill.
Things suddenly fire up on Friday the 28th though, and that’s your standout window. Friday morning brings a solid 7ft W/SW groundswell with an 11-second period – plenty of energy. The wind is a clean cross-off from the ESE. This is the pick of the forecast. The river mouth setup usually loves a straight west swell, and you’ll get proper lines. Be warned though, at 7ft it's pushing into expert territory, especially on the paddle out between sets. Friday afternoon stays sizeable at 8ft with light cross-on bumps, but the morning is your session.
After that excitement, we hit a big lull. From Saturday the 29th right through to the end of the first week of September, it’s pretty flat and ordinary. There's a little bump on Monday the 31st with 6ft NW swell and clean cross-off winds but the overall quality is just mediocre. You’ll get a few rideable but unspectacular waves.
The second week stays quiet, mostly small 2ft to 3ft stuff. There is a brief flicker on Wednesday the 9th of September – glassy conditions with a 4ft WNW groundswell that has a lovely 12-second period. That’s a gem for the river mouth if it lines up. The energy is solid, but it’s a long-range call, so fingers crossed.
Overall, if you want to score, your one and only true standout is Friday morning the 28th. Get on it. The rest of the 16 days is mostly small, clean but weak waves, so don’t expect much else.
Rusty.
Short Range ForecastHeavy rain (total 26mm), heaviest during Thu morning. Warm (max 21°C on Sat morning, min 15°C on Thu morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Mon morning, min 15°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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) | W 7 | W 7 | W 10 | WNW 11 | WNW 10 | NW 9 | NW 8 | NW 8 | WNW 8 | NW 9 | NW 9 | NW 9 | NW 11 | NW 10 | NW 10 | NW 9 | NW 9 | NW 8 | NW 8 | NW 7 | NNW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 100 | 100 | 259 | 1051 | 1186 | 599 | 274 | 221 | 213 | 414 | 365 | 281 | 639 | 680 | 673 | 359 | 351 | 355 | 160 | 118 | 159 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-off | cross-on | glassy | cross-on | cross-on | glassy | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 3:28PM3.31m | 3:48AM3.18m | 4:00PM3.44m | 4:19AM3.30m | 4:32PM3.52m | 4:52AM3.38m | 5:06PM3.53m | 5:26AM3.40m | 5:42PM3.47m | 6:03AM3.36m | 6:21PM3.33m | 6:45AM3.25m | 7:05PM3.14m | ||||||||
Low Tide | 9:38PM0.69m | 9:45AM0.70m | 10:09PM0.57m | 10:18AM0.59m | 10:41PM0.50m | 10:52AM0.54m | 11:14PM0.48m | 11:28AM0.56m | 11:50PM0.54m | 12:07PM0.65m | 00:29AM0.66m | 12:52PM0.81m | 1:14AM0.85m | ||||||||
 |  |  | |  |  | | |  | | | | | | | | | | | | | |
 | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — |
 | — | 8:16 | — | — | 8:15 | — | — | 8:14 | — | — | 8:12 | — | — | 8:10 | — | — | 8:08 | — | — | 8:07 | — |
mm | 17 | 3 | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 18 | 17 | 19 | 20 | 19 | 21 | 21 | 19 | 21 | 21 | 18 | 22 | 20 | 16 | 21 | 21 | 19 | 23 | 25 | 22 |
Feels °C | 13 | 16 | 16 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 20 | 16 | 19 | 17 | 14 | 17 | 17 | 16 | 21 | 22 | 20 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 7 | WSW 7 | WNW 11 | WNW 10 | NW 9 | NW 8 | NW 8 | WNW 8 | NW 9 | NW 9 | NW 9 | NW 11 | NW 10 | NW 10 | NW 9 | SW 16 | SW 15 | NW 8 | SSW 16 | NNW 7 |
| kJ | 100 | 100 | 121 | 1051 | 1186 | 599 | 274 | 221 | 213 | 414 | 365 | 281 | 639 | 680 | 673 | 359 | 9 | 9 | 160 | 24 | 159 |
Swell 2 Height (m) Direction Period (s) | NW 8 | SSW 6 | W 10 | — | — | — | — | — | — | — | — | — | — | SW 18 | SW 16 | SW 16 | — | — | SW 15 | — | SW 16 |
| kJ | 57 | 41 | 259 | — | — | — | — | — | — | — | — | — | — | 12 | 10 | 10 | — | — | 8 | — | 10 |
Swell 3 Height (m) Direction Period (s) | SW 11 | NW 8 | NW 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 5 | 58 | 156 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | — | — | — | — | — | — | — | — | — | — | N 4 | NNW 4 | — | — | — | NW 9 | NW 8 | — | NW 7 | — |
| kJ | 33 | — | — | — | — | — | — | — | — | — | — | 6 | 23 | — | — | — | 351 | 355 | — | 118 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 104 | 104 | 10 | 2 | 104 | 0 | 18 | 104 | 0 | 2 | 100 | 0 | 0 | 100 | 0 | 0 | 120 | 2 | 0 | 182 | 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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