Surf Forecasts:
Viana do Castelo surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 10PM (local time) - 5.5ft (1.7m), 10s period, NW swell with cross-offshore winds.
- Most powerful swell: Sunday 23 Aug, 1AM (local time) - 5ft (1.6m), 12s period, W swell with 714 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 10PM (local time) - 5.5ft (1.7m), 10s 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 Friday (Aug 21) at 10PM. The primary swell is predicted to be 1.7m and 10s 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 1.6m 12s and forecast to arrive on Sunday (Aug 23) at 1AM. 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 5s period and expected on Friday (Aug 21) at 7PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Fri 21st Aug) | 5.5ft (1.7m) 10s |
| Best Surf | 10PM (Fri 21st Aug) | 5.5ft (1.7m) 10s |
| Most Powerful | 1AM (Sun 23rd Aug) | 5ft (1.6m) 12s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright folks, Rusty here, staring at the charts for our local corner.
So, here's the skinny for the next couple weeks. We've got a bit of a mixed bag ahead. The wind is gonna be our main fight for the next week or so. The real standout isn't until about two weeks out, so don't get too fired up just yet. We're surfing a river mouth, so everything has to fall into place.
Our main spot is Viana do Castelo. The water is sitting around 65°, which is a hair cooler than usual for this time of year, nothin' crazy.
Let's talk the immediate future. The first few days are a grind. Friday the 21st has some size – 5.6ft from the NW with a medium 10-second period and a good amount of energy. But that wind is cross-off and honking at 18 mph in the afternoon, so it'll be a mess. Not worth the paddle.
Saturday the 22nd and Sunday the 23rd are even worse, with wind on it and the swell dropping. Mostly poor conditions with some rain. The swell stays inconsistent and mid-range the whole first week. We get a few windows – like Thursday morning the 27th, where it's 5.2ft and dead glassy – that's the sneaky good session. But it's short.
The next clear morning we get is Saturday the 29th. That's a 4.9ft NW swell with a nice cross-off breeze and clean conditions. That's a good one to set your alarm for. Sunday the 30th morning is similar, 4.3ft with clean cross-off breezes. Good longboard or funboard waves for the river mouth. But remember, this spot can get crowded, and on those clean days it's likely.
Now here's the real standout. Keep your eye on Friday, September 4th. The morning looks killer. We've got a 5.6ft NW swell with a massive jump in power. The wind is light and cross-off from the NNW, so it'll be clean. That's the best combo we've got in the whole run. It's still a bit far out, so keep an eye on the updates, but that one has proper potential.
If you're an expert lookin' for some punch, the swell tops out around 7.2ft on Monday the 24th, but the wind is a mess – cross-on and fresh. That one is more of a kite session than a paddle day, honestly.
Alright, I'm signing off. Stay stoked.
Short Range ForecastModerate rain (total 10mm), heaviest on Sun morning. Warm (max 23°C on Sun afternoon, min 15°C on Fri night). Winds decreasing (fresh winds from the NNW on Fri afternoon, calm by Sat night). | Days 4-6 Weather SummaryHeavy rain (total 31mm), heaviest during Wed night. Warm (max 21°C on Tue morning, min 16°C on Wed night). Winds decreasing (fresh winds from the SSE on Mon afternoon, calm by Wed night). | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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) | NW 10 | NW 10 | NNW 10 | NNW 9 | NNW 8 | W 12 | W 10 | WSW 10 | SW 9 | SW 8 | SSW 8 | SW 8 | WSW 7 | W 7 | WNW 6 | WSW 7 | WSW 7 | W 8 | WNW 8 | W 8 | NW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 546 | 517 | 439 | 116 | 92 | 714 | 452 | 391 | 397 | 428 | 650 | 269 | 138 | 172 | 55 | 154 | 141 | 524 | 322 | 168 | 338 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-on | on | cross-off | on | cross | cross-off | cross | cross-on | on | cross-on | cross-on | cross | cross-on | on | cross-on | glassy | cross-on | cross |
High Tide | 10:36PM2.35m | 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 | ||||||||
Low Tide | 4:20PM1.58m | 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 | ||||||||
 | |  | |  |  |  | |  |  | | |  | | |  | |  |  | |  | |
 | 6:48 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — |
 | — | 8:27 | — | — | 8:24 | — | — | 8:23 | — | — | 8:22 | — | — | 8:21 | — | — | 8:19 | — | — | 8:16 | — |
mm | — | — | — | — | — | — | 7 | — | 3 | 3 | 4 | 8 | — | — | 2 | 3 | 1 | 10 | 1 | — | — |
Temp °C | 21 | 21 | 17 | 21 | 21 | 18 | 18 | 23 | 19 | 20 | 20 | 19 | 21 | 21 | 18 | 20 | 20 | 18 | 19 | 19 | 17 |
Feels °C | 16 | 16 | 16 | 20 | 20 | 17 | 17 | 21 | 19 | 18 | 16 | 20 | 20 | 20 | 18 | 19 | 19 | 17 | 17 | 16 | 18 |
Swell 1 Height (m) Direction Period (s) | NW 10 | W 9 | NNW 10 | NNW 9 | NNW 8 | W 12 | W 10 | WSW 10 | SW 9 | SW 8 | NNW 7 | N 6 | WSW 7 | W 7 | WNW 6 | WSW 7 | WSW 7 | W 8 | WNW 8 | W 8 | NW 8 |
| kJ | 546 | 39 | 439 | 116 | 92 | 714 | 452 | 391 | 397 | 428 | 5 | 1 | 138 | 172 | 55 | 154 | 141 | 524 | 322 | 168 | 338 |
Swell 2 Height (m) Direction Period (s) | SW 15 | SSW 15 | W 10 | NW 9 | W 9 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | W 9 | SW 13 | SW 12 | W 10 | NW 10 | NW 9 | WNW 8 | — | SW 11 | NW 8 | SW 11 |
| kJ | 9 | 21 | 47 | 51 | 38 | 44 | 11 | 11 | 10 | 10 | 2 | 7 | 6 | 2 | 15 | 21 | 41 | — | 5 | 154 | 5 |
Swell 3 Height (m) Direction Period (s) | SW 12 | W 11 | SSW 15 | W 9 | SSW 14 | SSW 14 | SSW 14 | SW 13 | SW 13 | SW 13 | — | W 11 | W 10 | NW 12 | W 9 | SW 12 | SW 12 | — | — | SW 11 | NW 13 |
| kJ | 6 | 9 | 21 | 40 | 20 | 20 | 19 | 7 | 7 | 7 | — | 2 | 2 | 5 | 2 | 6 | 5 | — | — | 5 | 7 |
Wind waves Height (m) Direction Period (s) | — | NW 10 | — | — | — | — | — | — | — | — | SSW 8 | SW 8 | — | SSW 6 | SSW 6 | — | — | — | — | — | — |
| kJ | — | 517 | — | — | — | — | — | — | — | — | 650 | 269 | — | 21 | 29 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 100 | 0 | 104 | 100 | 0 | 2 | 10 | 0 | 106 | 106 | 114 | 10 | 56 | 2 | 104 | 179 | 104 | 0 | 104 | 2 |
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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