Surf Forecasts:
Viana do Castelo surf forecast from 13 Aug 2026:
- Best quality surf: Saturday 15 Aug, 1PM (local time) - 7ft (2.2m), 7s period, NW swell with cross-offshore winds.
- Most powerful swell: Saturday 15 Aug, 7PM (local time) - 8ft (2.5m), 7s period, NNW swell with 701 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 4AM (local time) - 3.5ft (1.0m), 10s 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 Thursday (Aug 13) at 4AM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.7m and 5s. 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 2.5m 7s and forecast to arrive on Saturday (Aug 15) at 7PM. 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 6s period and expected on Thursday (Aug 13) at 10PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Thu 13th Aug) | 3.5ft (1.0m) 10s |
| Best Surf | 1PM (Sat 15th Aug) | 7ft (2.2m) 7s |
| Most Powerful | 7PM (Sat 15th Aug) | 8ft (2.5m) 7s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on offer for the next couple of weeks at Viana do Castelo.
Right off the bat, the first few days are pretty rough. Wednesday the 12th and Thursday the 13th have some small 4ft swell from the west, but the wind is all over the place, cross and cross-on, making conditions messy. The wave energy is moderate (243 and 267), but it just doesn't line up. Friday morning the 14th cleans up a bit with light cross-offshore winds, but the swell drops to 3ft and the energy is weak (116). It's rideable, but nothing to write home about.
Saturday the 15th sees a jump in size to 7ft then 8ft from the northwest, and the energy gets strong (453 and 578), but the wind is cranking at 19 to 22 mph. That's a no-go for a paddle board; that setup is more interesting for kite surfing than paddle surfing.
The real standout, the one you’ve been waiting for, is Sunday morning the 16th. The swell is a solid 5ft from the NNW, with a light cross-offshore breeze from the north at 6 mph. The conditions are clean, and the wave energy is strong (296). This is the best session on offer. The water temp is 68°F, which is about normal for this time of year, so no surprises there.
Monday morning the 17th is still worth a look with 4ft and clean winds, but the energy drops off (190). Then we get a bit of a lull with small surf and a glassy morning on Tuesday the 18th, but the swell is only 3ft with weak energy (89). The pattern continues with small, ordinary waves until Thursday the 20th, where the swell builds again to 6ft, but the wind gets up to 16 mph, so it's marginal.
Friday the 21st morning is another promising window. We’ve got 5ft from the NNW, light north winds at 6 mph, and strong energy (310). It’s clean and should be a good session, but it's getting further out so keep an eye on it.
After that, the second week looks pretty uninspiring with a lot of small, wind-affected surf. There's a slight chance on Tuesday the 26th morning with 4ft and glassy conditions from the south-southwest, but it's small and the period is short (7 seconds). The rest of the period fades out with tiny, poor waves.
So, to sum it up: Sunday the 16th morning is your best bet, with Friday the 21st morning as a solid backup. The rest is mostly a waiting game.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Sat morning, min 18°C on Wed night). Winds increasing (calm on Wed night, fresh winds from the NNW by Fri afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 31°C on Mon afternoon, min 18°C on Sat night). Winds decreasing (strong winds from the NNW on Sat afternoon, calm by Tue morning). | |||||||||||||||||||
Wed 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 10 | W 10 | W 10 | WNW 10 | WNW 9 | WNW 9 | NW 6 | NNW 6 | NW 8 | NNW 7 | NNW 8 | NNW 7 | NNW 7 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 221 | 183 | 250 | 209 | 153 | 116 | 197 | 245 | 453 | 578 | 551 | 272 | 419 | 439 | 179 | 119 | 238 | 73 | 52 | 134 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | 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 | off | glassy | cross | cross-off |
High Tide | 4:10AM3.39m | 4:25PM3.65m | 4:51AM3.42m | 5:05PM3.63m | 5:30AM3.39m | 5:43PM3.54m | 6:07AM3.29m | 6:19PM3.37m | 6:43AM3.15m | 6:55PM3.16m | 7:20AM2.98m | 7:33PM2.93m | ||||||||
Low Tide | 9:56PM0.44m | 10:08AM0.55m | 10:37PM0.39m | 10:48AM0.53m | 11:16PM0.42m | 11:26AM0.60m | 11:52PM0.52m | 12:03PM0.72m | 00:28AM0.68m | 12:40PM0.89m | 1:03AM0.88m | 1:18PM1.08m | 1:40AM1.10m | |||||||
 |  | | | | | | | | | | | | | | | | | | | |
 | — | — | 6:41 | — | — | 6:41 | — | — | 6:43 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — |
 | 8:39 | — | — | 8:37 | — | — | 8:37 | — | — | 8:36 | — | — | 8:34 | — | — | 8:32 | — | — | 8:30 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 19 | 23 | 23 | 20 | 24 | 24 | 21 | 25 | 26 | 21 | 28 | 27 | 23 | 29 | 31 | 28 | 31 | 30 | 28 |
Feels °C | 24 | 19 | 24 | 22 | 20 | 23 | 21 | 17 | 21 | 21 | 18 | 26 | 24 | 20 | 27 | 28 | 25 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | W 10 | W 10 | W 10 | WNW 10 | WNW 9 | WNW 9 | — | WNW 8 | — | — | S 18 | SW 18 | SW 17 | SW 18 | NNW 8 | W 9 | NNW 8 | NNW 8 | W 8 | NNW 7 |
| kJ | 221 | 183 | 250 | 209 | 153 | 116 | — | 78 | — | — | 7 | 12 | 12 | 12 | 179 | 6 | 238 | 73 | 5 | 134 |
Swell 2 Height (m) Direction Period (s) | NW 9 | NW 5 | NW 5 | N 8 | — | — | — | — | — | — | — | SW 17 | — | — | W 8 | SW 17 | W 8 | W 8 | SW 16 | W 9 |
| kJ | 22 | 19 | 10 | 1 | — | — | — | — | — | — | — | 12 | — | — | 1 | 12 | 6 | 5 | 10 | 6 |
Swell 3 Height (m) Direction Period (s) | — | NNW 9 | NNW 8 | — | — | — | — | — | — | — | — | — | — | — | SW 16 | — | SW 17 | SW 17 | — | SSW 16 |
| kJ | — | 8 | 7 | — | — | — | — | — | — | — | — | — | — | — | 10 | — | 11 | 11 | — | 24 |
Wind waves Height (m) Direction Period (s) | NW 4 | — | — | NW 4 | NNW 6 | NW 6 | NW 6 | NNW 6 | NW 8 | NNW 7 | NNW 8 | NNW 7 | NNW 7 | NNW 8 | — | NNW 8 | — | — | NNW 8 | — |
| kJ | 4 | — | — | 16 | 107 | 68 | 197 | 245 | 453 | 578 | 551 | 272 | 419 | 439 | — | 119 | — | — | 52 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 100 | 0 | 55 | 205 | 0 | 0 | 312 | 19 | 312 | 284 | 18 | 0 | 284 | 18 | 0 | 258 | 0 | 0 | 779 | 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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