Surf Forecasts:
Viana do Castelo surf forecast from 6 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 1AM (local time) - 3ft (0.9m), 10s period, W swell with cross-offshore winds.
- Most powerful swell: Wednesday 12 Aug, 1PM (local time) - 3.5ft (1.1m), 9s period, W swell with 194 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 10PM (local time) - 2.5ft (0.8m), 8s period with NNW 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 06) at 10PM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.6m and 4s is also forecast. 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 1.1m 9s and forecast to arrive on Wednesday (Aug 12) at 1PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Thursday (Aug 13) at 10PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Thu 6th Aug) | 2.5ft (0.8m) 8s |
| Best Surf | 1AM (Wed 12th Aug) | 3ft (0.9m) 10s |
| Most Powerful | 1PM (Wed 12th Aug) | 3.5ft (1.1m) 9s |
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 cookin’ for the next couple of weeks.
Right off the bat, it’s a slow start. The first few days are a bit of a write-off, with tiny, weak swell and poor conditions. You’re looking at a real gap in the action until we get to the middle of next week. So, have a cup of coffee, wax up your boards, and be patient.
The first real glimmer of hope pops up on Wednesday, 12 August, in the morning. It’s not a world-beater, but it’s the first time we’ve got something decent. Viana do Castelo should see a 3ft swell pushing in from the west with a period of 9 seconds. The combined energy hits moderate levels (214), and with light, offshore winds from the NW, it’s going to be clean. The water temp is sitting at 65°, which is about 1° cooler than normal for this time of year—nothing too wild, just a bit fresh.
The true standout, the one you’ll want to circle on the calendar, is Thursday morning, 13 August. This is the best on offer. The swell ticks up just a touch to 4ft, still straight out of the west, with a period of 10 seconds. That’s a nice, long groundswell. The energy is strong (243), and the wind is a complete glass-off. The river mouth there (Viana do Castelo) should be handling it beautifully. The longer period means better shaped waves and more energy in the water, but remember, that kind of swell can be a bit too straight for the beach breaks—but here, it’s a river mouth, so it should stack up nicely. It’s a beginner-friendly size, though at 4ft, it’s still very manageable. Just be aware that crowds are often a thing here, so get there early.
After that, we’ve got a scattering of smaller, cleaner mornings on the 15th, 16th, and 17th. The Monday morning, 17 August is worth a mention, with a 3ft swell from the WNW and a 9-second period, but the combined energy is strong (228) and the wind is clean cross-off from the north. However, the forecast for that one is a bit more marginal—it’s a week and a half out, so take it with a grain of salt. The long-range stuff into the 20th and 21st falls away again to tiny, choppy junk.
So, if you’ve got a window, make it Thursday the 13th. That’s your best shot.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Fri afternoon, min 18°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Sun afternoon, min 17°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Thu 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | ||||||||||||||
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) | NNW 8 | NNW 8 | NNW 8 | W 9 | NW 7 | W 9 | W 7 | NW 11 | NNW 10 | NNW 10 | W 7 | NW 8 | NW 7 | NW 5 | NW 8 | NW 8 | W 10 | W 9 | W 9 | W 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 86 | 86 | 56 | 26 | 14 | 14 | 27 | 58 | 65 | 63 | 64 | 53 | 60 | 42 | 58 | 64 | 151 | 160 | 159 | 159 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | glassy | cross | glassy | glassy | cross-on | glassy | cross-on | cross-on | cross-off | cross-off | cross | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 9:28PM2.82m | 10:14AM2.85m | 10:51PM2.72m | 11:39AM2.88m | 00:21AM2.76m | 12:59PM3.03m | 1:36AM2.92m | 2:03PM3.24m | 2:36AM3.11m | 2:56PM3.43m | 3:26AM3.28m | 3:43PM3.58m | ||||||||
Low Tide | 3:46AM1.14m | 4:37PM1.24m | 5:10AM1.19m | 6:07PM1.17m | 6:33AM1.11m | 7:22PM0.98m | 7:41AM0.95m | 8:22PM0.76m | 8:37AM0.77m | 9:12PM0.57m | 9:25AM0.63m | 9:56PM0.44m | ||||||||
 |  | | | | | | |  | | | | | | | | | | | | |
 | — | — | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — | 6:39 | — | — |
 | 8:47 | — | — | 8:45 | — | — | 8:45 | — | — | 8:44 | — | — | 8:42 | — | — | 8:40 | — | — | 8:39 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 19 | 22 | 23 | 19 | 23 | 23 | 20 | 23 | 23 | 19 | 22 | 22 | 18 | 22 | 22 | 18 | 23 | 23 | 20 |
Feels °C | 20 | 19 | 22 | 23 | 20 | 23 | 24 | 23 | 24 | 23 | 19 | 21 | 20 | 18 | 22 | 21 | 17 | 22 | 21 | 19 |
Swell 1 Height (m) Direction Period (s) | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NW 7 | W 6 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 6 | NW 5 | NW 8 | W 11 | W 10 | W 9 | W 9 | W 9 |
| kJ | 86 | 86 | 56 | 23 | 14 | 6 | 27 | 44 | 47 | 62 | 62 | 32 | 19 | 42 | 58 | 62 | 151 | 160 | 159 | 159 |
Swell 2 Height (m) Direction Period (s) | W 10 | W 9 | W 9 | W 9 | W 6 | W 9 | NNW 12 | NW 11 | NNW 10 | NNW 10 | NW 9 | NW 8 | W 11 | W 6 | WNW 10 | NW 10 | NW 10 | NNW 9 | — | NNW 9 |
| kJ | 47 | 28 | 27 | 26 | 7 | 14 | 15 | 58 | 65 | 63 | 64 | 53 | 9 | 11 | 19 | 28 | 100 | 34 | — | 8 |
Swell 3 Height (m) Direction Period (s) | SW 12 | SW 12 | SW 13 | S 11 | W 9 | NNW 7 | NNW 6 | N 6 | — | S 13 | — | W 11 | N 14 | WNW 10 | W 5 | W 5 | — | — | — | — |
| kJ | 5 | 5 | 7 | 2 | 14 | 4 | 4 | 1 | — | 3 | — | 2 | 4 | 10 | 5 | 2 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | NW 7 | NW 4 | — | NW 8 | — | — | NW 9 | NNW 5 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 60 | 20 | — | 64 | — | — | 67 | 28 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 106 | 0 | 0 | 588 | 19 | 104 | 104 | 0 | 104 | 114 | 0 | 0 | 146 | 0 | 251 | 100 | 0 | 0 | 100 | 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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