Surf Forecasts:
Viana do Castelo surf forecast from 10 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 10AM (local time) - 3.5ft (1.0m), 10s period, W swell with glassy winds.
- Most powerful swell: Friday 14 Aug, 10PM (local time) - 6.5ft (2.0m), 8s period, NW swell with 441 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 1AM (local time) - 3ft (0.9m), 9s 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 Tuesday (Aug 11) at 1AM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.3m and 6s. 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 8s and forecast to arrive on Friday (Aug 14) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Thursday (Aug 13) at 7PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 11th Aug) | 3ft (0.9m) 9s |
| Best Surf | 10AM (Wed 12th Aug) | 3.5ft (1.0m) 10s |
| Most Powerful | 10PM (Fri 14th Aug) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it for the Viana do Castelo stretch. We’re looking at a pretty quiet start to the forecast period, with a gap of a few days where the surf just isn’t worth dropping everything for. The water temp is sitting at 68°, which is 1° warmer than usual for this time of year – pretty much average, nothing to write home about.
The first real glimmer of hope comes early on Tuesday morning, August 11th. The swell is small, around 2ft from the NW with a period of 8 seconds, but the wind is glassy. That’s the big one here – a total mirror finish. The combined energy is moderate (130). It’s not going to be pumping, but it’ll be clean and fun for a beginner on a longboard.
Skip the afternoons, they get messy with a cross-shore breeze. The next standout is a proper little window on Saturday morning, August 15th. The swell picks up a touch to 4ft from the NW, and again, we get glassy conditions. The energy is nudging up (218), and the forecast says “good surf conditions.” That’s the pick of the first week – small but perfect.
The best on offer, though, is further out. On Friday, August 21st, the morning looks sweet. We’ve got a 5ft NW swell with glassy conditions and a solid energy reading of 288. That’s a quality window. The following morning, Saturday 22nd, the swell size drops right off, but Tuesday, August 25th, brings a real change. The morning has a 6ft swell from the NNW, with offshore wind, and the energy jumps to 574. That’s a strong, powerful swell, but for a river break, that size is only for the experienced crew. The afternoon that same day pushes 7ft, which is too big for this spot, and the wind swings cross-shore, making it messy.
The river mouth at Viana do Castelo is the spot to watch for that Tuesday morning, August 25th. It’s an exposed break, fairly consistent, and the swell direction from the NNW is a good match for the optimum W swell. The offshore wind is a major plus. Crowds are often there, so expect company. This is the standout period – a promising, powerful window that’s a long way out, so keep an eye on the forecasts.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Mon morning, min 17°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Fri morning, min 18°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
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 8 | NW 7 | NW 9 | NW 8 | NW 10 | W 10 | W 10 | W 10 | W 10 | W 10 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | NW 8 | NW 8 | NW 8 | NNW 8 | NNW 6 | NNW 8 | NNW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 60 | 73 | 132 | 47 | 163 | 94 | 183 | 179 | 183 | 260 | 209 | 153 | 116 | 111 | 427 | 255 | 232 | 344 | 60 | 126 | 147 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross | cross | glassy | glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross | cross-off | cross-on | cross | cross-off |
High Tide | 2:03PM3.24m | 2:36AM3.11m | 2:56PM3.43m | 3:26AM3.28m | 3:43PM3.58m | 4:10AM3.39m | 4:25PM3.65m | 4:51AM3.42m | 5:05PM3.63m | 5:30AM3.39m | 5:43PM3.54m | 6:07AM3.29m | 6:19PM3.37m | ||||||||
Low Tide | 8:22PM0.76m | 8:37AM0.77m | 9:12PM0.57m | 9:25AM0.63m | 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 | ||||||||
 | |  | | | | | | | | | | | | | | | |  | |  | |
 | 6:37 | — | — | 6:39 | — | — | 6:39 | — | — | 6:41 | — | — | 6:41 | — | — | 6:43 | — | — | 6:43 | — | — |
 | — | 8:42 | — | — | 8:40 | — | — | 8:39 | — | — | 8:37 | — | — | 8:37 | — | — | 8:36 | — | — | 8:34 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 23 | 22 | 19 | 23 | 22 | 18 | 23 | 22 | 19 | 24 | 24 | 21 | 25 | 24 | 21 | 25 | 25 | 21 | 24 | 24 | 21 |
Feels °C | 22 | 20 | 19 | 23 | 21 | 18 | 24 | 22 | 19 | 23 | 23 | 19 | 24 | 22 | 19 | 26 | 24 | 21 | 25 | 23 | 21 |
Swell 1 Height (m) Direction Period (s) | NW 8 | WSW 6 | NW 9 | NW 8 | WNW 11 | NW 5 | W 10 | W 10 | W 10 | W 10 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | S 12 | NW 8 | W 8 | NNW 8 | NNW 6 | NNW 8 | NNW 8 |
| kJ | 60 | 13 | 132 | 41 | 40 | 57 | 183 | 179 | 183 | 260 | 209 | 153 | 116 | 111 | 3 | 255 | 5 | 344 | 60 | 126 | 147 |
Swell 2 Height (m) Direction Period (s) | W 7 | W 11 | WSW 6 | NNW 11 | WNW 9 | W 10 | NW 5 | NNW 9 | NW 6 | NNW 8 | — | — | — | — | S 12 | W 8 | — | W 8 | NNW 9 | W 8 | W 8 |
| kJ | 31 | 9 | 7 | 47 | 8 | 94 | 13 | 17 | 59 | 7 | — | — | — | — | 3 | 12 | — | 1 | 52 | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | W 11 | NW 14 | WNW 10 | NW 4 | — | NNW 9 | NNW 9 | — | NNW 9 | — | — | — | — | — | — | — | — | — | W 8 | SW 17 | SW 18 |
| kJ | 2 | 8 | 20 | 5 | — | 33 | 32 | — | 8 | — | — | — | — | — | — | — | — | — | 1 | 12 | 12 |
Wind waves Height (m) Direction Period (s) | — | NW 7 | — | — | NW 10 | — | — | NW 5 | — | NW 5 | NNW 5 | NNW 6 | NNW 6 | NNW 6 | NW 8 | — | NW 8 | — | — | — | — |
| kJ | — | 73 | — | — | 163 | — | — | 10 | — | 23 | 42 | 123 | 57 | 65 | 427 | — | 232 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 182 | 0 | 2 | 100 | 0 | 0 | 100 | 0 | 0 | 151 | 5 | 0 | 284 | 0 | 0 | 284 | 0 | 14 | 305 | 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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