Surf Forecasts:
Viana do Castelo surf forecast from 14 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 10PM (local time) - 7.5ft (2.3m), 7s period, NNW swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 10PM (local time) - 10ft (3.0m), 14s period, NW swell with 3,067 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 10PM (local time) - 2ft (0.6m), 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 Monday (Sep 14) at 10PM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.6m and 9s. 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 3.0m 14s and forecast to arrive on Friday (Sep 18) 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 1.3m 6s period and expected on Friday (Sep 18) at 4AM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Mon 14th Sep) | 2ft (0.6m) 10s |
| Best Surf | 10PM (Tue 15th Sep) | 7.5ft (2.3m) 7s |
| Most Powerful | 10PM (Fri 18th Sep) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’ve been looking over the charts for the next couple of weeks.
We’ve got a long run ahead, but it starts off a bit slow. The first real session to get excited about is Monday the 16th of September, but things will pick up from there. The water temp at Viana do Castelo is sitting around 64°, which is about average for this time of year, so no need to dig out the thick rubber just yet.
Right, the standout is Thursday morning, the 19th of September. The river mouth at Viana do Castelo will be pumping with a clean 7 ft NW swell (moderate to strong combined energy in the 1300s). The offshore wind from the NE will keep the faces absolutely clean. This one’s for experienced surfers only at that size. This will be the best wave of the run, but you’ll want to be out early before the wind switches.
Tuesday the 17th is also a good shout. The morning shows a solid 6 ft NW swell with a gentle offshore NNE wind, making for very clean conditions. The combined wave energy is strong (739). It’s a bit more manageable size-wise than the Thursday standout.
Wednesday the 18th morning is solid too, with 5 ft groundswell from the NW and light offshore winds. The crowd situation at Viana do Castelo can be a bit of a lottery—it’s often busy, so be prepared for company on the good days.
There’s a gap coming. After Monday the 23rd, the swell dies right off, and there’s nothing worth paddling out for until Thursday the 26th, and even then it’s only small. Then we get a pulse on Friday the 27th morning, with a clean 5 ft groundswell from the WNW and glassy conditions. That’s a promising one but it’s far out, so keep an eye on it.
Lower down the list, there’s plenty of days where the swell is either too small or the wind has it chopped. For instance, the afternoon of the 16th and 18th have solid sized NW swell but with too much NW wind on it, turning the surface ugly. Keep your expectations realistic on those afternoons.
So, in short: get on the Thursday 19th morning for the best session if you’ve got the skill, or the Tuesday 17th morning for a slightly gentler but still clean day. The Friday 27th morning in the second week looks good but don’t hold me to it too far out.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Mon morning, min 14°C on Wed night). Winds increasing (calm on Mon night, fresh winds from the NNW by Tue afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Sat morning, min 14°C on Thu night). Winds decreasing (fresh winds from the NNW on Thu afternoon, light winds from the NE by Sat morning). | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 11 | NW 11 | NW 10 | WNW 8 | NW 6 | NW 8 | NNW 8 | NW 8 | NW 11 | NW 10 | NW 10 | NW 9 | NW 9 | NW 14 | NW 14 | NW 13 | NW 12 | NW 12 | NW 11 | NW 10 | NW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 165 | 137 | 77 | 59 | 190 | 585 | 410 | 711 | 1313 | 739 | 815 | 172 | 437 | 2103 | 2570 | 1306 | 899 | 711 | 457 | 344 | 476 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | off | off | cross-off | cross-off | cross-off | cross | off |
High Tide | 5:42PM3.31m | 6:01AM3.21m | 6:15PM3.11m | 6:33AM3.04m | 6:49PM2.89m | 7:09AM2.85m | 7:28PM2.65m | 7:51AM2.67m | 8:22PM2.44m | 8:54AM2.51m | 9:48PM2.29m | 10:30AM2.45m | 11:38PM2.32m | ||||||||
Low Tide | 11:29AM0.69m | 11:46PM0.70m | 12:02PM0.84m | 00:17AM0.90m | 12:36PM1.03m | 00:49AM1.11m | 1:14PM1.23m | 1:27AM1.33m | 2:04PM1.43m | 2:19AM1.54m | 3:24PM1.58m | 3:50AM1.68m | 5:18PM1.57m | ||||||||
 | |  | | | | | | | | | | | | | | | | | | | |
 | 7:13 | — | — | 7:13 | — | — | 7:15 | — | — | 7:16 | — | — | 7:16 | — | — | 7:18 | — | — | 7:20 | — | — |
 | — | 7:46 | — | — | 7:45 | — | — | 7:44 | — | — | 7:42 | — | — | 7:39 | — | — | 7:37 | — | — | 7:37 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 27 | 22 | 24 | 23 | 19 | 23 | 24 | 18 | 21 | 23 | 18 | 24 | 26 | 22 | 28 | 28 | 26 | 31 | 29 | 28 |
Feels °C | 27 | 26 | 23 | 21 | 19 | 15 | 17 | 17 | 12 | 17 | 17 | 13 | 21 | 21 | 18 | 25 | 24 | 23 | 29 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | NW 11 | NW 11 | NW 10 | WNW 8 | — | — | WNW 10 | WNW 10 | S 13 | NW 10 | — | NW 9 | NW 9 | NW 14 | NW 14 | NW 13 | NW 12 | NW 12 | NW 11 | NW 10 | NW 10 |
| kJ | 165 | 137 | 77 | 59 | — | — | 116 | 78 | 3 | 739 | — | 159 | 437 | 2103 | 2570 | 1306 | 899 | 711 | 457 | 344 | 246 |
Swell 2 Height (m) Direction Period (s) | WNW 9 | WNW 9 | WNW 8 | NW 9 | — | — | NW 14 | — | — | — | — | S 16 | NW 15 | SW 16 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | NW 17 | NW 14 |
| kJ | 64 | 65 | 57 | 40 | — | — | 7 | — | — | — | — | 5 | 134 | 10 | 8 | 8 | 8 | 7 | 7 | 46 | 476 |
Swell 3 Height (m) Direction Period (s) | — | S 11 | NW 13 | NW 12 | — | — | — | — | — | — | — | — | SW 16 | — | — | — | — | — | W 19 | SW 13 | SW 13 |
| kJ | — | 2 | 7 | 34 | — | — | — | — | — | — | — | — | 10 | — | — | — | — | — | 7 | 7 | 6 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NW 6 | NW 8 | NNW 8 | NW 8 | NW 11 | — | NW 10 | NNW 6 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 190 | 585 | 410 | 711 | 1313 | — | 815 | 172 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 104 | 0 | 0 | 809 | 438 | 330 | 438 | 130 | 0 | 205 | 120 | 0 | 251 | 2 | 0 | 130 | 0 | 0 | 151 | 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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