Surf Forecasts:
Viana do Castelo surf forecast from 6 Sep 2026:
- Best quality surf: Monday 7 Sep, 1AM (local time) - 4.5ft (1.4m), 14s period, WNW swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 7AM (local time) - 6ft (1.9m), 13s period, WNW swell with 1,121 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 1AM (local time) - 4.5ft (1.4m), 14s period with WNW 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 07) at 1AM. The primary swell is predicted to be 1.4m and 14s period with a secondary swell of 0.8m and 10s. 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 1.9m 13s and forecast to arrive on Monday (Sep 07) at 7AM. 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 6s period and expected on Friday (Sep 11) at 4AM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Mon 7th Sep) | 4.5ft (1.4m) 14s |
| Best Surf | 1AM (Mon 7th Sep) | 4.5ft (1.4m) 14s |
| Most Powerful | 7AM (Mon 7th Sep) | 6ft (1.9m) 13s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright folks, let's have a look at the surf for Viana do Castelo (Portugal) over the next couple of weeks. It's a slow start, but there's some real firepower on the horizon if you're willing to wait.
The first real session to get excited about is on Monday the 7th of September. Monday morning is the pick. Viana do Castelo will have a clean, cross-off breeze out of the NNW at 9 mph. The swell is building to a solid 6 ft from the WNW, with a nice 12-second period. That's proper groundswell energy, and you'll feel it. The combined energy is strong at 1101. This is excellent surf, but at that size and with that power, it's for experienced surfers only. Beginners, stay on the beach. The water temp is 66°F, which is pretty much what you'd expect for the time of year.
The next week is a bit of a mixed bag with some small, clean days. Then, lock in Sunday the 13th of September. That morning is looking like a dream. The wind is dead calm – glassy, flat water – and the swell is a consistent 5 ft from the NW with a 12-second period. The energy is still strong at 647. It's going to be beautiful and clean on that river mouth.
After another quiet stretch, we've got a promising long-range call. Friday the 18th of September morning is shaping up to be another standout. You'll have a clean offshore breeze from the NE at 6 mph, with a solid 6 ft swell from the NW, period at 11 seconds. The combined energy is strong at 735. It's promising, but it's a way off, so keep checking the charts.
The next morning, Saturday the 19th of September, is also one to mark. Glassy conditions with an easterly breeze, and a 6 ft NW swell. It's going to be clean and have some punch.
So, the first half of the outlook is mostly small and ordinary, but there are some absolute crackers if you pick your days. The river mouth at Viana do Castelo will handle those longer period groundswells well, keeping things tidy and lined up.
Rusty.
Short Range ForecastSome drizzle, heaviest during Tue afternoon. Warm (max 23°C on Sun morning, min 15°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Fri afternoon, min 15°C on Wed night). Winds decreasing (fresh winds from the NNW on Wed afternoon, light winds from the NE by Fri night). | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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 10 | WNW 14 | WNW 12 | WNW 12 | WNW 11 | WNW 10 | NW 9 | NW 8 | NW 8 | NW 8 | NNW 7 | NNW 10 | NNW 10 | NNW 6 | NW 9 | NW 8 | NW 6 | WNW 9 | NW 9 | WNW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 332 | 212 | 811 | 1002 | 718 | 597 | 305 | 79 | 327 | 306 | 306 | 282 | 445 | 356 | 150 | 64 | 43 | 85 | 49 | 95 | 204 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | glassy | cross-off | off |
High Tide | 11:36AM2.81m | 00:27AM2.70m | 12:57PM2.98m | 1:37AM2.92m | 1:56PM3.21m | 2:29AM3.14m | 2:44PM3.40m | 3:11AM3.31m | 3:25PM3.54m | 3:49AM3.42m | 4:02PM3.59m | 4:25AM3.46m | 4:37PM3.56m | ||||||||
Low Tide | 6:10PM1.20m | 6:35AM1.21m | 7:21PM0.98m | 7:39AM1.00m | 8:14PM0.75m | 8:28AM0.80m | 8:57PM0.56m | 9:10AM0.64m | 9:36PM0.45m | 9:48AM0.55m | 10:11PM0.41m | 10:23AM0.53m | 10:44PM0.45m | ||||||||
 | |  | | | |  |  | | | |  | | | | | | | | | | |
 | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:09 | — | — | 7:11 | — | — |
 | — | 8:00 | — | — | 7:59 | — | — | 7:57 | — | — | 7:55 | — | — | 7:53 | — | — | 7:52 | — | — | 7:51 | — |
mm | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 22 | 19 | 23 | 22 | 18 | 21 | 20 | 18 | 21 | 22 | 17 | 22 | 23 | 20 | 27 | 29 | 27 | 32 | 30 | 28 |
Feels °C | 22 | 20 | 17 | 21 | 20 | 17 | 20 | 20 | 17 | 17 | 17 | 13 | 18 | 17 | 17 | 24 | 25 | 25 | 30 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | NW 11 | NW 10 | WNW 14 | WNW 12 | WNW 12 | WNW 11 | WNW 10 | NW 9 | — | NW 8 | NW 11 | NNW 11 | NNW 10 | W 7 | NNW 10 | NNW 6 | NW 8 | NW 6 | WNW 9 | NW 9 | WNW 10 |
| kJ | 332 | 212 | 811 | 1002 | 718 | 597 | 305 | 76 | — | 306 | 163 | 207 | 445 | 10 | 54 | 40 | 43 | 85 | 49 | 95 | 204 |
Swell 2 Height (m) Direction Period (s) | WNW 9 | W 18 | NW 10 | NNW 9 | — | NNW 8 | — | W 9 | — | NW 11 | — | NW 10 | W 8 | W 11 | W 7 | NW 9 | W 7 | W 8 | NNW 6 | WNW 11 | NW 14 |
| kJ | 84 | 156 | 110 | 31 | — | 7 | — | 79 | — | 64 | — | 16 | 11 | 2 | 9 | 64 | 4 | 4 | 12 | 49 | 153 |
Swell 3 Height (m) Direction Period (s) | SW 12 | SW 12 | WNW 9 | — | — | — | — | — | — | — | — | W 12 | W 11 | — | W 10 | W 7 | W 8 | — | NW 8 | NW 16 | S 12 |
| kJ | 6 | 5 | 90 | — | — | — | — | — | — | — | — | 3 | 2 | — | 8 | 8 | 1 | — | 9 | 10 | 3 |
Wind waves Height (m) Direction Period (s) | — | WNW 9 | — | NNW 9 | NW 9 | — | — | — | NW 8 | — | NW 8 | NNW 7 | NNW 7 | NNW 10 | NNW 6 | — | NW 6 | — | — | NNW 6 | — |
| kJ | — | 116 | — | 68 | 79 | — | — | — | 327 | — | 306 | 282 | 120 | 356 | 150 | — | 31 | — | — | 24 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 182 | 0 | 0 | 299 | 0 | 0 | 100 | 19 | 5 | 251 | 5 | 2 | 210 | 19 | 0 | 251 | 0 | 0 | 116 | 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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