Surf Forecasts:
Viana do Castelo surf forecast from 12 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 1AM (local time) - 7ft (2.1m), 7s period, NNW swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 10PM (local time) - 7ft (2.1m), 14s period, NW swell with 1,527 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 10AM (local time) - 2ft (0.6m), 10s 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 Saturday (Sep 12) at 10AM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.7m and 7s. 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 2.1m 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 0.4m 5s period and expected on Sunday (Sep 13) at 10PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Sat 12th Sep) | 2ft (0.6m) 10s |
| Best Surf | 1AM (Wed 16th Sep) | 7ft (2.1m) 7s |
| Most Powerful | 10PM (Fri 18th Sep) | 7ft (2.1m) 14s |
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 the next couple of weeks are serving up for our stretch of coast.
The opening days are pretty quiet, to be honest. We’ve got a small pulse of swell on the way, but it’s nothing to write home about. The first real highlight doesn’t show up until Sunday the 13th. The water temp is pretty standard for this time of year, so no dramas there.
Viana do Castelo (Vianado-Castelo) is the spot to keep an eye on for that first standout. Early Sunday morning, we’re looking at a clean 4.3ft of NW groundswell at 12 seconds. Wind is glassy from the ENE, so it’s going to be smooth and lined up. The swell energy is moderate at 533, and it’s got that long-period push that this river break loves. That’s your pick for the early part of the forecast – proper clean conditions and a decent wave. There are a few other options through the following days, but nothing that really tops that Sunday morning session. Tuesday the 15th has a bit of wind, but Wednesday the 16th afternoon sees a bigger 6.9ft NW swell, although it looks too strong for this break – that’s heading into expert-only territory, and even then, it might be messy.
Looking further out, there’s a solid window around Monday the 21st. The morning is looking like the real deal. We’ve got a 5.6ft NW groundswell with a very long 14-second period and a glassy easterly wind. That’s a powerful, clean combo. The wave energy jumps right up to 1373, which is strong. This is another standout, but with that size and power, it’s strictly for experienced surfers. The river mouth should handle the long-period energy well. The following Tuesday the 22nd also has some fun, clean chest-to-head-high waves, but the Monday morning is the one to circle.
After that, the swell backs off and things get a bit more ordinary. There’s some small, clean surf around Friday the 25th, but it’s not doing much. The last day of the forecast, Sunday the 27th, fades right out with weak energy and small waves. All in all, we’ve got two proper windows of opportunity: early Sunday and then again on Monday the 21st. Don’t sleep on the first one, as it’s the most user-friendly. The second is for the bigger-wave crew.
Keep it salty.
Short Range ForecastMostly dry. Warm (max 31°C on Sun morning, min 22°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Wed afternoon, min 13°C on Wed night). Winds increasing (calm on Mon night, fresh winds from the NNW by Tue afternoon). | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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) | WNW 10 | WNW 9 | NW 14 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 10 | NW 12 | NW 5 | NNW 7 | NNW 8 | NNW 7 | NNW 8 | NW 10 | NW 10 | NNW 9 | NNW 9 | NW 14 | NW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 74 | 90 | 181 | 520 | 533 | 326 | 165 | 134 | 77 | 40 | 123 | 396 | 447 | 455 | 653 | 768 | 507 | 553 | 264 | 780 | 1306 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross-off | glassy | cross | off | glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 4:25AM3.46m | 4:37PM3.56m | 4:58AM3.43m | 5:10PM3.47m | 5:30AM3.34m | 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 | |||||||
Low Tide | 10:23AM0.53m | 10:44PM0.45m | 10:56AM0.58m | 11:16PM0.55m | 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 | |||||||
 | |  | | | | | | | | | | |  | | | | | | | | |
 | 7:11 | — | — | 7:11 | — | — | 7:13 | — | — | 7:13 | — | — | 7:15 | — | — | 7:16 | — | — | 7:16 | — | — |
 | — | 7:51 | — | — | 7:49 | — | — | 7:46 | — | — | 7:45 | — | — | 7:44 | — | — | 7:42 | — | — | 7:39 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 29 | 27 | 31 | 30 | 27 | 29 | 27 | 22 | 23 | 23 | 19 | 23 | 25 | 18 | 22 | 25 | 18 | 23 | 24 | 20 |
Feels °C | 26 | 27 | 26 | 29 | 28 | 25 | 27 | 26 | 22 | 20 | 18 | 15 | 17 | 18 | 13 | 19 | 20 | 13 | 20 | 20 | 17 |
Swell 1 Height (m) Direction Period (s) | NW 7 | WNW 9 | NW 10 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 10 | NW 9 | WNW 8 | WNW 10 | WNW 10 | WNW 10 | NW 11 | NW 10 | NW 10 | NNW 9 | NNW 9 | NW 14 | NW 13 |
| kJ | 53 | 90 | 130 | 520 | 533 | 326 | 165 | 134 | 77 | 40 | 13 | 133 | 116 | 78 | 347 | 768 | 507 | 553 | 264 | 780 | 1306 |
Swell 2 Height (m) Direction Period (s) | WNW 10 | NNW 7 | NW 14 | W 9 | SW 12 | W 10 | WNW 9 | WNW 9 | WNW 8 | W 8 | — | — | — | WNW 13 | S 13 | — | S 18 | S 16 | NW 14 | SW 16 | SW 14 |
| kJ | 74 | 35 | 181 | 7 | 6 | 49 | 65 | 62 | 57 | 34 | — | — | — | 106 | 3 | — | 6 | 5 | 198 | 10 | 8 |
Swell 3 Height (m) Direction Period (s) | SW 13 | NW 9 | W 8 | SW 12 | — | S 12 | — | — | NW 13 | NW 12 | — | — | — | — | — | — | — | S 12 | SW 16 | — | — |
| kJ | 7 | 13 | 37 | 6 | — | 3 | — | — | 7 | 34 | — | — | — | — | — | — | — | 3 | 10 | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NW 3 | NW 5 | NNW 7 | NNW 8 | NNW 7 | NNW 8 | — | — | — | — | NNW 9 | — |
| kJ | — | — | — | — | — | — | — | — | — | 2 | 123 | 396 | 447 | 455 | 653 | — | — | — | — | 207 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 14 | 0 | 0 | 104 | 0 | 0 | 768 | 120 | 312 | 120 | 120 | 0 | 100 | 19 | 0 | 100 | 2 |
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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