Surf Forecasts:
Viana do Castelo surf forecast from 10 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 7PM (local time) - 7.5ft (2.3m), 8s period, NW swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 4AM (local time) - 6ft (1.9m), 11s period, NW swell with 875 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 1AM (local time) - 2.5ft (0.7m), 9s 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 Friday (Sep 11) at 1AM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.3m and 7s. 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 11s and forecast to arrive on Thursday (Sep 17) at 4AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Thursday (Sep 10) at 10PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Fri 11th Sep) | 2.5ft (0.7m) 9s |
| Best Surf | 7PM (Wed 16th Sep) | 7.5ft (2.3m) 8s |
| Most Powerful | 4AM (Thu 17th Sep) | 6ft (1.9m) 11s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s talk about what’s coming up for Viana do Castelo at the river mouth. We’ve got a 16-day window, and the first few days are pretty quiet, so we’ll have to wait a bit for the juice to show up.
The week starts off slow. There’s a little pulse on Thursday morning, 10th September with chest-high waves around 4ft from the NNW and a decent 10-second period. The combined energy is moderate at 338, and the wind is a light cross-off, keeping it clean. The water is sitting at 63°F, which feels a touch colder than usual for this time of year. Not a standout session, just something to wet the line.
The next couple of days are flat or weak – Friday and Saturday have small, ordinary waves mostly under 3ft. Saturday morning does go glassy, but the swell is tiny. Hold on tight.
Then, Sunday morning, 13th September – this is one of our standout windows. We’re looking at 4ft from the NW with a nice long 12-second period. The combined energy is strong at 532, and it’s glassy. That’s going to be clean, lined-up, and fun on the river mouth. The water is still on the cooler side, but that morning session will be worth getting up for.
The following week is a mixed bag. Monday morning is glassy again but smaller at 3ft with an 11-second period. Midweek picks up a bit – on Wednesday morning, 16th September we get a punchy 7ft from the NNW, but the period drops to 8 seconds, and winds are getting stronger. That’s getting a bit too lumpy and short-period for the river setup. Not our best look.
The real standout for the second week hits on Thursday morning, 17th September. We’ve got solid 6ft from the NW with a long 11-second period and offshore wind from the NE. The combined energy is cranking at 654. This is the best-looking swell of the run – clean, powerful, and lined up. The river mouth should be handling that well.
After that, it tails off into smaller, cleaner mornings but nothing that’ll blow you away. By Friday, 25th September there’s a huge 10ft NNW swell forecasted with a very long 14-second period, but the combined energy is massive at 3999 – that’s way too big for this spot, strictly for experts or kites. The wind is light and cross-onshore, so the power is there, but it’s a dangerous one.
Overall, the best windows are Sunday, 13th morning and Thursday, 17th morning – that’s your clean, quality swell. The rest is either small, wind-affected, or just okay. Keep an eye on the long-range stuff, but it’s promising.
Stay stoked,
Rusty
Short Range ForecastMostly dry. Warm (max 28°C on Sat morning, min 17°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 31°C on Sun morning, min 14°C on Tue night). Winds increasing (calm on Sun morning, fresh winds from the NNW by Tue afternoon). | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 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) | NNW 10 | NNW 10 | NNW 9 | NW 9 | NW 8 | NW 7 | WNW 10 | WNW 9 | NW 14 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 10 | NW 12 | NW 11 | NNW 7 | NNW 8 | NNW 8 | NW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 308 | 241 | 73 | 62 | 169 | 159 | 98 | 90 | 181 | 511 | 533 | 369 | 198 | 134 | 77 | 40 | 515 | 355 | 527 | 412 | 488 |
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 | off | glassy | cross-off | off | glassy | cross | glassy | glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 3:25PM3.54m | 3:49AM3.42m | 4:02PM3.59m | 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 | ||||||||
Low Tide | 9:36PM0.45m | 9:48AM0.55m | 10:11PM0.41m | 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 | ||||||||
 | |  | | | | | | | | | | | | | | | | | | | |
 | 7:09 | — | — | 7:09 | — | — | 7:11 | — | — | 7:11 | — | — | 7:13 | — | — | 7:13 | — | — | 7:15 | — | — |
 | — | 7:53 | — | — | 7:52 | — | — | 7:51 | — | — | 7:49 | — | — | 7:46 | — | — | 7:45 | — | — | 7:44 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 20 | 17 | 24 | 26 | 23 | 28 | 28 | 26 | 31 | 30 | 27 | 28 | 27 | 22 | 23 | 22 | 18 | 22 | 24 | 17 |
Feels °C | 18 | 17 | 14 | 21 | 23 | 22 | 27 | 26 | 24 | 30 | 28 | 26 | 27 | 25 | 22 | 19 | 18 | 14 | 16 | 17 | 12 |
Swell 1 Height (m) Direction Period (s) | NNW 10 | W 7 | NNW 9 | NW 9 | W 7 | NW 7 | NW 7 | WNW 9 | NW 10 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 10 | NW 9 | W 8 | WNW 10 | NW 13 | WNW 10 | NNW 8 |
| kJ | 308 | 17 | 73 | 62 | 4 | 159 | 53 | 90 | 130 | 511 | 533 | 369 | 198 | 134 | 77 | 40 | 11 | 154 | 7 | 114 | 363 |
Swell 2 Height (m) Direction Period (s) | W 8 | W 11 | W 7 | NNW 9 | SW 15 | — | WNW 10 | NW 9 | NW 14 | W 9 | SW 12 | W 10 | WNW 9 | WNW 9 | WNW 8 | W 8 | — | — | — | NW 12 | NW 12 |
| kJ | 20 | 9 | 9 | 16 | 8 | — | 98 | 13 | 181 | 15 | 6 | 48 | 64 | 61 | 54 | 33 | — | — | — | 157 | 488 |
Swell 3 Height (m) Direction Period (s) | W 11 | — | W 10 | W 7 | S 15 | — | SW 13 | NW 16 | W 8 | SW 12 | — | S 12 | — | S 11 | NW 13 | NW 12 | — | — | — | — | S 13 |
| kJ | 10 | — | 7 | 8 | 4 | — | 7 | 41 | 52 | 6 | — | 3 | — | 2 | 7 | 35 | — | — | — | — | 3 |
Wind waves Height (m) Direction Period (s) | — | NNW 10 | NNW 5 | NNW 4 | NW 8 | — | — | NNW 7 | — | — | — | — | — | — | NW 3 | NNW 4 | NW 11 | NNW 7 | NNW 8 | NNW 8 | — |
| kJ | — | 241 | 45 | 8 | 169 | — | — | 35 | — | — | — | — | — | — | 2 | 9 | 515 | 355 | 527 | 412 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 244 | 0 | 0 | 287 | 0 | 0 | 0 | 0 | 0 | 130 | 0 | 0 | 104 | 0 | 100 | 1236 | 271 | 329 | 795 | 18 |
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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