Surf Forecasts:
Viana do Castelo surf forecast from 7 Sep 2026:
- Best quality surf: Monday 7 Sep, 7AM (local time) - 6ft (1.8m), 13s period, WNW swell with cross-offshore winds.
- Most powerful swell: Sunday 13 Sep, 1PM (local time) - 5.5ft (1.7m), 14s period, NW swell with 1,123 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 4AM (local time) - 5ft (1.5m), 13s period with W 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 4AM. The primary swell is predicted to be 1.5m and 13s period with a secondary swell of 0.8m and 9s. 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 1.7m 14s and forecast to arrive on Sunday (Sep 13) at 1PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Friday (Sep 11) at 4AM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Mon 7th Sep) | 5ft (1.5m) 13s |
| Best Surf | 7AM (Mon 7th Sep) | 6ft (1.8m) 13s |
| Most Powerful | 1PM (Sun 13th Sep) | 5.5ft (1.7m) 14s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright mates, Rusty here. Let’s break down the upcoming swell for Viana do Castelo.
The first few days are a bit slow to start, but there’s some real juice building for the middle of the month. Water temp is 66°F, which is dead average for this time of year, so nothing weird there.
We get going on Sunday the 6th with a small 3ft NW swell, but it’s just so-so. The energy is moderate (465) and the cross-off wind keeps it clean, but the quality is only marginal. Monday the 7th is a big step up – 6ft from the WNW with a long 12-second period, and the energy is solid (1015). That morning session is the clear standout for the week for experienced surfers; the cross-off breeze is light and the waves will have some real grunt. The afternoon drops to 5ft, but the wind picks up, so the morning is the time.
Tuesday the 8th is a washout with rain and a cross-shore wind, dropping to 3ft. Wednesday the 9th has a punchy 6ft NW swell, but that 35 km/h NNW wind is a killer, making it a write-off. Thursday the 10th is a better option with a clean 5ft NNW swell, light winds, and moderate energy (408). Friday the 11th fades fast, and the weekend is tiny.
Now, the real highlight. Look ahead to Sunday the 13th. The morning brings a 5ft NW groundswell with a very long 14-second period and strong energy (980). The wind is glassy – dead calm – so you’re looking at clean, powerful lines. This is a classic river mouth setup, so the long period will wrap in nicely. It’s the best on offer. Monday the 14th holds some 4ft leftovers, but the wind is stronger.
The 16-day window shows a bit more life in the second week. Wednesday the 16th has a glassy 3ft WNW swell, nothing special. But Thursday the 17th afternoon is a sleeper: 5ft NW swell, clean, glassy, and strong energy (521). That’s another one to circle. Friday the 18th gets a bit bigger but the wind turns onshore, so it’s messy. Saturday the 19th morning is a solid 5ft NW with a light offshore breeze – clean and punchy. The energy is strong (724), so it’ll be a good session for those who can handle it.
The final weekend (20th and 21st) fades into small, poor conditions. All in all, the best windows are Monday the 7th morning, Sunday the 13th morning, and Thursday the 17th afternoon.
– Rusty
Short Range ForecastLight rain (total 6mm), mostly falling on Tue afternoon. Warm (max 24°C on Mon morning, min 15°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 31°C on Sat morning, min 16°C on Wed night). Winds decreasing (fresh winds from the NNW on Wed afternoon, calm by Sat morning). | |||||||||||||||||||
Sun 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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 10 | WNW 14 | WNW 12 | WNW 12 | WNW 11 | WNW 10 | NW 9 | NW 8 | NW 8 | NW 8 | NNW 8 | NNW 10 | NNW 10 | NNW 6 | NW 6 | NW 8 | NW 6 | WNW 10 | NW 16 | NW 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 212 | 811 | 976 | 718 | 572 | 305 | 95 | 389 | 346 | 398 | 306 | 378 | 241 | 155 | 47 | 15 | 71 | 72 | 86 | 345 |
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 | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | off | glassy | cross-off | off |
High Tide | 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 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:09 | — | — | 7:11 | — | — |
 | 8:00 | — | — | 7:59 | — | — | 7:57 | — | — | 7:55 | — | — | 7:53 | — | — | 7:52 | — | — | 7:51 | — |
mm | — | — | — | — | — | — | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 19 | 24 | 22 | 18 | 21 | 19 | 18 | 21 | 23 | 18 | 22 | 22 | 21 | 26 | 29 | 26 | 31 | 30 | 28 |
Feels °C | 21 | 18 | 23 | 20 | 17 | 21 | 20 | 17 | 17 | 17 | 14 | 20 | 19 | 18 | 22 | 26 | 24 | 29 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | NW 10 | WNW 14 | WNW 12 | WNW 12 | WNW 11 | WNW 10 | NW 9 | — | NW 8 | — | NNW 11 | NNW 10 | NNW 10 | NNW 10 | NW 6 | NW 8 | NW 6 | WNW 10 | WNW 9 | NW 13 |
| kJ | 212 | 811 | 976 | 718 | 572 | 305 | 95 | — | 346 | — | 151 | 378 | 241 | 31 | 47 | 15 | 71 | 72 | 66 | 345 |
Swell 2 Height (m) Direction Period (s) | W 18 | NW 10 | NW 9 | NW 9 | NNW 8 | — | W 9 | — | NW 11 | — | NW 10 | W 8 | W 8 | W 7 | NW 9 | W 7 | WNW 10 | NW 5 | NW 16 | NNW 7 |
| kJ | 156 | 110 | 39 | 20 | 7 | — | 79 | — | 32 | — | 16 | 20 | 10 | 9 | 19 | 4 | 35 | 13 | 86 | 66 |
Swell 3 Height (m) Direction Period (s) | SW 12 | WNW 9 | — | — | — | — | — | — | — | — | WNW 12 | W 11 | W 10 | W 10 | NNW 9 | NNW 9 | W 8 | NNW 8 | NW 11 | W 8 |
| kJ | 5 | 90 | — | — | — | — | — | — | — | — | 14 | 10 | 9 | 8 | 16 | 8 | 11 | 11 | 31 | 35 |
Wind waves Height (m) Direction Period (s) | WNW 9 | — | — | NW 3 | — | — | — | NW 8 | — | NW 8 | NNW 8 | — | — | NNW 6 | — | NW 5 | — | — | NW 5 | — |
| kJ | 92 | — | — | 5 | — | — | — | 389 | — | 398 | 306 | — | — | 155 | — | 30 | — | — | 12 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 100 | 0 | 0 | 100 | 0 | 0 | 151 | 100 | 19 | 130 | 19 | 0 | 151 | 19 | 0 | 182 | 0 | 0 | 0 | 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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