Surf Forecasts:
Viana do Castelo surf forecast from 5 Sep 2026:
- Best quality surf: Monday 7 Sep, 4AM (local time) - 5ft (1.5m), 13s period, W 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★+): Sunday 6 Sep, 1AM (local time) - 4.5ft (1.4m), 12s 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 Sunday (Sep 06) at 1AM. The primary swell is predicted to be 1.4m and 12s 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 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 1.7m 6s period and expected on Thursday (Sep 10) at 7PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sun 6th Sep) | 4.5ft (1.4m) 12s |
| Best Surf | 4AM (Mon 7th Sep) | 5ft (1.5m) 13s |
| 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 lads, Rusty here. Let’s break down the surf at Viana do Castelo for the next couple of weeks.
First off, don’t bother with Saturday afternoon. It’s a weak 4ft NW swell with a cross-on breeze – messy and marginal. The energy is low (625) and it’s just not worth paddling out.
Sunday morning is cleaner with a cross-off wind, but the swell is still only 4ft. Water temp is 68°F, which is standard for this time of year – nothing weird. The real standout is Monday, September 7th. Monday morning is the best of the first week. We’ve got a solid 6ft WNW groundswell (period 12 seconds) with a clean cross-off wind. The energy is pumping (1101) – strong stuff. This is excellent surf for experienced surfers. At 6ft, it’s too big for beginners. The river mouth will handle the long period well, shaping up clean waves. Monday afternoon gets windier, so get out early.
Tuesday the 8th drops to 4ft, still clean in the morning. Wednesday the 9th is a write-off – the swell is 6ft but the wind is up to 22 mph, just making a mess. Thursday the 10th is marginal. By Friday the 11th, the swell dies to 2ft and 1ft – tiny leftovers. That flat spell runs through the weekend, with a small bump on Sunday the 13th (3ft, longer period 11 seconds) but it’s still not great.
Then we get a bit of hope. Monday the 14th is glassy in the morning with a 5ft NW swell. That’s a clean session, though the energy is moderate (393). Not a standout, but a solid session. Tuesday the 15th is glassy again but only 2ft – too small. The real second-week highlight is Wednesday, September 16th morning. That’s glassy, 3ft NW swell with a very long period of 13 seconds. The energy is strong (571) and the conditions are set for a very good session. The long period will make the river mouth waves peel nicely.
After that, it’s a slow fade back to small, clean but unremarkable surf through the 19th and 20th. Mostly 4ft days with glassy or light winds – fine for a longboard.
If you’re picking one session, it’s Monday morning, September 7th – that’s the one. The Wednesday 16th morning is a solid backup, but it’s a long way out. Viana do Castelo gets crowded often on the good days, so set your alarm early.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sat afternoon, min 16°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Tue afternoon. Warm (max 24°C on Fri morning, min 14°C on Tue night). Winds increasing (light winds from the WNW on Tue afternoon, fresh winds from the NNW by Wed afternoon). | |||||||||||||||||||
Sat 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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 13 | NW 12 | 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 | W 7 | NW 9 | W 7 | W 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 495 | 555 | 332 | 212 | 811 | 1002 | 718 | 627 | 325 | 109 | 327 | 398 | 434 | 257 | 471 | 356 | 9 | 49 | 8 | 3 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:52PM2.60m | 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 | ||||||||
Low Tide | 4:32PM1.31m | 5:07AM1.34m | 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 | |||||||
 |  | | | | | | |  |  | | | | | | | | | | | |
 | — | — | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:09 | — | — |
 | 8:02 | — | — | 8:00 | — | — | 7:59 | — | — | 7:57 | — | — | 7:55 | — | — | 7:53 | — | — | 7:52 | — |
mm | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 23 | 23 | 22 | 19 | 24 | 22 | 18 | 21 | 20 | 19 | 21 | 23 | 18 | 21 | 21 | 18 | 24 | 26 | 22 |
Feels °C | 25 | 23 | 23 | 21 | 18 | 22 | 20 | 17 | 20 | 21 | 20 | 16 | 17 | 14 | 17 | 16 | 15 | 20 | 22 | 19 |
Swell 1 Height (m) Direction Period (s) | NW 13 | NW 12 | NW 11 | NW 10 | WNW 14 | WNW 12 | WNW 12 | WNW 11 | WNW 10 | NW 9 | — | NW 8 | — | NNW 11 | NNW 10 | W 7 | W 7 | NW 9 | W 7 | W 11 |
| kJ | 495 | 555 | 332 | 212 | 811 | 1002 | 718 | 627 | 325 | 109 | — | 398 | — | 219 | 471 | 10 | 9 | 49 | 8 | 2 |
Swell 2 Height (m) Direction Period (s) | WNW 9 | WNW 9 | WNW 9 | W 18 | NW 10 | NNW 9 | — | NNW 8 | — | W 9 | — | NW 11 | — | W 8 | W 8 | W 11 | W 10 | NNW 9 | W 8 | W 13 |
| kJ | 124 | 64 | 84 | 156 | 110 | 31 | — | 7 | — | 79 | — | 31 | — | 21 | 19 | 2 | 8 | 16 | 1 | 3 |
Swell 3 Height (m) Direction Period (s) | SW 12 | SW 12 | SW 12 | SW 12 | WNW 9 | — | — | — | — | — | — | — | — | W 12 | W 11 | — | — | W 7 | S 15 | — |
| kJ | 6 | 6 | 6 | 5 | 90 | — | — | — | — | — | — | — | — | 3 | 2 | — | — | 8 | 4 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | WNW 9 | — | NNW 9 | NW 4 | — | — | — | NW 8 | — | NW 8 | NNW 7 | NNW 7 | NNW 10 | NNW 6 | NNW 5 | NNW 5 | NNW 6 |
| kJ | — | — | — | 116 | — | 68 | 13 | — | — | — | 327 | — | 434 | 257 | 147 | 356 | 173 | 25 | 74 | 112 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 100 | 0 | 0 | 100 | 2 | 0 | 100 | 14 | 0 | 611 | 100 | 312 | 130 | 18 | 2 | 146 | 5 | 0 | 151 | 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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