Surf Forecasts:
Viana do Castelo surf forecast from 1 Sep 2026:
- Best quality surf: Monday 7 Sep, 7PM (local time) - 7ft (2.2m), 11s period, NW swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 10PM (local time) - 7.5ft (2.3m), 11s period, NW swell with 1,232 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 10PM (local time) - 5ft (1.6m), 8s 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 Tuesday (Sep 01) at 10PM. The primary swell is predicted to be 1.6m and 8s period with a secondary swell of 0.1m and 15s. 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 2.3m 11s and forecast to arrive on Monday (Sep 07) at 10PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Monday (Sep 07) at 4PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Tue 1st Sep) | 5ft (1.6m) 8s |
| Best Surf | 7PM (Mon 7th Sep) | 7ft (2.2m) 11s |
| Most Powerful | 10PM (Mon 7th Sep) | 7.5ft (2.3m) 11s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright, Rusty here, talkin’ in feet and miles per hour for the crew that thinks in Freedom Units. Let’s look at Viana do Castelo.
The first few days are small and ordinary. Don’t bother before Thursday. The real window kicks off around Sunday, September 6th, and runs through the middle of the next week. The standout is Monday morning, September 7th, at the river mouth. Swell is 4ft from the WNW, 10-second period, light offshore breeze from the N (around 9 mph), and the water temp is 67°, which is normal for this time of year. Combined energy is 418 (moderate). It’s clean, it’s got push, and the river mouth will handle it nicely. Crowds are likely – expect company.
Tuesday morning, September 1st, is a tease: 5ft from the NW, 9 seconds, light cross-off wind at 6 mph, clean, with 369 (moderate) energy. Afternoon gets windier and drops.
Sunday morning, September 6th, is glassy – 4ft NW, 11 seconds, no wind, energy 386 (moderate). Get out early before the afternoon cross-shore. Monday morning, September 7th, is the best: 4ft, WNW, 10 seconds, light offshore (9 mph), clean, energy 418 (moderate). Tuesday morning, 8th September, is 4ft from the NW, 9 seconds, light offshore, energy 214 (moderate), clean.
Thursday, 10th September, brings 4ft from the NW, 10 seconds, light offshore (6 mph), energy 439 (moderate). Solid morning. Friday, 11th September, has 5ft from the NNW but with a short 6-second period, light offshore, energy 314 (moderate). It’ll be weaker and a bit jumbled.
The second week drops off hard. Sunday, 13th September, is tiny (1ft), glassy, but not worth it. Monday and Tuesday mornings, 14th and 15th September, bounce back with 3ft and 3ft WNW swells, 11-12 seconds, glassy or light offshore winds. Energy is 372 and 451 (moderate) – promising but less certain. Wednesday, 16th September, ends with a glassy 3ft NW, 11 seconds, 276 (moderate) energy – clean finish.
It’s not a massive swell window, but early mornings through the first week are your best bets. The combined energy stays moderate, not strong. The river mouth handles the longer periods well, but short-period stuff (under 8 seconds) will be messy. Pick your mornings.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Thu morning, min 16°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 31°C on Sat morning, min 19°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | |||||||||||||||
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 9 | NW 9 | NW 8 | NW 8 | WNW 8 | NW 6 | WNW 9 | WNW 9 | WNW 8 | WNW 8 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | NW 12 | NW 11 | NW 11 | WNW 14 | WNW 11 | WNW 12 | NW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 359 | 351 | 266 | 30 | 24 | 108 | 59 | 59 | 76 | 90 | 116 | 113 | 127 | 124 | 200 | 344 | 254 | 160 | 674 | 660 | 886 |
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 | glassy | glassy | cross-off | cross | cross-off | glassy | off | cross-off | cross | on | glassy | cross-off | cross | glassy |
High Tide | 6:21PM3.33m | 6:45AM3.25m | 7:05PM3.14m | 7:34AM3.08m | 8:00PM2.90m | 8:36AM2.90m | 9:13PM2.68m | 9:59AM2.78m | 10:52PM2.60m | 11:36AM2.81m | 00:27AM2.70m | 12:57PM2.98m | 1:37AM2.92m | ||||||||
Low Tide | 12:07PM0.65m | 00:29AM0.66m | 12:52PM0.81m | 1:14AM0.85m | 1:44PM1.01m | 2:09AM1.08m | 2:54PM1.21m | 3:26AM1.28m | 4:32PM1.31m | 5:07AM1.34m | 6:10PM1.20m | 6:35AM1.21m | 7:21PM0.98m | ||||||||
 | |  | | | | | | |  | |  | | | | | | | | | | |
 | 7:00 | — | — | 7:01 | — | — | 7:01 | — | — | 7:03 | — | — | 7:03 | — | — | 7:05 | — | — | 7:05 | — | — |
 | — | 8:08 | — | — | 8:07 | — | — | 8:06 | — | — | 8:04 | — | — | 8:02 | — | — | 8:00 | — | — | 7:59 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 20 | 18 | 24 | 25 | 24 | 28 | 28 | 24 | 27 | 26 | 25 | 31 | 31 | 29 | 29 | 25 | 21 | 25 | 24 | 20 |
Feels °C | 20 | 18 | 17 | 22 | 22 | 22 | 27 | 27 | 23 | 25 | 24 | 23 | 30 | 29 | 28 | 28 | 25 | 23 | 24 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | NW 9 | SW 16 | SW 15 | NW 8 | WNW 8 | NW 6 | NNW 6 | WNW 9 | WNW 8 | WNW 8 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 8 | NW 11 | NW 11 | WNW 8 | WNW 11 | WNW 12 | — |
| kJ | 359 | 9 | 9 | 30 | 22 | 108 | 22 | 59 | 76 | 90 | 116 | 113 | 127 | 124 | 101 | 344 | 254 | 92 | 674 | 660 | — |
Swell 2 Height (m) Direction Period (s) | SW 16 | — | — | NNW 8 | SSW 16 | WNW 9 | WNW 9 | NW 6 | NW 8 | SW 14 | SW 13 | NW 5 | NW 5 | NW 11 | NW 12 | WNW 9 | SW 12 | NNW 10 | NNW 10 | — | — |
| kJ | 10 | — | — | 11 | 24 | 17 | 59 | 9 | 3 | 8 | 7 | 16 | 7 | 73 | 200 | 84 | 5 | 130 | 54 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | SSW 15 | W 11 | SSW 16 | SSW 15 | SW 14 | SW 14 | — | — | SW 13 | NW 11 | SW 12 | NW 9 | SW 12 | — | WNW 14 | — | — | — |
| kJ | — | — | — | 21 | 2 | 24 | 21 | 8 | 8 | — | — | 7 | 20 | 6 | 13 | 6 | — | 160 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NW 9 | NW 8 | NW 5 | NW 5 | — | — | — | — | — | NW 3 | — | — | — | — | — | WNW 9 | N 4 | NW 5 | NW 5 | NW 10 |
| kJ | — | 351 | 266 | 28 | 33 | — | — | — | — | — | 2 | — | — | — | — | — | 116 | 6 | 32 | 94 | 886 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 100 | 0 | 0 | 100 | 0 | 0 | 0 | 0 | 0 | 100 | 0 | 0 | 0 | 0 | 10 | 100 | 0 | 0 | 14 | 2 |
Best forecast wave conditions in Douro and Minho | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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