Surf Forecasts:
Viana do Castelo surf forecast from 13 Aug 2026:
- Best quality surf: Saturday 15 Aug, 7AM (local time) - 7ft (2.1m), 8s period, NW swell with cross-offshore winds.
- Most powerful swell: Saturday 15 Aug, 7PM (local time) - 10ft (3.0m), 8s period, NNW swell with 874 kJ wave energy.
- Next surfable swell (1★+): Friday 14 Aug, 1AM (local time) - 3ft (0.9m), 9s 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 Friday (Aug 14) at 1AM. The primary swell is predicted to be 0.9m and 9s period. 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 3.0m 8s and forecast to arrive on Saturday (Aug 15) at 7PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Friday (Aug 14) at 4PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Fri 14th Aug) | 3ft (0.9m) 9s |
| Best Surf | 7AM (Sat 15th Aug) | 7ft (2.1m) 8s |
| Most Powerful | 7PM (Sat 15th Aug) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright, Rusty here again, givin' it to you in feet and miles per hour.
We're lookin' at Viana do Castelo, a river mouth setup. Water temp is about 68°F, right where it should be for this time of year. The pattern is a slow burner.
Thursday the 13th starts weak. We got a 4ft W swell with a 10-second period, but a light cross-on breeze messes it up. The wave energy is weak, don't even bother. Thursday afternoon is even worse with a cross-shore chop.
Friday the 14th morning cleans up with a light cross-off wind, but the swell drops to 3ft from the WNW, period at 9 seconds, and energy is just moderate. Surfable, but ho-hum.
Now, Saturday the 15th morning pumps up to 7ft from the NW, but with a short 8-second period. The energy is getting there (moderate), and the wind is clean. But the warning is loud and clear: this is too big for this break. Over 7ft is expert-only territory, and the short period will make it dumpy. Afternoon gets bigger and windier, a no-go.
Sunday the 16th morning is your best early bet: 5ft from the NNW, short period, but light cross-off wind means clean waves. This is a fun size for most surfers. The afternoon gets blown out again.
Then we hit a real flat patch from the 19th to the 22nd. The second week's highlight is Monday the 24th morning. We get a clean 5ft NW swell, 8-second period, moderate energy, and light cross-off wind. That’s the session to aim for.
Finally, on Friday the 28th morning, we get glassy conditions with a 3ft WNW swell, a longer 11-second period, and moderate energy. The glassy wind is a big plus for the river mouth.
The pick of the whole run is Sunday the 16th morning and Monday the 24th morning. Clean, good size for the spot, and manageable. The rest is pretty patchy. Don’t plan a trip around it, but you’ll find a couple windows.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Sat afternoon, min 18°C on Thu night). Winds increasing (light winds from the W on Thu morning, strong winds from the NNW by Sat afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 33°C on Tue afternoon, min 20°C on Sun night). Winds increasing (light winds from the N on Sun morning, fresh winds from the NNW by Mon afternoon). | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | W 10 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | NNW 7 | NW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 6 | NNW 8 | NNW 8 | NW 6 | NNW 7 | NNW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 250 | 250 | 153 | 116 | 90 | 372 | 532 | 750 | 441 | 183 | 213 | 392 | 157 | 133 | 226 | 28 | 55 | 51 | 32 | 93 | 335 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | off | cross-off | cross-off | cross-off |
High Tide | 4:25PM3.65m | 4:51AM3.42m | 5:05PM3.63m | 5:30AM3.39m | 5:43PM3.54m | 6:07AM3.29m | 6:19PM3.37m | 6:43AM3.15m | 6:55PM3.16m | 7:20AM2.98m | 7:33PM2.93m | 8:00AM2.80m | 8:16PM2.69m | ||||||||
Low Tide | 10:08AM0.55m | 10:37PM0.39m | 10:48AM0.53m | 11:16PM0.42m | 11:26AM0.60m | 11:52PM0.52m | 12:03PM0.72m | 00:28AM0.68m | 12:40PM0.89m | 1:03AM0.88m | 1:18PM1.08m | 1:40AM1.10m | 2:01PM1.29m | 2:23AM1.32m | |||||||
 | |  | |  | | | | | | | | | | | | | | | | | |
 | 6:41 | — | — | 6:41 | — | — | 6:43 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — | 6:47 | — | — |
 | — | 8:37 | — | — | 8:37 | — | — | 8:36 | — | — | 8:34 | — | — | 8:32 | — | — | 8:30 | — | — | 8:30 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 23 | 20 | 24 | 24 | 22 | 26 | 27 | 22 | 27 | 27 | 23 | 30 | 32 | 27 | 32 | 33 | 29 | 29 | 29 | 23 |
Feels °C | 23 | 23 | 21 | 23 | 22 | 20 | 22 | 22 | 20 | 25 | 25 | 20 | 28 | 28 | 22 | 30 | 30 | 26 | 26 | 26 | 19 |
Swell 1 Height (m) Direction Period (s) | W 10 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | S 12 | — | — | S 18 | NNW 7 | W 8 | SW 18 | NNW 8 | W 9 | NNW 8 | NNW 6 | NNW 8 | NNW 8 | NW 6 | WNW 10 | NNW 11 |
| kJ | 250 | 250 | 153 | 116 | 90 | 3 | — | — | 7 | 183 | 5 | 12 | 157 | 6 | 226 | 28 | 55 | 51 | 32 | 10 | 13 |
Swell 2 Height (m) Direction Period (s) | NW 4 | N 8 | — | — | — | — | — | — | — | W 8 | SW 17 | — | W 8 | SW 17 | W 8 | NNW 8 | W 8 | W 8 | W 8 | W 8 | SW 14 |
| kJ | 9 | 1 | — | — | — | — | — | — | — | 5 | 12 | — | 6 | 12 | 5 | 26 | 5 | 12 | 11 | 5 | 8 |
Swell 3 Height (m) Direction Period (s) | NNW 8 | — | — | — | — | — | — | — | — | SW 18 | — | — | SW 16 | — | SW 17 | W 8 | SW 16 | SSW 16 | SW 14 | SSW 14 | — |
| kJ | 7 | — | — | — | — | — | — | — | — | 12 | — | — | 10 | — | 11 | 5 | 10 | 24 | 8 | 20 | — |
Wind waves Height (m) Direction Period (s) | — | NW 4 | NW 6 | NW 5 | NW 6 | NNW 7 | NW 8 | NNW 8 | NNW 8 | — | NNW 8 | NNW 8 | — | NNW 8 | — | — | — | — | — | NNW 7 | NNW 7 |
| kJ | — | 5 | 72 | 42 | 104 | 372 | 532 | 750 | 441 | — | 213 | 392 | — | 133 | — | — | — | — | — | 93 | 335 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 120 | 0 | 0 | 305 | 19 | 19 | 284 | 18 | 0 | 284 | 0 | 0 | 258 | 18 | 0 | 1039 | 0 | 0 | 248 | 151 |
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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