Surf Forecasts:
Viana do Castelo surf forecast from 9 Aug 2026:
- Best quality surf: Saturday 15 Aug, 1AM (local time) - 7ft (2.1m), 7s period, NW swell with cross-offshore winds.
- Most powerful swell: Saturday 15 Aug, 7PM (local time) - 8ft (2.5m), 8s period, NW swell with 782 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 10PM (local time) - 2.5ft (0.8m), 7s 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 Sunday (Aug 09) at 10PM. The primary swell is predicted to be 0.6m and 9s period with a secondary swell of 0.8m 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 2.5m 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 1.4m 6s period and expected on Thursday (Aug 13) at 10PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sun 9th Aug) | 2.5ft (0.8m) 7s |
| Best Surf | 1AM (Sat 15th Aug) | 7ft (2.1m) 7s |
| Most Powerful | 7PM (Sat 15th Aug) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright, Rusty here again, breaking down the same outlook in feet and miles per hour.
This stretch at Viana do Castelo has waves on the table, but we’ve got to pick the windows wisely. The wind can mess things up quick, and when the swell jumps, it jumps.
First real chance is early Wednesday morning, August 12th. Glassy conditions with a light SSW breeze, 3ft swell from the west at 9 seconds. The energy is moderate at 219. It’s not big, but it’ll be clean and fun at the river mouth. Water temp is about 67°, dead normal for this time of year.
The true standout is Thursday morning, August 13th. Glass again, a clean 3ft west swell at 9 seconds, and the energy sits at 221. That’s the best quality window of the whole run. If you can get out early, that’s the one to paddle for.
Into the weekend, Saturday the 15th, the swell jumps to 6ft in the morning and nearly 8ft by the afternoon, but the period drops to 6 or 7 seconds—short period wind swell. The afternoon brings a 22 mph cross-offshore wind, so it cleans up, but 8ft surf is really expert-only here. The energy hits 563, so there’s serious power, but it’s a big, lumpy beast. Honestly, that setup might be more fun on a kite than a surfboard.
Things go flat and rainy around the 19th and 20th, with a few days of weak, onshore junk. Not worth the effort.
Looking way out to Monday, August 24th, the swell comes back to 6ft from the NW at 8 seconds, with energy at 446. It’s clean and cross-off, but that’s a lot of water for this spot and not for beginners. Worth watching for experts, but don’t book the trip just yet.
Bottom line: Wednesday and Thursday mornings next week are your best bet—clean, friendly waves. The weekend gets big and rough. The rest is a wash.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Sun morning, min 17°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Wed morning, min 17°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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 7 | NNW 10 | NW 9 | NW 8 | NW 8 | NW 9 | NW 8 | NW 10 | W 10 | W 9 | W 9 | W 9 | W 9 | WNW 10 | WNW 9 | WNW 9 | NW 6 | NW 7 | NW 7 | NW 7 | NNW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 81 | 66 | 65 | 60 | 61 | 95 | 53 | 142 | 120 | 175 | 175 | 175 | 139 | 214 | 189 | 146 | 208 | 393 | 365 | 563 | 452 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | cross-off | cross-off | cross | cross-off | cross | cross | glassy | glassy | cross | off | glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 12:59PM3.03m | 1:36AM2.92m | 2:03PM3.24m | 2:36AM3.11m | 2:56PM3.43m | 3:26AM3.28m | 3:43PM3.58m | 4:10AM3.39m | 4:25PM3.65m | 4:51AM3.42m | 5:05PM3.63m | 5:30AM3.39m | 5:43PM3.54m | ||||||||
Low Tide | 7:22PM0.98m | 7:41AM0.95m | 8:22PM0.76m | 8:37AM0.77m | 9:12PM0.57m | 9:25AM0.63m | 9:56PM0.44m | 10:08AM0.55m | 10:37PM0.39m | 10:48AM0.53m | 11:16PM0.42m | 11:26AM0.60m | 11:52PM0.52m | ||||||||
 | |  | | | | | | | | | | | | |  | | | | |  | |
 | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — | 6:39 | — | — | 6:41 | — | — | 6:41 | — | — | 6:43 | — | — |
 | — | 8:44 | — | — | 8:42 | — | — | 8:40 | — | — | 8:39 | — | — | 8:37 | — | — | 8:37 | — | — | 8:36 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 22 | 19 | 22 | 22 | 19 | 22 | 22 | 18 | 23 | 22 | 19 | 23 | 22 | 19 | 23 | 23 | 19 | 23 | 22 | 18 |
Feels °C | 22 | 22 | 19 | 21 | 21 | 18 | 22 | 21 | 18 | 24 | 22 | 19 | 23 | 20 | 18 | 21 | 20 | 16 | 19 | 18 | 15 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 7 | W 7 | NW 8 | WSW 6 | NW 9 | NW 8 | WNW 11 | NW 5 | W 9 | W 9 | W 9 | W 9 | WNW 10 | WNW 9 | WNW 9 | — | — | — | — | S 18 |
| kJ | 81 | 66 | 46 | 60 | 13 | 95 | 53 | 40 | 45 | 175 | 175 | 175 | 139 | 214 | 189 | 146 | — | — | — | — | 7 |
Swell 2 Height (m) Direction Period (s) | NNW 10 | NNW 10 | NW 9 | W 7 | NW 10 | W 6 | NNW 11 | WNW 9 | W 10 | NW 4 | NW 9 | NNW 5 | WNW 11 | — | — | — | — | — | — | — | — |
| kJ | 65 | 63 | 65 | 31 | 16 | 11 | 47 | 8 | 120 | 12 | 22 | 21 | 73 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | S 13 | — | W 11 | W 11 | WNW 10 | W 5 | W 5 | NNW 9 | NNW 9 | — | NNW 9 | NW 4 | — | — | — | — | — | — | — | — |
| kJ | — | 3 | — | 2 | 9 | 20 | 5 | 2 | 32 | 32 | — | 8 | 9 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NW 8 | NW 4 | — | NW 10 | — | — | NW 4 | — | — | NW 4 | NNW 6 | NNW 5 | NW 6 | NW 7 | NW 7 | NW 7 | NNW 7 |
| kJ | — | — | — | — | 61 | 10 | — | 142 | — | — | 7 | — | — | 17 | 115 | 54 | 208 | 393 | 365 | 563 | 452 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 104 | 0 | 0 | 312 | 0 | 19 | 251 | 0 | 0 | 438 | 0 | 0 | 251 | 0 | 0 | 251 | 19 | 130 | 802 | 19 |
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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