Surf Forecasts:
Viana do Castelo surf forecast from 29 Jul 2026:
- Best quality surf: Friday 31 Jul, 10PM (local time) - 4.5ft (1.4m), 6s period, NW swell with cross-offshore winds.
- Most powerful swell: Friday 31 Jul, 10PM (local time) - 4.5ft (1.4m), 6s period, NW swell with 135 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 7PM (local time) - 2.5ft (0.7m), 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 Wednesday (Jul 29) at 7PM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.3m and 10s. 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 1.4m 6s and forecast to arrive on Friday (Jul 31) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Friday (Jul 31) at 7PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Wed 29th Jul) | 2.5ft (0.7m) 8s |
| Best Surf | 10PM (Fri 31st Jul) | 4.5ft (1.4m) 6s |
| Most Powerful | 10PM (Fri 31st Jul) | 4.5ft (1.4m) 6s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on the table for Viana do Castelo.
Alright, I gotta be straight with you – the next couple of weeks are looking pretty flat and quiet for Viana do Castelo. We’ve got a big gap of nothing special at the start, so don’t bother paddling out just yet.
We’re looking at Wednesday, the 29th of July, with a tiny 3ft NW swell at 9 seconds, but the cross-shore wind messes it up – poor surf conditions. That sets the tone for a few days. The water’s sitting at 69°, which is a touch warmer than normal for this time of year. The combined swell energy is weak, only 119.
Thursday the 30th of July morning is the first time we see a little hope. The swell drops to 2ft, but it’s a glassy morning with a WNW swell at 10 seconds. It’s surfable but very ordinary. Again, the energy is weak (77). Not a standout.
Friday the 31st of July and Saturday the 1st of August stay small, with the best being Saturday morning – a glassy 2ft W swell at 9 seconds. Combined energy of 139. Still, it’s just ordinary.
Sunday the 2nd and Monday the 3rd of August are more of the same, with poor surf conditions. A real quiet spell.
Now, things start to tick up slightly around Thursday the 6th of August morning. We get a 3ft WSW swell, but the period is short at 6 seconds. It’s clean with a cross-offshore wind, but still just surfable. Energy is 112. Not the one.
The standout of the whole run, and I mean the only one that gets me excited, is Monday the 10th of August morning. We’ve got a 3ft NNW groundswell, period jumping to 11 seconds – that’s proper long-period energy. Combined swell energy is 204, moderate. Winds are light and cross-offshore, so it’ll be clean. This is the best wave of the window: a long-period, clean groundswell. For a river break like Viana do Castelo, longer period swell can shape up nicely. The break is fairly consistent, but the crowds are often here, so don’t expect solitude.
After that, we fade back into small, clean but ordinary conditions through to the 13th of August. Nothing else worth rushing for.
So, if you’ve got one session to pick, aim for the morning of the 10th of August. The rest is a long period of waiting.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Fri morning, min 15°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Sat morning, min 16°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | |||||||||||||||
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 8 | WNW 10 | WNW 10 | WNW 10 | NW 5 | WNW 9 | WNW 9 | NW 6 | W 9 | W 9 | NNW 7 | W 9 | W 10 | W 9 | W 9 | W 9 | W 9 | W 9 | W 8 | W 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 107 | 69 | 55 | 52 | 51 | 41 | 26 | 26 | 105 | 71 | 42 | 116 | 52 | 66 | 81 | 76 | 78 | 57 | 95 | 86 | 71 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | glassy | cross | cross-off | cross-off | cross | cross-off | glassy | cross | cross | cross-on | cross | cross-off | cross-on | on | cross-on | cross-on | on | glassy |
High Tide | 3:52PM3.23m | 4:14AM3.02m | 4:25PM3.32m | 4:46AM3.11m | 4:57PM3.39m | 5:18AM3.16m | 5:31PM3.41m | 5:52AM3.19m | 6:06PM3.38m | 6:30AM3.18m | 6:45PM3.29m | 7:12AM3.12m | 7:29PM3.16m | ||||||||
Low Tide | 10:03PM0.81m | 10:07AM0.85m | 10:35PM0.72m | 10:40AM0.77m | 11:08PM0.66m | 11:15AM0.72m | 11:41PM0.64m | 11:50AM0.73m | 00:18AM0.66m | 12:30PM0.78m | 00:57AM0.73m | 1:14PM0.89m | 1:42AM0.85m | ||||||||
 | |  |  | | | | | | | | | | |  | | | | | | | |
 | 6:26 | — | — | 6:26 | — | — | 6:28 | — | — | 6:28 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — |
 | — | 8:57 | — | — | 8:55 | — | — | 8:54 | — | — | 8:52 | — | — | 8:52 | — | — | 8:51 | — | — | 8:50 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 20 | 17 | 20 | 20 | 17 | 21 | 21 | 19 | 22 | 22 | 18 | 21 | 21 | 18 | 22 | 22 | 20 | 23 | 23 | 20 |
Feels °C | 20 | 19 | 17 | 20 | 20 | 18 | 20 | 19 | 20 | 22 | 23 | 19 | 21 | 21 | 18 | 21 | 22 | 22 | 23 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | NW 9 | NW 8 | NW 8 | WNW 10 | WNW 10 | NW 5 | WNW 9 | WNW 9 | NW 6 | NW 6 | W 9 | NNW 7 | W 9 | W 10 | W 9 | W 9 | W 9 | W 6 | W 9 | W 8 | W 8 |
| kJ | 107 | 69 | 32 | 52 | 51 | 41 | 26 | 26 | 105 | 54 | 42 | 116 | 52 | 66 | 81 | 76 | 78 | 38 | 95 | 86 | 71 |
Swell 2 Height (m) Direction Period (s) | WNW 11 | WNW 10 | WNW 10 | NW 8 | N 9 | WNW 9 | NW 8 | W 11 | W 9 | W 9 | WSW 8 | W 9 | NW 5 | NNW 7 | NW 4 | NNW 7 | NNW 8 | W 9 | N 10 | NNW 9 | NNW 8 |
| kJ | 12 | 21 | 55 | 23 | 2 | 26 | 9 | 10 | 61 | 71 | 22 | 38 | 14 | 5 | 5 | 5 | 6 | 57 | 7 | 8 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | N 10 | NW 3 | — | NW 8 | W 12 | NW 9 | NNW 8 | NNW 8 | NW 8 | WSW 8 | NNW 7 | — | NNW 7 | NNW 4 | S 15 | NNW 8 | NNW 8 | SW 13 | SW 13 |
| kJ | — | — | 2 | 2 | — | 10 | 3 | 3 | 7 | 14 | 16 | 12 | 10 | — | 5 | 1 | 4 | 6 | 6 | 7 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NW 8 | — | NNW 5 | NW 4 | — | — | NNW 6 | — | — | NW 4 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 31 | — | 14 | 27 | — | — | 24 | — | — | 9 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 111 | 0 | 0 | 224 | 0 | 19 | 130 | 0 | 0 | 104 | 10 | 114 | 100 | 0 | 29 | 104 | 104 | 56 | 104 | 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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