Surf Forecasts:
Viana do Castelo surf forecast from 4 Aug 2026:
- Best quality surf: Friday 7 Aug, 1AM (local time) - 5ft (1.5m), 7s period, NNW swell with cross-offshore winds.
- Most powerful swell: Wednesday 5 Aug, 7PM (local time) - 4.5ft (1.4m), 8s period, NW swell with 256 kJ wave energy.
- Next surfable swell (1★+): Tuesday 4 Aug, 10PM (local time) - 2.5ft (0.8m), 8s 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 Tuesday (Aug 04) at 10PM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.5m 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 8s and forecast to arrive on Wednesday (Aug 05) 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 5s period and expected on Monday (Aug 10) at 7PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Tue 4th Aug) | 2.5ft (0.8m) 8s |
| Best Surf | 1AM (Fri 7th Aug) | 5ft (1.5m) 7s |
| Most Powerful | 7PM (Wed 5th Aug) | 4.5ft (1.4m) 8s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let's have a look at the waves coming up for Viana do Castelo.
First up, the water temp is sitting at about 66°F, which is pretty much bang on average for this time of year. So, no surprises there.
The outlook for the next week is a bit of a tough one. We're seeing a lot of small, weak swell and not much in the way of clean conditions. The first few days are a real write-off, with poor surf and cross-onshore winds messing things up. Wednesday the 5th shows a little bit of life with a clean 2ft swell from the NW, but it's only a score of 1 out of 10 – honest, it's just ordinary. The energy is weak (179) and the swell is short period, so it'll be a bit bumpy.
We get a bit of a glassy window on Friday the 7th morning, with a tiny 3ft swell from the NNW, but again, the energy is low (96) and the swell period is short. It's surfable, but you won't be stoked. The following weekend is a bust with tiny waves and cross-shore winds.
The first real standout in the whole 16-day window looks like Monday the 17th of August. The morning session is where it's at. The wind is forecast to be glassy, with a clean 5ft swell from the NNW. The combined energy is moderate (249), and the period is a short 8 seconds, so it won't be a groundswell, but with glassy conditions, it'll be the best we've seen. This is a river break, so it can get a bit of a crowd, but for that morning, it's worth the paddle.
The following Saturday afternoon, the 15th of August, sees a bigger pulse of 6ft from the NW (energy 414), but it's a short period and the wind is cross-shore. It's a big enough wave, but it's messy, so it's more of a "maybe" day.
Overall, the first week is a bit of a dud, so don't get your hopes up. The second week offers a bit more promise, but it's nothing to write home about. The best bet is that Monday the 17th morning.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Thu morning, min 16°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Thu afternoon, min 17°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Mon 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | ||||||||||||||
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 8 | W 8 | W 9 | W 8 | W 8 | NW 10 | NW 9 | NW 6 | W 10 | WNW 10 | NNW 7 | NNW 7 | NNW 8 | NW 7 | W 9 | W 9 | NW 11 | NNW 10 | NW 10 | NW 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 208 | 141 | 120 | 109 | 86 | 96 | 193 | 157 | 54 | 31 | 198 | 57 | 51 | 65 | 14 | 14 | 31 | 67 | 45 | 38 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | cross-on | on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross | cross-off | glassy | cross | cross-off | glassy | cross | cross-off |
High Tide | 6:45PM3.29m | 7:12AM3.12m | 7:29PM3.16m | 8:01AM3.03m | 8:22PM2.99m | 9:00AM2.92m | 9:28PM2.82m | 10:14AM2.85m | 10:51PM2.72m | 11:39AM2.88m | 00:21AM2.76m | 12:59PM3.03m | 1:36AM2.92m | |||||||
Low Tide | 00:57AM0.73m | 1:14PM0.89m | 1:42AM0.85m | 2:06PM1.03m | 2:36AM1.00m | 3:12PM1.17m | 3:46AM1.14m | 4:37PM1.24m | 5:10AM1.19m | 6:07PM1.17m | 6:33AM1.11m | 7:22PM0.98m | ||||||||
 |  | |  |  | | | | | | | | | | | | | | | | |
 | — | — | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — |
 | 8:51 | — | — | 8:50 | — | — | 8:49 | — | — | 8:47 | — | — | 8:45 | — | — | 8:45 | — | — | 8:44 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 19 | 22 | 22 | 19 | 22 | 21 | 19 | 25 | 25 | 23 | 22 | 22 | 18 | 23 | 22 | 19 | 22 | 21 | 19 |
Feels °C | 21 | 21 | 22 | 23 | 19 | 19 | 17 | 17 | 22 | 21 | 21 | 21 | 20 | 16 | 22 | 21 | 19 | 22 | 20 | 19 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 9 | W 8 | W 8 | WNW 8 | W 7 | NNW 8 | NNW 8 | WNW 10 | WNW 9 | NNW 7 | W 9 | NW 7 | NW 5 | W 9 | NW 11 | NNW 10 | NW 10 | NNW 5 |
| kJ | 208 | 141 | 120 | 109 | 86 | 63 | 26 | 64 | 54 | 31 | 29 | 57 | 15 | 65 | 11 | 14 | 31 | 67 | 45 | 32 |
Swell 2 Height (m) Direction Period (s) | NW 8 | N 8 | NNW 9 | NW 11 | NW 11 | NW 10 | WNW 10 | WNW 10 | W 10 | SW 12 | SW 13 | NNW 8 | SW 13 | W 9 | W 9 | NNW 7 | W 8 | W 7 | W 7 | W 7 |
| kJ | 2 | 1 | 7 | 30 | 55 | 96 | 33 | 33 | 49 | 5 | 6 | 24 | 7 | 14 | 14 | 4 | 22 | 25 | 23 | 23 |
Swell 3 Height (m) Direction Period (s) | S 15 | SW 14 | NW 11 | N 9 | SW 13 | WNW 10 | SW 12 | SW 12 | SW 12 | — | — | W 9 | S 11 | N 9 | NNW 7 | NW 12 | NW 3 | W 8 | S 13 | NW 9 |
| kJ | 4 | 7 | 5 | 6 | 7 | 20 | 6 | 6 | 6 | — | — | 15 | 2 | 6 | 5 | 6 | 2 | 1 | 3 | 38 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NW 9 | NW 6 | NNW 5 | NNW 5 | NNW 7 | — | NNW 8 | — | — | NW 4 | — | — | NW 3 | — |
| kJ | — | — | — | — | — | — | 193 | 157 | 42 | 90 | 198 | — | 51 | — | — | 3 | — | — | 3 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 104 | 0 | 56 | 100 | 0 | 0 | 151 | 2 | 0 | 182 | 0 | 0 | 151 | 0 | 38 | 104 | 0 | 0 | 146 | 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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