Surf Forecasts:
Viana do Castelo surf forecast from 5 Aug 2026:
- Best quality surf: Monday 10 Aug, 10PM (local time) - 2.5ft (0.8m), 9s period, NW swell with cross-offshore winds.
- Most powerful swell: Wednesday 12 Aug, 7PM (local time) - 3.5ft (1.1m), 9s period, W swell with 194 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 10PM (local time) - 2.5ft (0.8m), 8s period with NNW 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 (Aug 05) at 10PM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.6m 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 1.1m 9s and forecast to arrive on Wednesday (Aug 12) 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 1.1m 6s period and expected on Thursday (Aug 06) at 10PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Wed 5th Aug) | 2.5ft (0.8m) 8s |
| Best Surf | 10PM (Mon 10th Aug) | 2.5ft (0.8m) 9s |
| Most Powerful | 7PM (Wed 12th Aug) | 3.5ft (1.1m) 9s |
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 offer for the next couple of weeks.
Honestly, the first week and a half is a bit of a struggle. We’ve got some small waves, but nothing that’s really going to get the heart racing. The first real glimmer of something decent doesn’t roll in until Wednesday the 12th of August. Before that, we’re looking at a lot of mornings with tiny, weak swell and some light glassy conditions that are pretty to look at but not much fun to paddle out into. The combined energy is low, often under 100 (like 95 on Friday the 8th morning), so it’s frustratingly weak.
The standout morning is definitely Wednesday the 12th. Viana do Castelo (river) wakes up with a clean 3 ft wave from the west, with a period of 9 seconds. The wind is glassy, and the combined energy is a solid 214 (moderate). The water’s sitting at 66°, which is about average for this time of year with a slight positive anomaly. This is your best chance for a proper surf. Get on it early because the afternoon gets ruined by a cross-shore wind.
For the rest of the second week, it’s a mixed bag. Thursday the 13th morning is surfable with a similar 3 ft from the west, but the wind is a cross-offshore breeze, which will keep it clean enough. The combined energy is 172. It’s okay, but not a standout.
Then we hit a rough patch. From Friday the 14th afternoon through the weekend, the swell jumps up, but it’s messy. The period drops to 7-8 seconds, and the wind cranks up to 18-25 mph from the north-northwest. The combined energy spikes hard (415, 468), but it’s all wind-driven chop. The wave height on Saturday the 15th morning is 6 ft, but with that short period and strong wind, it’s going to be a washing machine. This is more of a kite-surfing show than a paddle session.
Monday the 17th and Tuesday the 18th mornings see things settle back down to a clean 4-4 ft from the northwest, with a gentle cross-offshore breeze and combined energy around 163-178. It’s surfable, but nothing special.
After that, it fades out. The last few days from the 19th are just small, weak, and windy. Not worth the effort.
So, to keep it simple: Wednesday the 12th of August morning at Viana do Castelo is your best bet. Glassy, clean, 3 ft from the west, and enough energy to make it fun. Get out there.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Thu morning, min 16°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Sat morning, min 16°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | |||||||||||||||
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 10 | NW 9 | NNW 8 | NNW 8 | NNW 8 | NW 6 | NW 8 | W 9 | W 9 | W 9 | W 7 | W 7 | NW 10 | NW 9 | NW 9 | NW 10 | NW 9 | NW 8 | NW 10 | NNW 10 | W 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 96 | 148 | 90 | 108 | 105 | 83 | 65 | 26 | 14 | 24 | 39 | 46 | 47 | 67 | 61 | 47 | 97 | 118 | 148 | 125 | 148 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross | cross | cross-off | glassy | cross | cross-off | glassy | cross | off | glassy | cross | cross-off | glassy | cross | cross-off | glassy | cross | cross-off |
High Tide | 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 | 2:03PM3.24m | 2:36AM3.11m | 2:56PM3.43m | 3:26AM3.28m | ||||||||
Low Tide | 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 | 7:41AM0.95m | 8:22PM0.76m | 8:37AM0.77m | 9:12PM0.57m | ||||||||
 | |  | | | | | | | | | | | | | | | | | | | |
 | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — |
 | — | 8:49 | — | — | 8:47 | — | — | 8:45 | — | — | 8:45 | — | — | 8:44 | — | — | 8:42 | — | — | 8:40 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 21 | 18 | 23 | 23 | 19 | 22 | 22 | 19 | 23 | 23 | 20 | 22 | 22 | 19 | 22 | 21 | 18 | 22 | 22 | 18 |
Feels °C | 20 | 18 | 17 | 21 | 20 | 18 | 22 | 21 | 19 | 23 | 23 | 22 | 22 | 21 | 19 | 22 | 20 | 18 | 22 | 21 | 17 |
Swell 1 Height (m) Direction Period (s) | NW 10 | W 8 | NNW 8 | NNW 8 | W 10 | NW 6 | NW 8 | W 9 | W 9 | W 9 | W 7 | W 7 | W 7 | W 7 | W 7 | NW 7 | W 6 | NW 8 | NW 10 | NNW 10 | W 10 |
| kJ | 96 | 28 | 90 | 108 | 49 | 83 | 65 | 26 | 14 | 24 | 39 | 46 | 34 | 33 | 44 | 42 | 12 | 118 | 148 | 125 | 148 |
Swell 2 Height (m) Direction Period (s) | W 8 | WNW 10 | WNW 10 | W 10 | SW 12 | NNW 8 | W 9 | NNW 8 | W 6 | NNW 7 | NNW 7 | NW 11 | NW 10 | NW 9 | NW 9 | W 6 | NW 13 | NW 11 | WNW 10 | W 11 | NNW 10 |
| kJ | 61 | 34 | 33 | 49 | 5 | 24 | 27 | 20 | 7 | 4 | 4 | 30 | 47 | 67 | 61 | 21 | 27 | 64 | 19 | 61 | 83 |
Swell 3 Height (m) Direction Period (s) | WNW 10 | SW 12 | W 7 | SW 12 | — | W 9 | S 13 | S 11 | NW 3 | SW 12 | NW 12 | N 6 | — | — | W 12 | NW 10 | W 11 | W 6 | W 6 | — | — |
| kJ | 20 | 6 | 14 | 6 | — | 28 | 3 | 2 | 2 | 6 | 6 | 1 | — | — | 3 | 47 | 9 | 7 | 2 | — | — |
Wind waves Height (m) Direction Period (s) | — | NW 9 | NNW 6 | — | NNW 8 | — | — | NW 4 | — | — | — | — | — | WNW 2 | — | — | NW 9 | — | — | W 6 | NW 3 |
| kJ | — | 148 | 53 | — | 105 | — | — | 4 | — | — | — | — | — | 1 | — | — | 97 | — | — | 2 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 130 | 0 | 14 | 151 | 0 | 0 | 1172 | 169 | 104 | 104 | 0 | 0 | 111 | 0 | 0 | 130 | 0 | 0 | 100 | 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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