Surf Forecasts:
Viana do Castelo surf forecast from 20 Jul 2026:
- Best quality surf: Monday 27 Jul, 4AM (local time) - 5ft (1.6m), 7s period, NNW swell with offshore winds.
- Most powerful swell: Saturday 25 Jul, 10PM (local time) - 7ft (2.1m), 7s period, NNW swell with 428 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 10PM (local time) - 2ft (0.6m), 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 Monday (Jul 20) at 10PM. The primary swell is predicted to be 0.6m and 8s period with a secondary swell of 0.3m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Viana do Castelo in the next 16 days are 2.1m 7s and forecast to arrive on Saturday (Jul 25) 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 1.5m 6s period and expected on Sunday (Jul 26) at 4PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Mon 20th Jul) | 2ft (0.6m) 8s |
| Best Surf | 4AM (Mon 27th Jul) | 5ft (1.6m) 7s |
| Most Powerful | 10PM (Sat 25th Jul) | 7ft (2.1m) 7s |
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 coming up for Viana do Castelo.
To be straight with you, the next ten days or so are looking pretty flat. We’re looking at a long stretch of small, weak, and mostly messy conditions. The first real sign of life doesn’t show up until late on Saturday the 25th, and even then it’s got its issues.
The standout window is the afternoon of Saturday, 25 July. We’ll see a jump in size with a 7ft swell rolling in from the NW, but it’s short period stuff at 7 seconds, so it’s going to be a bit raw and lumpy. The energy is moderate (368), and the wind is cross-offshore from the NNW at 19 mph, which will keep the surface clean. This is the best on offer, but with that short period and the size, it’s more for experienced surfers. It’s a river mouth break, so it can handle a bit of direction, but this is not a day for beginners.
The next morning, Sunday the 26th, has a cleaner 3ft NW swell with lighter cross-off winds, but the energy drops right off (97), and it’s surfable but very ordinary. The following Monday morning, 27 July, sees a 5ft NW groundswell with a 10-second period and a solid energy reading (452), with clean offshore winds from the north. That’s a promising session, but it’s still a week out, so keep an eye on it. The period is long enough to shape up, but at a river mouth, that longer period can sometimes make it a bit too straight.
Water temp is sitting at 67°, which is just about normal for the time of year, so no surprises there.
The break is Viana do Castelo, a river mouth that’s fairly consistent. It can get crowded often, so don’t expect to have it to yourself.
After that, the rest of the run into early August is a mix of small, weak, and often onshore or side-shore winds. There are a few glassy mornings, like the 31st of July and the 1st of August, but the swell is tiny, under 2ft. You might get a log out for a cruise, but there’s nothing to get excited about.
The bottom line: if you’ve got to pick a day, make it the afternoon of Saturday the 25th for the biggest push, or the morning of Monday the 27th for the best quality. Everything else is a long wait for not much.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Mon afternoon, min 16°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Thu afternoon, min 15°C on Sat night). Winds increasing (calm on Fri night, fresh winds from the NNW by Sat afternoon). | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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 7 | NNW 7 | NNW 8 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | NW 8 | NW 7 | NNW 7 | NNW 7 | WSW 6 | W 7 | NW 7 | NNW 7 | NW 13 | NW 12 | NNW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 51 | 48 | 42 | 20 | 33 | 33 | 19 | 18 | 16 | 16 | 16 | 15 | 10 | 9 | 70 | 114 | 327 | 247 | 25 | 67 | 299 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross | glassy | cross | glassy | on | cross-on | glassy | cross-on | on | cross | cross-on | on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:23PM2.95m | 9:00AM2.76m | 9:14PM2.74m | 9:56AM2.64m | 10:14PM2.57m | 11:01AM2.58m | 11:26PM2.48m | 12:10PM2.60m | 00:40AM2.49m | 1:11PM2.69m | 1:41AM2.56m | 2:01PM2.82m | 2:28AM2.68m | ||||||||
Low Tide | 2:06PM1.16m | 2:39AM1.09m | 2:59PM1.33m | 3:32AM1.26m | 4:03PM1.46m | 4:34AM1.39m | 5:18PM1.51m | 5:42AM1.44m | 6:32PM1.46m | 6:46AM1.41m | 7:30PM1.35m | 7:38AM1.32m | 8:17PM1.21m | ||||||||
 |  |  | | | | | | | | | | | |  | | | | | | | |
 | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — |
 | — | — | 9:05 | — | — | 9:04 | — | — | 9:02 | — | — | 9:01 | — | — | 9:00 | — | — | 9:00 | — | — | 9:00 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 23 | 19 | 23 | 21 | 18 | 22 | 22 | 18 | 21 | 22 | 19 | 22 | 21 | 20 | 22 | 21 | 17 | 26 | 24 | 23 |
Feels °C | 21 | 23 | 22 | 23 | 21 | 19 | 22 | 22 | 19 | 21 | 22 | 21 | 20 | 20 | 20 | 20 | 17 | 13 | 21 | 20 | 20 |
Swell 1 Height (m) Direction Period (s) | NW 7 | NNW 7 | NNW 8 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NW 8 | NW 7 | NNW 7 | NNW 7 | WSW 6 | W 7 | — | NW 14 | NW 13 | NW 12 | NNW 11 |
| kJ | 51 | 48 | 42 | 17 | 17 | 15 | 14 | 15 | 15 | 16 | 14 | 14 | 10 | 9 | 70 | 114 | — | 8 | 25 | 67 | 79 |
Swell 2 Height (m) Direction Period (s) | W 8 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 8 | WNW 8 | NNW 6 | W 11 | — | — | WNW 9 | WNW 9 | — |
| kJ | 12 | 12 | 23 | 20 | 33 | 33 | 19 | 18 | 16 | 16 | 16 | 15 | 7 | 7 | 4 | 2 | — | — | 17 | 16 | — |
Swell 3 Height (m) Direction Period (s) | WNW 12 | W 8 | W 7 | WSW 7 | N 8 | N 9 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 12 | SW 4 | SW 11 | S 11 | S 12 | — | — | WNW 7 | — | — |
| kJ | 15 | 10 | 4 | 5 | 6 | 7 | 8 | 8 | 7 | 7 | 7 | 6 | 1 | 5 | 2 | 3 | — | — | 5 | — | — |
Wind waves Height (m) Direction Period (s) | — | SSW 3 | — | — | — | — | — | — | — | — | — | — | SSE 3 | SW 4 | — | N 6 | NW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 7 |
| kJ | — | 2 | — | — | — | — | — | — | — | — | — | — | 1 | 4 | — | 3 | 327 | 247 | 103 | 144 | 299 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 258 | 5 | 0 | 182 | 0 | 19 | 146 | 179 | 182 | 168 | 168 | 1164 | 106 | 0 | 0 | 205 | 182 | 19 | 100 | 18 |
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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