Surf Forecasts:
Viana do Castelo surf forecast from 31 Jul 2026:
- Best quality surf: Saturday 1 Aug, 1AM (local time) - 4.5ft (1.3m), 6s period, NNW swell with offshore winds.
- Most powerful swell: Saturday 8 Aug, 1AM (local time) - 3.5ft (1.1m), 9s period, W swell with 196 kJ wave energy.
- Next surfable swell (1★+): Saturday 1 Aug, 1AM (local time) - 4.5ft (1.3m), 6s 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 Saturday (Aug 01) at 1AM. The primary swell is predicted to be 1.3m and 6s period with a secondary swell of 1.1m and 6s. Another secondary swell of 0.7m and 9s is also forecast. The wind is predicted to be 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 Saturday (Aug 08) at 1AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Wednesday (Aug 05) at 10PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sat 1st Aug) | 4.5ft (1.3m) 6s |
| Best Surf | 1AM (Sat 1st Aug) | 4.5ft (1.3m) 6s |
| Most Powerful | 1AM (Sat 8th Aug) | 3.5ft (1.1m) 9s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Yo, Rusty here. Let's talk about Viana do Castelo for the next couple of weeks. It's a river mouth setup, exposed to the west, and it's a bit of a frustrating run for the most part. We're looking at a long stretch of small, weak swell with a lot of cross-wind and onshore wind, making for pretty ordinary conditions. The water is sitting at 66°F, which is bang on average for this time of year—nothing unusual there.
The first few days are a write-off. Friday the 31st has tiny 1ft waves from the WNW with a moderate cross-offshore, but it's just too small. Saturday the 1st and Sunday the 2nd are a bit of a tease. Sunday morning shows a tiny 2ft swell with glassy conditions, but it's barely breaking. The combined energy is weak (65), so you're not missing much.
We get a bit of a bump in size from Wednesday the 6th, but the wind is messy. Tuesday the 4th morning has a glassy 3ft swell, but it's still weak and the rating is poor. The real hope doesn't show up until Saturday the 8th of August. That morning, we've got a glassy 5ft swell from the west, with a combined energy of 327—that's a solid, moderate energy pulse. The wind is glassy, which is a major positive. The mouth of the river will be the place to be, but keep in mind this spot is fairly consistent, so it can get crowded. This is the standout. The swell is a bit small for a real pumping session, but a clean 5ft on a river mouth with no wind is a wave you can have fun on.
After that, the wind picks up strong again. Tuesday the 12th morning has a clean 4ft swell from the west with a 10-second period, and the energy is solid (343). It's a good-looking window, but the afternoon gets hammered by a 19 mph NNW wind. The long-range forecast for the 14th and 15th is just blown-out, small, and weak. The best bet is to focus on that Saturday the 8th morning window. For the rest, it's a lot of waiting and watching. The consistent swell direction from the west is a good sign, but the wind is the enemy here.
Rusty out.
Short Range ForecastMostly dry. Warm (max 22°C on Sat morning, min 16°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Thu morning, min 18°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Fri 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | ||||||||||||||
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) | WNW 9 | NNW 6 | W 9 | NNW 8 | W 9 | W 9 | W 10 | W 9 | W 9 | W 8 | W 9 | W 9 | W 8 | W 8 | W 8 | NW 8 | NW 8 | NNW 9 | NNW 9 | NNW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 26 | 128 | 73 | 42 | 55 | 41 | 65 | 80 | 99 | 173 | 153 | 120 | 89 | 82 | 55 | 53 | 100 | 106 | 65 | 44 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-on | cross | glassy | glassy | cross | glassy | cross-on | on | glassy | glassy | cross-on | cross-off | cross-off | cross-off | cross-off | cross | cross | glassy |
High Tide | 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 | 8:01AM3.03m | 8:22PM2.99m | 9:00AM2.92m | 9:28PM2.82m | |||||||
Low Tide | 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 | 2:06PM1.03m | 2:36AM1.00m | 3:12PM1.17m | 3:46AM1.14m | |||||||
 |  | | |  |  | | | | | | | | | | | | | | | |
 | — | — | 6:28 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — |
 | 8:54 | — | — | 8:52 | — | — | 8:52 | — | — | 8:51 | — | — | 8:50 | — | — | 8:49 | — | — | 8:47 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 20 | 22 | 22 | 18 | 21 | 21 | 19 | 22 | 23 | 21 | 23 | 23 | 20 | 23 | 22 | 19 | 24 | 23 | 18 |
Feels °C | 19 | 21 | 22 | 22 | 19 | 21 | 20 | 20 | 21 | 23 | 23 | 23 | 23 | 21 | 20 | 18 | 18 | 23 | 22 | 19 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | NW 6 | NW 6 | NNW 8 | NW 7 | W 9 | W 10 | W 9 | W 9 | W 8 | W 9 | W 9 | W 8 | W 8 | W 8 | NW 8 | NW 8 | NNW 9 | NNW 9 | NNW 8 |
| kJ | 26 | 85 | 38 | 40 | 49 | 41 | 65 | 80 | 99 | 173 | 153 | 120 | 89 | 82 | 55 | 53 | 100 | 106 | 65 | 44 |
Swell 2 Height (m) Direction Period (s) | W 11 | W 9 | W 9 | W 9 | W 9 | NW 5 | NNW 7 | NW 7 | NNW 8 | NW 8 | N 8 | NNW 11 | NW 11 | NW 9 | NW 8 | W 7 | W 10 | W 10 | W 10 | WNW 10 |
| kJ | 10 | 83 | 73 | 42 | 55 | 13 | 5 | 13 | 6 | 2 | 1 | 12 | 29 | 21 | 34 | 37 | 71 | 69 | 47 | 31 |
Swell 3 Height (m) Direction Period (s) | NW 9 | NNW 9 | NNW 8 | WSW 8 | SW 8 | WSW 8 | — | — | SW 15 | S 15 | SW 14 | N 9 | SW 13 | SW 13 | WNW 10 | WNW 10 | NNW 11 | SW 12 | SW 12 | W 6 |
| kJ | 3 | 7 | 14 | 22 | 3 | 11 | — | — | 8 | 4 | 7 | 1 | 7 | 7 | 20 | 33 | 12 | 6 | 5 | 6 |
Wind waves Height (m) Direction Period (s) | NW 4 | NNW 6 | — | — | — | — | NW 4 | — | SSE 2 | — | — | — | — | — | — | NW 3 | — | — | NW 2 | — |
| kJ | 18 | 128 | — | — | — | — | 4 | — | 1 | — | — | — | — | — | — | 3 | — | — | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 130 | 0 | 56 | 130 | 0 | 0 | 104 | 0 | 10 | 100 | 0 | 0 | 100 | 0 | 0 | 100 | 0 | 14 | 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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