Surf Forecasts:
Viana do Castelo surf forecast from 9 Jul 2026:
- Best quality surf: Thursday 9 Jul, 10PM (local time) - 2.5ft (0.7m), 9s period, WNW swell with cross-offshore winds.
- Most powerful swell: Sunday 12 Jul, 7AM (local time) - 3ft (0.9m), 9s period, WNW swell with 119 kJ wave energy.
- Next surfable swell (1★+): Thursday 9 Jul, 10PM (local time) - 2.5ft (0.7m), 9s period with WNW 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 Thursday (Jul 09) at 10PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.1m and 16s. Another secondary swell of 0.4m and 5s is also forecast. 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 0.9m 9s and forecast to arrive on Sunday (Jul 12) at 7AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 5s period and expected on Friday (Jul 10) at 4PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Thu 9th Jul) | 2.5ft (0.7m) 9s |
| Best Surf | 10PM (Thu 9th Jul) | 2.5ft (0.7m) 9s |
| Most Powerful | 7AM (Sun 12th Jul) | 3ft (0.9m) 9s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
Alright, let’s break this down in feet and degrees. For Viana do Castelo (Portugal), it’s a long stretch of small, messy surf. This river mouth needs a clean west swell and northeast offshore wind to fire, and we’re just not seeing that for most of the 16 days.
Thursday morning the 9th of July is glassy with light west wind, waves around 2ft from WNW, 9-second period. Energy is weak at 90. It’s surfable but very ordinary. Afternoon turns cross and choppy.
Friday morning the 10th of July—similar: 3ft, glassy, light WNW wind, energy 106. Small and clean but nothing special. Afternoon gets messy again.
Saturday the 11th and Sunday the 12th are mostly onshore and cross-onshore—not worth it, even though Saturday has a longer 11-second period swell.
Monday the 13th drops to tiny 1ft and 0.7ft—don’t bother.
Tuesday the 14th morning is glassy but only 1ft with a long 11-second period, energy 83. Too small.
From Wednesday the 15th through to Tuesday the 22nd of July, swell sizes run from 2ft to 4ft, but periods are short (6–8 seconds) and winds are mostly cross-offshore—clean sometimes, but the energy stays low to moderate (43 to 185). The river mouth won’t have any real push.
The one and only standout is Thursday morning the 23rd of July. We get a 5ft swell from NNW, 7-second period, and the combined energy jumps to 206—the best of the whole run. Winds are light cross-offshore from NNE, keeping the surface clean. It’s the best window by far. Get out early, because afternoon winds crank up to 35 km/h from NNW and ruin it.
Friday the 24th morning is also clean with 4ft from NNW, energy 191, but not quite as good.
Water temp is about 61°, which is nearly 4° cooler than normal for July—so you’ll want a thicker wetsuit.
It’s a lean few weeks, but that Thursday the 23rd morning is your real shot.
Keep checking back.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sat morning, min 14°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Sun morning, min 16°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | |||||||||||||||
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) | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 8 | NW 11 | NW 10 | NW 10 | WNW 9 | NW 8 | NW 8 | NW 8 | NNW 8 | W 7 | WNW 11 | W 6 | WNW 10 | WNW 9 | W 6 | WSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 75 | 75 | 73 | 90 | 88 | 59 | 92 | 80 | 73 | 94 | 86 | 53 | 18 | 7 | 34 | 40 | 38 | 31 | 27 | 51 | 77 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | cross-off | glassy | cross | cross-off | cross-on | cross-on | cross-on | cross-on | on | glassy | cross-on | on | glassy | glassy | cross-on | glassy | cross-on | on | cross |
High Tide | 10:44AM2.91m | 11:11PM2.87m | 11:56AM3.00m | 00:26AM2.91m | 1:05PM3.14m | 1:37AM3.02m | 2:07PM3.31m | 2:38AM3.15m | 3:03PM3.47m | 3:34AM3.27m | 3:54PM3.58m | 4:24AM3.34m | 4:42PM3.63m | ||||||||
Low Tide | 5:00PM1.16m | 5:32AM1.02m | 6:16PM1.07m | 6:42AM0.94m | 7:25PM0.91m | 7:45AM0.82m | 8:25PM0.73m | 8:42AM0.70m | 9:19PM0.57m | 9:33AM0.61m | 10:09PM0.46m | 10:22AM0.57m | 10:56PM0.42m | ||||||||
 | |  | | |  |  | | | | | | | | |  | | | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — |
 | — | — | 9:10 | — | — | 9:10 | — | — | 9:09 | — | — | 9:09 | — | — | 9:08 | — | — | 9:08 | — | — | 9:07 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 19 | 16 | 20 | 20 | 17 | 21 | 20 | 18 | 21 | 21 | 18 | 20 | 21 | 18 | 21 | 21 | 19 | 21 | 21 | 19 |
Feels °C | 20 | 18 | 16 | 20 | 20 | 17 | 21 | 20 | 20 | 20 | 20 | 20 | 19 | 20 | 20 | 21 | 21 | 20 | 19 | 20 | 19 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 8 | NW 11 | NW 10 | NW 10 | WNW 9 | NW 8 | NW 8 | NW 8 | W 5 | W 7 | W 6 | W 6 | W 6 | W 6 | W 6 | WSW 7 |
| kJ | 75 | 75 | 73 | 90 | 88 | 59 | 92 | 80 | 73 | 94 | 86 | 53 | 18 | 5 | 34 | 38 | 38 | 28 | 27 | 51 | 77 |
Swell 2 Height (m) Direction Period (s) | NW 5 | S 17 | NW 5 | NW 5 | NW 13 | NW 12 | WNW 9 | W 9 | W 9 | SW 15 | WSW 7 | WSW 7 | WNW 8 | NNW 8 | WNW 12 | WNW 11 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | W 8 |
| kJ | 15 | 6 | 6 | 5 | 7 | 50 | 44 | 56 | 56 | 8 | 9 | 15 | 11 | 7 | 14 | 40 | 34 | 31 | 26 | 25 | 12 |
Swell 3 Height (m) Direction Period (s) | — | — | SW 16 | SW 17 | SW 17 | SW 17 | NW 4 | SW 16 | NW 4 | S 21 | SW 19 | WNW 8 | SW 6 | WNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | SW 14 | SW 15 | W 10 |
| kJ | — | — | 10 | 11 | 11 | 11 | 2 | 10 | 2 | 8 | 15 | 13 | 8 | 6 | 6 | 5 | 5 | 4 | 8 | 8 | 8 |
Wind waves Height (m) Direction Period (s) | — | NW 5 | NW 5 | — | NW 5 | NW 3 | — | NW 4 | — | — | SSW 3 | — | — | SW 4 | — | — | — | — | S 2 | S 3 | — |
| kJ | — | 8 | 8 | — | 7 | 4 | — | 3 | — | — | 1 | — | — | 3 | — | — | — | — | 1 | 3 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 100 | 0 | 0 | 100 | 0 | 2 | 100 | 38 | 18 | 146 | 0 | 260 | 106 | 0 | 0 | 100 | 0 | 104 | 104 | 2 |
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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