Surf Forecasts:
Viana do Castelo surf forecast from 9 Sep 2026:
- Best quality surf: Thursday 10 Sep, 4AM (local time) - 4.5ft (1.4m), 11s period, NNW swell with cross-offshore winds.
- Most powerful swell: Sunday 13 Sep, 1PM (local time) - 5ft (1.5m), 12s period, NW swell with 614 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 4AM (local time) - 4.5ft (1.4m), 11s 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 Thursday (Sep 10) at 4AM. The primary swell is predicted to be 1.4m and 11s period with a secondary swell of 0.5m and 8s. Another secondary swell of 1.3m and 7s 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 1.5m 12s and forecast to arrive on Sunday (Sep 13) at 1PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Tuesday (Sep 15) at 10PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Thu 10th Sep) | 4.5ft (1.4m) 11s |
| Best Surf | 4AM (Thu 10th Sep) | 4.5ft (1.4m) 11s |
| Most Powerful | 1PM (Sun 13th Sep) | 5ft (1.5m) 12s |
Table - best surf conditions forecast for Viana do Castelo over the next 16 days.
The Lowdown
Alright folks, Rusty here, looking at what we’ve got coming down the line for the next couple of weeks. It’s a bit of a slow burn to start, but there’s some real quality brewing if you’re patient.
The opening few days are pretty ordinary. Wednesday morning kicks off with a clean 4.3ft swell from the NNW, but it’s short-period and the energy is weak (376). The N wind is a cross-off, so it’s not a total write-off, but it’s not gonna get the heart pumping. Thursday morning is a step up with a cleaner 4.3ft from the NNW again, period stretching to 10 seconds and a light N breeze. It’s surfable, but nothing to write home about. Friday and Saturday are small and weak, with Saturday morning offering a glassy 2.3ft from the WNW, but it’s just a ripple.
Now, hold on to your leashes, because Sunday the 13th is where it starts to get interesting. Sunday morning glassy with a 4.6ft groundswell from the NW, a 12-second period, and moderate energy (605). That’s the kind of morning that makes you skip breakfast. The afternoon holds the same quality with a light NW cross-off.
Monday the 14th is dead calm in the morning, glassy as a lake, with a clean 3.0ft from the NW. It’s small but clean. The real standout, though, is looking like Thursday the 17th. Thursday morning has a solid 5.2ft from the NW with an 11-second period and strong energy (601) with a gentle N breeze. That’s the best of the first week by a long shot.
The second week is a mixed bag. The 20th of September has a 7.2ft NW swell in the afternoon, but that’s too big for this spot, so it’s a miss. The big one to circle is the 22nd of September. Tuesday morning is glassy with a 4.6ft NW groundswell at a juicy 12 seconds and moderate energy (584). Tuesday afternoon keeps it pumping with a 6.2ft NW swell, 11-second period, and strong energy (924) with a clean cross-off breeze. That’s the pick of the entire forecast period.
The last few days from the 23rd get messy with cross-on winds, so it’s a fade-out.
The water temp is sitting at 65.7°F, which is basically bang on average for this time of year, so no need to dig out the 5/4 just yet.
If you’re looking to score, your best bet is the morning of the 22nd for that glassy, long-period groundswell. The 17th is a close second. Don’t get too excited about the 20th – that swell is just too much muscle for the break.
Stay frothy, see you in the water.
Short Range ForecastMostly dry. Warm (max 28°C on Sat morning, min 16°C on Wed night). Winds decreasing (fresh winds from the NNW on Wed afternoon, calm by Sat morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 32°C on Sun morning, min 19°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Wed 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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) | NNW 10 | NNW 11 | NNW 10 | NNW 10 | NNW 9 | NW 9 | NW 8 | NW 6 | WNW 10 | WNW 9 | NW 14 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 10 | NNW 9 | WNW 11 | NNW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 554 | 595 | 333 | 241 | 73 | 62 | 69 | 113 | 98 | 90 | 221 | 574 | 551 | 389 | 220 | 134 | 115 | 54 | 48 | 241 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | glassy | cross-off | off | glassy | cross-off | glassy | glassy | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 3:11AM3.31m | 3:25PM3.54m | 3:49AM3.42m | 4:02PM3.59m | 4:25AM3.46m | 4:37PM3.56m | 4:58AM3.43m | 5:10PM3.47m | 5:30AM3.34m | 5:42PM3.31m | 6:01AM3.21m | 6:15PM3.11m | ||||||||
Low Tide | 8:57PM0.56m | 9:10AM0.64m | 9:36PM0.45m | 9:48AM0.55m | 10:11PM0.41m | 10:23AM0.53m | 10:44PM0.45m | 10:56AM0.58m | 11:16PM0.55m | 11:29AM0.69m | 11:46PM0.70m | 12:02PM0.84m | 00:17AM0.90m | |||||||
 |  | | |  | | | | | | | | | | | | | | | | |
 | — | — | 7:09 | — | — | 7:09 | — | — | 7:11 | — | — | 7:11 | — | — | 7:13 | — | — | 7:13 | — | — |
 | 7:55 | — | — | 7:53 | — | — | 7:52 | — | — | 7:51 | — | — | 7:49 | — | — | 7:46 | — | — | 7:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 19 | 20 | 20 | 18 | 24 | 25 | 24 | 28 | 29 | 27 | 32 | 30 | 27 | 29 | 27 | 22 | 22 | 21 | 18 |
Feels °C | 16 | 16 | 18 | 17 | 15 | 21 | 22 | 24 | 27 | 27 | 26 | 31 | 28 | 26 | 27 | 26 | 22 | 21 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | WNW 8 | NNW 11 | NNW 10 | NNW 10 | NNW 9 | NW 9 | NW 8 | NW 6 | WNW 10 | WNW 9 | NW 10 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 10 | NNW 9 | WNW 11 | WNW 10 |
| kJ | 53 | 595 | 333 | 241 | 73 | 62 | 69 | 113 | 98 | 90 | 130 | 574 | 551 | 389 | 220 | 134 | 115 | 54 | 48 | 118 |
Swell 2 Height (m) Direction Period (s) | — | W 8 | W 8 | W 8 | W 7 | NNW 9 | W 7 | — | NW 7 | NNW 9 | NW 14 | W 9 | SW 12 | S 12 | WNW 9 | WNW 9 | W 8 | W 8 | WNW 8 | N 13 |
| kJ | — | 33 | 20 | 10 | 9 | 16 | 4 | — | 54 | 53 | 221 | 25 | 6 | 3 | 64 | 62 | 34 | 33 | 21 | 3 |
Swell 3 Height (m) Direction Period (s) | — | NW 10 | W 11 | W 11 | W 10 | W 7 | SW 15 | — | SW 13 | NW 16 | W 8 | SW 12 | — | — | — | S 11 | W 13 | WNW 12 | — | — |
| kJ | — | 16 | 10 | 9 | 7 | 8 | 8 | — | 7 | 41 | 50 | 6 | — | — | — | 2 | 3 | 14 | — | — |
Wind waves Height (m) Direction Period (s) | NNW 10 | NW 8 | — | — | NNW 6 | NNW 4 | NW 5 | — | — | NNW 7 | — | — | — | — | — | — | NW 2 | NW 3 | NW 4 | NNW 6 |
| kJ | 554 | 276 | — | — | 84 | 12 | 32 | — | — | 36 | — | — | — | — | — | — | 1 | 1 | 52 | 241 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 19 | 130 | 5 | 0 | 151 | 19 | 0 | 100 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 120 |
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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