Viana do Castelo Surf Forecast and Surf Report

Alright, Rusty here. Let’s talk about what’s shaping up for the waves at Viana do Castelo. This is a river mouth setup that needs the right conditions to really fire, and we’ve got a mixed bag over the next couple of weeks.

We start off on Sunday, August 23rd morning with a glimmer of hope. There’s a clean 5ft swell from the west with a 10-second period and a light north breeze blowing cross-offshore. The water’s about average for the time of year, and with combined swell energy at 529, it’s moderate. It’s a decent little window, but don’t get too excited—crowds are often here, and the river mouth can be fickle. This is the standout of the early period, but it’s fleeting.

After that, things go flat and ugly. From Sunday afternoon all the way through Thursday, August 27th, the wind’s onshore or cross-shore from the south and southwest, the swell drops, and the period gets short. It’s a poor run of surf, with energy values ranging from 90 to 538. Thursday afternoon is marginal at best with a 6ft west swell but onshore wind.

Then we get a big, powerful pulse. On Friday, August 28th, a strong groundswell from the west-northwest hits with an 8ft swell and an 11-second period. The energy jumps to a massive 1597. But here’s the catch: this is a river break, and 8ft is too big for it. The wind is light, but the wave height will be closing out and messy. Only for experts, and even then, it’s a risk. Friday afternoon is the same story—8ft from the northwest.

Saturday, August 29th morning is another small window of quality. A clean 5ft northwest swell with glassy conditions and zero wind. The energy’s moderate at 430. This could be a nice session if you time it right, but the afternoon gets a cross-shore breeze and drops off.

From there, we hit a long dry spell. Sunday, August 30th through Wednesday, September 2nd is mostly small, weak, and onshore or glassy but tiny. Energy values are below 200. The waves are surfable but nothing to write home about. Thursday and Friday, September 3rd and 4th are mostly tiny and weak, with a bit of cross-offshore wind but barely a ripple.

The tail end of the forecast shows a small uptick. On Monday, September 7th morning, there’s a 5ft west-northwest swell with a light cross-offshore breeze from the north-northwest, giving clean conditions. The period is a weak 9 seconds, but it’s the best we’ve seen in a week. It’s still marginal for the break.

So, to wrap it up: Sunday morning August 23rd and Saturday morning August 29th are your best bets for a clean, fun session at Viana do Castelo. The big swell on August 28th is too much for this spot. After that, it’s a long wait until September 7th for another chance. Keep an eye on the forecasts, but for now, it’s mostly a waiting game.

Rusty.

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