Viana do Castelo Surf Forecast and Surf Report

Right, grab a coffee, let’s talk about the next couple of weeks at Viana do Castelo. It’s a river mouth setup down there, exposed to the west, pretty consistent overall but the first few days are gonna be a write-off. We’ve got a bit of a slow start, but things shape up from Thursday the 20th with some cleaner conditions.

The water temp is sitting around 65°F, which is about normal for this time of year—feels pretty average, no surprises there.

Alright, so Tuesday the 18th and Wednesday the 19th, forget it. Tiny, weak swell under 3 ft with short periods and onshore or cross-on winds. The energy readings are pathetic—just 85 and 61 for those afternoons. Total dud.

Thursday morning the 20th is where it starts getting interesting. Clear skies, light NNW cross-offshore breeze, and a jump in swell to 5 ft from the NW (7 seconds). That cross-off wind is gonna keep it clean, and the energy sits at 287 (moderate). It’s not huge, but it’s the first decent window. The short period (7s) means it’ll be a bit bumpy and won’t have much push, but for a river mouth, it’ll be fun on the inside banks. This is one of the better calls in the near term.

Thursday afternoon, the wind cranks up to 19 mph from the NNW – still cross-off, but that fresh breeze will mess with the surface. Swell up to 6 ft, energy jumps to 373, but it won’t be clean enough to recommend.

Friday the 21st morning, we’ve got a proper pulse. Swell 6 ft from the NW, period stretching to 10 seconds, and the energy is a strong 1201. That’s proper groundswell energy. Wind is moderate from the north, cross-off, so it’s clean. The longer period (10s) means better shaped waves, decent gaps between sets. This morning window is easily the standout of the whole outlook – solid size, clean conditions, proper juice. The afternoon dials back with stronger wind (22 mph) but still cross-off – energy drops to 722 but it’s a bit blown out.

Saturday the 22nd morning holds 5 ft from the NNW (9s) with gentle cross-off wind, energy 418 – clean but a step down in size. Afternoon gets messy with 19 mph wind.

Sunday the 23rd morning, another clean session with 5 ft from the NNW (7s) and light NNE breeze, energy 223 – good for a paddle, not a standout but a solid option. Afternoon winds freshen again.

Monday the 24th morning is small at 3 ft and weak energy (112) – barely worth it. Afternoon drops off.

From the 25th to the 26th, it’s mostly poor again – tiny swell, short periods, cross-onshore junk. The afternoon of the 26th has 7 ft from the NW but with cross-on wind (light, but still) and energy 458 – that’s big for that river mouth, over 8 ft means experts only, and the onshore wind will make it messy.

Now, the second week, from Thursday the 27th onward, we see a more consistent pattern of NW groundswell at 4 ft to 5 ft, periods around 9 seconds, and mostly cross-off winds in the mornings. The Thursday 27th morning is clean with 4 ft (energy 299), Friday 28th morning is clean at 4 ft (271), Saturday 29th morning a touch bigger at 5 ft (365) but that’s borderline for beginners – still clean though. Sunday the 30th morning is your best bet in that week: 5 ft from the NW, 9 seconds, light north wind cross-off, energy 294, clean conditions. After that, Monday the 31st and Tuesday 1st September mornings are compromised by light cross-on winds, so not as good.

Overall, your top windows are Thursday 20th morning for the first cleaner session, and Friday 21st morning for the biggest, best shaped, most energetic swell of the whole 16 days. After that, mornings from the 27th through the 30th are consistent but nothing special. If you’re a beginner, watch out for anything over 5 ft – that’s the limit for comfortable paddling. Over 8 ft (like the 26th afternoon) is expert only.

The river mouth can get a crowd when it’s good, especially when the ocean’s flat elsewhere – and it’s “often” crowded here, so bring your patience.

Keep an eye on the long-range stuff – the 30th morning is a solid bet but it’s still a week and a half out, so treat it as promising, not a lock.

Rusty.

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