Sandy Mouth Surf Forecast and Surf Report

Alright folks, Rusty here. Let’s break down what’s on the table for this North Cornwall stretch. I’m looking at Sandy Mouth and, honestly, we’ve got a tough start. The first few days are a bit of a write-off for quality. The water is a balmy 66°, which is much warmer than normal for this time of year – a real treat if you can get in, but the waves aren’t cooperating yet.

The situation starts on the 1st of September. We’ve got a 3ft west swell, but it’s coming in with a cross-onshore wind around 16 mph and it’s just messy. The wave energy is weak at 129. That continues into Wednesday the 2nd. Thursday the 3rd and Friday the 4th see the swell bump up to 5-5ft from the west, with moderate cross-onshore winds. The energy picks up into the 200s and 300s, but it stays chopped and lumpy. Not worth paddling out for the sake of a proper wave.

We finally get a shift on Saturday morning, the 5th. The wind goes light onshore and then glassy — 3 mph from the WNW and clean. You’ve got a 3ft west swell with a 10-second period, giving moderate energy (191). It’s surfable, but the conditions are still described as poor. It’s the best of a bad run, but don’t expect perfection. The next day, Sunday the 6th, drops right off to a tiny 2ft.

Here’s where things get interesting. Come Monday, the 7th of September, we see a spike in energy. The swell hits 6ft from the west with a 13-second period, and the combined energy rockets up to 1200. That’s a lot of juice. The wind is a light cross-onshore. The catch? It’s still a bit chunky and messy, and the tide may be playing tricks. This isn’t a beginner wave. At 6ft and that power, it’s pushing towards expert territory. It’s the best on offer in the whole window, but you’ve got to wait a week.

After that surge, the following week is a mixed bag. Tuesday the 8th gets hammered by fresh wind again. Wednesday the 9th is strong and messy. Thursday the 10th is small again. The real standout shows up on Friday the 11th. A 3ft west swell with a clean morning. By the afternoon, the wind turns offshore from the east at 9 mph. That’s clean, glassy face potential. It’s only a 1/5 on the quality scale, but for the area in this window, that’s a good session. The energy is low (176), but the waves will be clean and user-friendly.

After that, the 12th and 13th are tiny and clean but too small to really ride. The 14th pushes back up to 4ft from the west with a 9-second period, and offshore winds from the east-southeast at 16-19 mph. That’s a cleaner option, but still not firing.

The final few days, the 15th and 16th, see the swell holding around 5-5ft but the winds turn cross-onshore again, killing the quality. There’s just too much chop to make it a standout.

The Takeaway: Saturday the 5th is the early clean-up cruise if you’re desperate. But the real standout is Monday the 7th – it’s a powerful, long-period groundswell, but only for experienced surfers in the know. Friday the 11th and Monday the 14th offer the cleanest windows for a manageable, smaller wave. The rest is a slog.

Rusty.

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