Kugenuma Rivermouth Surf Forecast and Surf Report

Alright mate, Rusty here again. Let’s break down the Kugenuma Rivermouth surf for the next couple of weeks, but in feet and miles per hour.

To be blunt, it’s a poor outlook. We’re looking at a long stretch of small, weak waves and dodgy conditions, so don’t get your hopes up. The water’s about 81°, which is pretty normal for the season.

The one real bright spot is Sunday morning, August 9th. We’ve got a tiny 2ft SSW swell with a 10-second period, and the combined energy is a weak 151. The wave size is nothing special, but the wind is glassy from the ESE at just 3 mph. That means the surface will be dead flat. It’s surfable, but very ordinary. If you’re learning or just want a paddle, that’s your best bet.

Monday the 10th of August offers a clean morning with a cross-offshore breeze (ENE, 9 mph), but the swell drops to a tiny 2ft. The energy is barely there at 97. The afternoon might give you a glassy 2ft wave, but it’s still weak.

The rest of the first week is a bust. Tuesday the 11th is blown out with onshore winds and rain. Wednesday and Thursday are clean-ish but only 2ft of swell. Friday the 14th morning has fresh offshore winds (NNE, 19 mph) but only 1ft of swell – just not enough.

The standout, if you can call it that, is Saturday the 15th of August. The swell picks up to 2ft from the SE, with a combined energy of 102 (moderate), and we’ve got strong offshore winds from the north at 25 mph. That wind will clean it up, but the report says it’s “hard to paddle into.” It’s going to be a fight to get out there for a tiny wave. Only for the experienced.

After that, it’s a long lull. Sunday the 16th has a glassy, clean window in the afternoon with a gentle offshore (N, 9 mph) and a 2ft ESE swell, but the energy is low. The second week is mostly dead, with waves barely reaching 1ft and the wind either onshore or glassy with no push. The swell period hits 13 seconds on the 16th, but that long period groundswell will just close out a river mouth like this.

So, the only real window is that Sunday morning (August 9th) glassy session. For beginners, that’s the pick. For everyone else, it’s a waiting game. The crowds are listed as “often,” so you won’t be alone even on the small days. There’s a long gap of poor conditions from the 11th to the 14th, and then another gap from the 17th onward. Not much to get excited about.

Rusty.

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