Kugenuma Rivermouth Surf Forecast and Surf Report

Alright folks, Rusty here. Let’s talk about what’s cookin’ at Kugenuma Rivermouth (Japan) over the next couple of weeks.

First up, the bad news: the next week or so is pretty much dead. From Sunday the 19th right through to Tuesday the 27th, we’re looking at flat to tiny waves – mostly under 2ft, weak short-period windswell, and a lot of onshore chop. You’d be better off waxing your board and staring at the ceiling. Water temp is sitting around 79°, which is about average for this time of year, so no worries there.

Now, there’s a glimmer of hope on Tuesday the 28th. The morning session is where it’s at. We’ve got a solid 3ft SSW groundswell rolling in with a 15-second period – that’s proper long-period energy with some punch. The combined energy reads 580, so moderate but decent. What makes it special is the wind: light NE breeze blowing offshore, keeping the surface glassy and clean. The river mouth setup should handle that long-period swell nicely, offering some nice shaped waves. It’s a beginner-friendly spot, and with 3ft it’s perfect for all levels. Just keep in mind this break can get crowded – often has a crew, so get there early.

That Tuesday morning is the standout, no doubt. By afternoon the wind swings onshore and the quality drops. The rest of the week after that? Onshore winds, messy chop, and waves that are either too weak or too blown out. Wednesday the 29th morning shows 5ft but with onshore wind – that’s a mushy, blown-out mess, only for the hardcore. Thursday and Friday are similar, with onshore winds cranking up to 20–25 mph.

So in short: one clear winner – Tuesday 28th morning. If you can’t make that, you’re probably looking at a long wait. The forecast holds no other good options in the 16-day window. But hey, it’s a fairly consistent break, so it won’t stay flat forever. Keep an eye on the charts.

– Rusty

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