Kugenuma Rivermouth Surf Forecast and Surf Report

Alright folks, let's be real here. For the next week plus, it's flat and grim. We've got a long stretch of nothing, from the 10th through the 18th, with tiny dribbles of swell and sloppy conditions. You might as well find something else to do.

First up, we've got the Rivermouth at Kugenuma (Shonan). The water's at 82°, which is a touch warmer than usual for this time of year. On Wednesday the 10th, there’s a small, weak pulse of south swell. We're talking about 3ft with an 8-second period, and the energy is weak. The wind will be offshore from the NE at 16 mph, so it’ll be clean, but there’s just no power in it. Not worth the paddle.

From the 11th through the 18th, things just fade to nothing. The swell is dropping below 2ft. There are some clean, offshore mornings, but with no waves, it doesn't matter. It's a dead zone.

Then, things get interesting. Mark your calendar for Saturday the 19th. We finally get proper energy. Saturday morning is looking at a 7ft SSE groundswell with a 16-second period. The energy is strong. Conditions are excellent for experienced surfers. The wind is a moderate offshore from the NNE at 12 mph. This is the standout of the period. The afternoon on the 19th kicks it up a notch: 7ft of SSE swell, 15-second period, and even more energy. Winds ease a bit to a gentle 9 mph offshore from the NE. Only for the experienced crew.

Sunday the 20th keeps the run going with more solid 6-7ft south groundswell, with a period around 14-15 seconds. The energy is strong, and by the afternoon it’s glassy, dead calm. This is another top pick.

Now, Monday the 21st is a massive swell event. The forecast is for a huge 23ft SSW groundswell with a period of 15 seconds during the morning and an insane energy reading. But this is too big for this break. It's going to be a total closeout and completely unsurfable here. The afternoon drops to 12ft, but that’s still way too big and unruly for the river mouth. That’s for another kind of wave, not here.

After that big pulse, it fades out quickly. Tuesday the 22nd drops to a marginal 4ft south swell with a 9-second period, and a light cross-onshore wind. It’s a step-down. By mid-week it’s back to small and onshore junk.

So, the standout is clearly the 19th and 20th. Clean, powerful, and consistent. That’s the window, if you've got the skill. Everything before is a write-off. And the 21st looks mental, but not for us here. Keep an eye on it, as this long-range call is promising but not locked in yet.

Rusty.

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