Kugenuma Rivermouth Surf Forecast and Surf Report

Alright folks, Rusty here. Let’s get into it for Kugenuma Rivermouth. We’ve got a solid pulse of swell coming through this week, but you’ve got to pick your moments. The water is sitting at 83°, which is a touch warmer than normal for this time of year – feels like bathwater, so don’t bother with a thick wetsuit.

The action kicks off Monday morning, but it’s really just a tease. You’ll see some 2ft swell from the SE with a very long 16-second period, but the energy is weak (277) and the report says it’s marginal. The wind is a moderate offshore breeze from the NNE, which is clean, but the swell just isn’t there yet. Monday afternoon is similar, with 3ft and a bit more energy (449), but still not worth paddling out for.

Tuesday morning is where it starts to get interesting. The swell pushes up to 5ft from the SE, period still a long 17 seconds, and the energy jumps to a solid moderate (1138). The wind is a fresh offshore from the NNE, so it’ll be clean. The score is still holding back, but you can feel it building. Tuesday afternoon sees the swell hit 6ft, and the energy is now strong (1614), but the wind swings to a cross-off from the ENE, making it a bit less perfect.

Now, Wednesday morning is the real standout. The swell is a solid 8ft from the SSE, with a long 16-second period, and the energy is pumping (3731). The wind is a fresh offshore from the NNE, so it’s going to be clean and powerful. This is big, well overhead surf, so it’s for experienced surfers only. The afternoon is nearly as good, with the same 8ft swell and energy (3569), but the wind drops to a moderate offshore from the NE, making for excellent conditions. This is the best session on offer.

Thursday morning holds the 8ft from the S with a 15-second period and strong energy (3167). The wind is moderate offshore from the NE, so it’s still clean. Afternoon sees the wind go cross-shore from the ESE, which brings a bit of chop, so aim for the morning.

Friday morning is another good call with 8ft from the S and a long 16-second period, and the wind is light offshore from the NE. Clean, powerful, expert-only waves. The energy is still strong (3556). Friday afternoon is a write-off with thunderstorms and onshore wind.

Saturday morning is still decent, with 6ft from the S, a 14-second period, and light cross-off wind from the E. It’s a bit smaller and the energy is moderate (1819), but it’s clean and surfable for stronger intermediates. The afternoon gets messy.

From Sunday, the swell drops fast. Sunday morning has 3ft from the S, and by Monday it’s down to 2ft. The energy is weak (198) and it’s a fresh offshore, so it’s clean but tiny. After that, we hit a long flat spell. From the 10th of August through to the 18th, the swell stays under 3ft, with energy readings mostly below 150. It’s a proper lull. The wind is often offshore or cross-off, but with no swell, there’s nothing to ride. You’ll see a tiny bump of 2ft on the 17th, but the period drops to 8 seconds, which is just wind chop.

So, the standout is undoubtedly Wednesday, August 5th, and Thursday morning, August 6th. That’s when Kugenuma Rivermouth will be pumping with a solid 8ft groundswell from the SSE, offshore winds, and strong energy. It’s a rivermouth, so that long period swell will find a nice line. Just be aware, it’s only for the experienced crew. The rest of the window is either building or fading.

Rusty.

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