Sagami River Surf Forecast and Surf Report

Alright, it’s Rusty here, and I’ve gotta be straight with you—this is a tough stretch for the Kanagawa coast. The only break on the radar is Sagami River, and for the first week-plus, it’s just not happening. The whole run from Monday the 31st of August right through to the morning of Monday the 7th of September is a total write-off. We’re looking at tiny swell, weak energy (often under 100 in the combined energy), and the conditions are poor across the board. There’s a big gap of no surf worth mentioning until we get a glimmer.

Come Monday the 7th of September, things start to stir. The morning shows a bump in combined swell energy (118) and clean conditions with a light cross-off breeze from the north. The swell is still small, 2 ft from the southeast, but it’s the first sign of life. The real standout is Monday afternoon: glassy conditions, easterly wind at just 3 mph, and the swell picks up to 2 ft from the south with a longer period of 12 seconds and combined energy jumping to 244. It’s not big, but it’s clean and the longest period we’ve seen so far. That’s your best window early on.

From there, the swell builds through the week, but the wind and conditions keep letting us down. By Wednesday the 9th of September, the morning has 4 ft swell from the south-southeast at 11 seconds and 336 combined energy, and it’s clean with a cross-off breeze. But the quality is still poor—the wave comment says “poor surf conditions” and the score is zero. It’s frustrating. Friday the 11th of September sees a big jump in combined energy to 1361 and swell at 6 ft, but the wind is strong from the south-southeast at 28 mph and the surf is messy. The break is a beach/jetty setup, so with that much wind and chop, it’s honestly more interesting for kite surfing than paddling.

Then, the real standout in the whole outlook is Tuesday the 15th of September. The morning delivers 13 ft swell from the south-southeast at a solid 13 seconds, with combined energy shooting up to 5491—that’s very strong. Wind is a clean cross-off from the northeast at 9 mph, and conditions are clean. The problem? It’s just too big for this break. The file says the swell is predicted to be too big, so it’s expert-only territory, and even then, with that much energy, it might be a beast. The optimum swell direction is from the southeast, and this is coming in from the south-southeast, so it’s in the right ballpark, but the size is the limiting factor. If you’re a charger, this is your day, but it’s a long-range call and less certain.

Water temperature is about average for the time of year, no big anomaly to report. So, overall, Monday afternoon the 7th of September is the most accessible standout for clean, small waves. If you’re after power, Tuesday the 15th of September is the one to watch, but only for the brave.

Rusty.

Read more