Hanamizu River Surf Forecast and Surf Report

Alright, let’s break it down for Hanamizu River. The next 16 days are a real rollercoaster, with a lot of flat, weak stuff early on, and a couple of big pulses later. Water temp is about 82°F, which is normal for the season.

The first week, from Wednesday, September 2nd right through the 8th, is a total dud. Swell is tiny, mostly under 2 feet, coming from the SSW or S, with short periods. The combined energy is low, typically under 100 (19-94). Winds are cross or cross-off, but there’s just no wave to ride. A real slow start.

Then on Wednesday, September 9th, the swell jumps to 6 feet from the S, with a 12-second period. The energy is 798 (moderate). The wind is a fresh cross-onshore, so it’s lumpy. The afternoon sees 8 feet from the S, with a 13-second period, and energy hits 1952 (strong). The wind is still cross-onshore, so it’s choppy and messy. Not a clean wave.

Thursday, September 10th, still has a solid 8 to 8 feet S/SSE swell, with energy over 1000-2151. Wind is cross or cross-onshore, and the surf quality is poor. Too much wind.

The real standout—and the only clear winner—comes on Wednesday, September 16th. The morning shows a solid 10 feet from the S, with a very long period of 14 seconds. The combined energy is a massive 4020 (very strong). This is a proper groundswell. The wind is light and cross-shore, so it should be clean. Because it’s a river mouth, that long period can make the wave a bit straight, but with that size and light wind, it’s the best bet. The afternoon has the same size but the wind turns cross-onshore, so the morning is the window.

September 17th still has a 5 to 5 feet S/SSE swell with moderate energy (875) and light cross-shore wind, making for surfable but not great conditions.

So, the first week is a blank. The best window is the morning of September 16th. That’s a big-wave day, not for beginners. Crowds are possible at this spot.

Rusty.

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