Hanamizu River Surf Forecast and Surf Report

Alright, Rusty here. Let's get into what we’ve got on the radar. It’s a slow start, and the first week is mostly a write-off, so don’t be in a rush.

We’re looking at Hanamizu River (Big Island), and to be brutally honest, the first several days are a tough watch. From Friday the 3rd right through to the end of Monday the 6th, the swell is tiny, mostly under 2 ft, with weak, short-period windswell. The combined energy is pitiful (34 to 106), and the wind is all over the shop – cross, cross-on, and light. It’s just poor surf, flat and messy. There’s no reason to even wax the board. That’s a solid four-day gap of nothing worth paddling out for.

Things start to change by Tuesday morning the 7th. We see a pulse of long-period groundswell starting to fill in from the SSE – 4 ft, but with a very long 17-second period. The combined energy jumps to a moderate 754, which is a big step up. The wind is light and onshore, so it's not clean, but you can feel the ocean waking up. The period is so long though; at a beach/sandbar setup like this, those waves might be a bit too straight, making it tricky. That caveat aside, it’s the first sign of life.

Wednesday the 8th gets a bit more size, with 6-6 ft SSE swell pushing in, but the cross-onshore wind is a bit of a buzzkill, making it choppy. Energy is strong now, hitting 1881. It’s still a marginal call; the power is there but the wind isn’t doing us any favours. Thursday the 9th holds size at 6 ft, building to 7 ft in the afternoon from the S, with a long 16-17 second period. The wind shifts to a clean cross-shore, which is a massive improvement. Energy is cranking at 3275. This is starting to look fun, but it’s still a bit raw and lumpy from the previous days’ chop.

Now, the standout window. Friday morning the 10th is the one to circle. We’ve got a solid 8 ft S groundswell with an 18-second period – that’s a proper, powerful groundswell. The combined energy is a beefy 3903 (strong). But the kicker is the wind: glassy, from the ESE at just 3 mph. That is absolutely pristine. The report calls it “excellent surf conditions for experienced surfers,” and I agree. At 8 ft, that’s expert territory only. The long period means those sets will have serious grunt. The crowds are listed as *sometimes*, so you might have a few others around, but if you’re experienced and hungry, that Friday morning is the best on offer by a long shot.

Saturday the 11th drops back a touch to 7 ft and the wind goes cross-on again, so it’s not as clean. The energy is still strong at 1982, but it’s a step down. Sunday morning the 12th is another decent window with 4 ft SSW swell, light and glassy with a 13-second period. The energy is moderate at 474, and it’s called “expect good surf conditions.” That would be a great session for intermediate surfers. But the afternoon turns to junk.

From Monday the 13th right through to Saturday the 18th, the swell fades hard. We’re back to tiny 1-3 ft waves, weak energy (under 240), and mostly onshore or cross-on winds. It just flat-lines. There are no more standouts in that second week; it’s a long, quiet run.

So, bottom line: suffer through the first week, keep an eye on Thursday the 9th for the build-up, but the clear winner is Friday morning, July 10th at Hanamizu River. Big, clean, glassy, powerful groundswell. Experts only, but true quality.

- Rusty

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