Nanakuli Blackrocks Surf Forecast and Surf Report

Alright folks, Rusty here. Let’s talk about what’s on offer at Nanakuli Blackrocks.

We’ve got a bit of a mixed bag coming up. The opening stretch sees some clean, workable surf, but the real standout energy builds toward the second week. The water temperature is sitting at 81°, which is pretty much bang on average for this time of year, so no surprises there.

Wednesday the 9th kicks things off with a glassy morning. Swell is 3 ft from the SSW, period of 14 seconds – that’s a nice groundswell pulse. The combined wave energy is moderate at 657. It’s an exposed spot, so it’ll pick up that energy cleanly. The wind is dead calm, making for some of the cleanest surf you’ll see all week. This is the best early call.

Thursday and Friday see the swell drop a touch, but the offshore winds hold. The period gets longer, hitting 17-18 seconds, which is proper long-period groundswell. With the wind off the land, conditions stay tidy. The wave energy drops to the 200-350 range though, so it’s not as punchy. Still, a clean 2 ft wave on a long-period swell can be a joy – just be aware that long-period swells can close out on a beachbreak, but Blackrocks can handle it.

Saturday the 12th goes glassy again but the swell size drops to 2 ft with energy down to 212. It’s surfable, but not much push.

Then there’s a bit of a lull Sunday and Monday morning with very small waves and weak energy, but Monday afternoon sparks back with a 2 ft, 22-second swell. That’s a very long period, energy at 301. That’s a subtle sneaky pulse.

The real standout is Tuesday the 15th. The morning is glassy, calm wind, and a 3 ft SSW swell with a 20-second period. That’s a gorgeous groundswell. Wave energy jumps to 557. For Nanakuli Blackrocks, that’s the pick of the forecast. It’s rare as this break is rarely breaks, so when it lines up like this, you paddle your arse off for it. Crowds are only sometimes an issue, so you might get a few out, but it won’t be a circus.

Wednesday the 16th holds with similar energy, 3 ft at 18 seconds, glassy again. Another magic morning. Then from Thursday the 17th through the 19th, the wind picks up to 16 mph offshore, which stays clean, and the swell holds around 3 ft to 4 ft, with energy in the 600-750 range. That’s moderate but solid, and with offshore wind, it’s good, but the conditions get a bit more challenging with the breeze. The 19th Saturday morning looks good, but the afternoon gets questionable.

From the 20th onward, the swell backs off a bit, still with clean offshore winds, but the energy drops into the 200-350 range and the wave heights go back to 2 ft-3 ft. Not bad for a longboard or a funboard, but nothing to write home about. By the 22nd, the swell shifts to a short-period NNW at 11 seconds, which is weaker and less appealing.

Best call: Tuesday the 15th, Wednesday the 16th, and the 17th-19th mornings all have proper energy and windows. But the 15th morning is the true standout: 3 ft, 20-second groundswell, glassy as a lake, and clean. That’s the one.

Remember, when the swell is that long period, it’ll reel off better at this reefy point setup. Don’t expect the crowd to be massive, but it’s a rare break, so cherish it when it’s on.

Rusty.

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