Nanakuli Blackrocks Surf Forecast and Surf Report

Alright, folks, Rusty here. Let's have a look at what's on the cards for the Nanakuli Blackrocks stretch. We're looking at a bit of a slow starter, but the second half of the forecast period is where things get interesting.

The water temperature is sitting right around average for this time of year, a comfy 81°, nothing out of the ordinary.

For the first few days, from Wednesday the 5th right through the 6th and into the 7th, we're looking at tiny, ankle-snapper swell. We're talking 1ft to 2ft on the face. The wind is offshore, light to moderate, so the surface will be clean, but there's just not enough oomph to get you excited. The combined energy is weak, well under 200 (132 to 147). It's a classic case of "surfable waves but very ordinary conditions," as the data says.

Friday the 7th brings a bit more interest, with the swell period stretching out to a very long 20 to 21 seconds. That's proper groundswell energy, but with the height still only 1ft, the long period will make it close out on a beach break. The combined energy bumps up a notch to 191, but it's still just a tease.

Saturday the 8th sees a little more size, 2ft to 2ft, and the wind holds offshore. The energy is starting to build, hitting 332, but it's still a marginal day. The tide might be playing tricks, and the swell is a bit mushy.

Now, from Sunday the 9th, things start to get better. The swell is still small, 2ft to 3ft, but the quality is on the up. "Expect good surf conditions" start popping up. The energy is moderate, sitting between 226 and 460. The wind is consistently offshore, keeping things clean. It's not going to be a world-beater, but for a quiet paddle, it's fine.

The real standout period kicks off on Wednesday the 12th of August. The swell jumps to a solid 3ft to 4ft, coming from the south with a period of 18 seconds. That's proper groundswell, and the combined energy surges to 849. This is "very good surf conditions." The wind is a moderate offshore breeze, so it's going to be clean. The swell size is just right for intermediate surfers, not too big, not too small.

Thursday the 13th is the peak of this run. The swell hits 4ft, the biggest in the whole forecast, with a combined energy of 967. The wind is still offshore. This is the best in the window. The 4ft swell with that long period and offshore wind at Nanakuli Blackrocks is going to produce some clean, lined-up waves. It's a no-brainer.

After that, the swell slowly fades through the weekend of the 15th and 16th, dropping back to 2ft to 3ft. The wind stays offshore, but the energy drops. The long-range stuff into the 17th, 18th, and 19th is a mixed bag, with a bit of a bump from the SSE on the 18th, but the period is short (9 seconds) and the energy is moderate. The end of the window on the 20th sees a brief return of a longer period SW swell, but the size is small.

The standout is clearly Thursday the 13th of August. That's the day. The 4ft, 16-second south swell with offshore winds is the best the 16 days have to offer. The Wednesday the 12th is a close second.

Rusty out.

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