Nanakuli Blackrocks Surf Forecast and Surf Report

Alright folks, Rusty here. Let’s have a look at what’s coming up for Nanakuli Blackrocks. This spot is a bit of a tricky one – it rarely breaks, so when it does, you’ve got to pay attention. The water temp is sitting at a comfortable 81°, which is about average for this time of year, so nothing unusual there.

The surf window starts off pretty quiet. Thursday afternoon, August 6th, we’ve got tiny 2ft waves from the SW with a 14-second period, and clean offshore winds from the ENE at 9 mph. The energy is weak, only 114, so it’s small and ordinary. Friday morning, August 7th, is similar with 1ft from the SSW, but the afternoon sees a jump in period to 20 seconds, even though the height stays small at 1ft. The energy picks up to 189, but it’s still nothing to write home about.

Saturday morning, August 8th, is where things start to look a little better. We’ve got 2ft from the SSW, 14-second period, and the energy is moderate at 332. The wind is still clean offshore. That’s a decent little window for a rare break, but it’s not a standout.

The real standout, the one you want to circle, is Wednesday morning, August 12th. The swell bumps up to 3ft from the S, with an 18-second period, and the energy leaps to 916 – that’s strong for this spot. The winds are offshore and moderate, so the conditions will be clean. This is the best on offer. It’s not giant, but for a rarely-breaking reef, that’s a solid groundswell with good shape. Later that afternoon, the energy stays high at 932, but the conditions get a bit more marginal with stronger winds.

Thursday morning, August 13th, is another strong contender with 4ft from the S, 16-second period, and energy at 886. The winds are clean but a bit stronger at 16 mph. This is still good, but the top pick is the Wednesday morning.

The second week sees a drop-off. From Friday, August 14th, through the weekend, we’ve got smaller waves (2ft to 3ft) and fresh winds up to 22 mph, making for poor or marginal conditions. The energy drops back to the 300-400 range. It’s not worth paddling out.

Then, on the 20th and 21st of August, we see a late pulse. Thursday morning, August 20th, has 2ft from the SSW with a very long 21-second period and energy at 429. Friday morning, August 21st, has 3ft from the SSW with a 19-second period and energy at 656. These are promising, but they’re far out, so less certain. The long period means the waves will have good shape at Blackrocks, which is a reef, so that’s a plus.

Overall, if you’re chasing this rare break, the best bet is the morning of Wednesday, August 12th, or the morning of Thursday, August 13th. After that, it’s a gamble.

Rusty.

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