Nanakuli Blackrocks Surf Forecast and Surf Report

Alright folks, Rusty here. Let’s have a look at what’s cooking for the next couple of weeks.

Alright, straight up: this is a tricky one. The forecast for Nanakuli Blackrocks is a bit of a mixed bag. We’ve got a long stretch of clean, offshore winds but the swell is mostly small and inconsistent. The spot is known to be a rare breaker, and that’s the story here – it’s not going to be pumping, but there are a few windows where it’ll be worth a look.

The water temp is sitting at 80°, which is bang on average for this time of year, so no need for a thick wetsuit.

The first real chance to get wet comes Thursday afternoon, July 16th. We’re looking at a 3 ft swell from the west with a moderate 14-second period, producing a moderate wave energy of (413). The wind is a clean offshore easterly at 12 mph, so the surface will be nice and tidy. It’s not a big swell, but it’s a start.

Friday, July 17th, things get a little more interesting. The swell drops a touch to 2 ft but swings around to the south-southwest and the period jumps to 16 seconds – that’s proper groundswell energy. The combined energy is strong at (497) for the morning. Winds are light offshore from the east at 9 mph, making for a gentle offshore and clean session. The afternoon holds up similarly with a bit more breeze. This is a standout for the first week.

Saturday, July 18th, through Sunday, July 19th, the swell stays small and the period drops. The energy dips into the moderate category (274 and 119) and the conditions become more ordinary. The wind stays offshore, but it’s not going to be a session to write home about.

Monday, July 20th, sees a return of a longer period swell (16 seconds) from the south, with a solid energy reading of (487) in the afternoon. The swell is only 3 ft, but that long period combined with light easterly winds (6 mph) and a “clean” wind state will make for some surprisingly fun, lined-up waves. This is a good pick for the mellow surfer.

Tuesday, July 21st, is consistent with 3 ft south swell and moderate energy (480), but the wind picks up a touch.

Now, here’s where it gets interesting. The real standout in the whole outlook is Wednesday, July 22nd. The swell is small at 2 ft, but the period is a massive 24 seconds – that’s a very long period groundswell. The energy is still very strong at (695). At a reef, this long period will translate into super clean, well-shaped lines. The wind is a moderate offshore from the east, keeping it glassy. This is a diamond in the rough for the experienced surfer who knows how to read a long period swell.

The rest of the period from July 23rd through the 27th is plagued by stronger winds (15-19 mph) and “marginal” conditions, despite the energy staying high. The swell direction is mostly south-southwest, but the wind is fresh and offshore, making it a bit bumpy and challenging.

The very end of the window, July 28th and 29th, offers a brief reprieve. Tuesday morning, July 28th, has a glassy condition with no wind, 3 ft swell, and moderate energy (280). It’s small, but it’s clean. Wednesday morning, July 29th, is also glassy with a 2 ft south swell.

After that, it tails off into small, short-period slop with very low energy (30) by Friday, July 31st.

So, for the best on offer, I’d point you to Friday, July 17th, for the clean groundswell, and the absolute standout being Wednesday, July 22nd, for that super-long period energy. The second week is weaker and windier, so don’t hold your breath for any magic.

This is Rusty, signing off.

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