Surf Forecasts:
Nanakuli Blackrocks surf forecast from 26 Jul 2026:
- Best quality surf: Sunday 26 Jul, 2AM (local time) - 3.5ft (1.0m), 18s period, SSW swell with offshore winds.
- Most powerful swell: Sunday 26 Jul, 2AM (local time) - 3.5ft (1.0m), 18s period, SSW swell with 662 kJ wave energy.
- Next surfable swell (1★+): Sunday 26 Jul, 2AM (local time) - 3.5ft (1.0m), 18s period with SSW swell.
Best Forecast Surf Conditions for Nanakuli Blackrocks this week:
The surf forecast for Nanakuli Blackrocks over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jul 26) at 2AM. The primary swell is predicted to be 1.0m and 18s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Nanakuli Blackrocks in the next 16 days are 1.0m 18s and forecast to arrive on Sunday (Jul 26) at 2AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 8s period and expected on Saturday (Aug 01) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sun 26th Jul) | 3.5ft (1.0m) 18s |
| Best Surf | 2AM (Sun 26th Jul) | 3.5ft (1.0m) 18s |
| Most Powerful | 2AM (Sun 26th Jul) | 3.5ft (1.0m) 18s |
Table - best surf conditions forecast for Nanakuli Blackrocks over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about what's on offer for the next couple of weeks.
First up, we're looking at Nanakuli Blackrocks. This spot is a real tease, it's a rare break that needs everything to line up, and for the most part over the next week, it's just not gonna happen. The swell is there, but it's mostly small, around 2ft to 3ft with a long period of 15-16 seconds coming from the SSW. The combined swell energy is moderate, peaking at 561 on Sunday the 26th, but the real issue is the wind. It's blowing offshore from the ENE at 15 mph, which is clean, but it's a moderate breeze, and for a spot that's exposed to a WSW swell, the direction is all wrong. The optimum swell direction for this break is WSW, and we're getting a SSW swell, so it's just not lighting up properly.
The best bet in this whole stretch is actually Sunday the 9th of August into Monday the 10th. That's the standout. On Sunday morning, we're looking at a 3ft SSW groundswell with a 16-second period, and the combined energy hits 397. The wind is a moderate offshore breeze from the E at 12 mph, keeping things clean. The water temperature is about average for this time of year, so no surprises there. It's not a big wave, but it's the most consistent offering we've got. By Sunday afternoon, the wind drops to a light breeze from the E at 6 mph, and the energy jumps to 447. Monday morning keeps it going with a 3ft SSW swell, 15-second period, and a gentle offshore breeze. The crowds are possible here, but given the size, it won't be a zoo.
Other than that, there's a lot of flatness. From the end of July through to the 9th of August, the waves are mostly small, poor quality, or blown out. The Tuesday the 28th of July and Wednesday the 30th of July have some glassy mornings, but the swell is tiny, under 3ft, and very weak on energy. It's just not worth the paddle.
So, to be straight with you: the only real window is the 9th and 10th of August. It's a long way off, so don't bank on it, but it's the best shot we've got. If you're a beginner, this is totally fine, but for anyone else, it's a small wave day. For a place that rarely breaks, you take what you can get.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Tue afternoon, min 24°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Thu afternoon, min 25°C on Tue night). Winds increasing (calm on Wed night, fresh winds from the E by Fri afternoon). | ||||||||||||||||||
Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | SSW 18 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | S 13 | S 14 | S 14 | S 14 | S 13 | SSW 18 | SW 16 | SW 16 | SW 15 | SW 15 |
Wave Graph  | |||||||||||||||||||
 kJ | 662 | 561 | 452 | 416 | 288 | 284 | 213 | 189 | 187 | 125 | 264 | 257 | 243 | 229 | 222 | 268 | 258 | 232 | 220 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross | glassy | cross-off | glassy | cross | cross-off | off | off | off |
High Tide | 1:26AM0.22m | 2:47PM0.69m | 2:10AM0.23m | 3:19PM0.71m | 2:49AM0.25m | 3:50PM0.72m | 3:28AM0.27m | 4:18PM0.72m | 4:07AM0.30m | 4:45PM0.70m | 4:50AM0.33m | 5:11PM0.66m | |||||||
Low Tide | 10:04PM0.18m | 6:52AM0.07m | 10:23PM0.17m | 7:35AM0.05m | 10:44PM0.15m | 8:15AM0.04m | 11:05PM0.15m | 8:53AM0.04m | 11:26PM0.14m | 9:30AM0.07m | 11:47PM0.13m | 10:08AM0.10m | 00:07AM0.12m | ||||||
 |  | |  |  | | | | | | | | | | | | | | | |
 | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — |
 | 7:14 | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:12 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 27 | 25 | 26 | 27 | 25 | 27 | 28 | 26 | 26 | 26 | 26 | 27 | 28 | 26 | 27 | 27 | 25 |
Feels °C | 24 | 24 | 24 | 24 | 25 | 26 | 25 | 29 | 29 | 27 | 29 | 29 | 31 | 30 | 32 | 28 | 25 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | SSW 16 | E 15 | E 14 | E 13 | E 14 | E 13 | E 13 | E 12 | ENE 11 | ENE 10 | N 8 | E 8 | E 8 | S 13 | S 12 | SW 15 | SW 15 |
| kJ | 159 | 133 | 452 | 418 | 465 | 507 | 1036 | 1006 | 1421 | 1062 | 657 | 404 | 110 | 113 | 127 | 163 | 148 | 232 | 220 |
Swell 2 Height (m) Direction Period (s) | SSW 18 | SSW 16 | E 14 | SSW 16 | SSW 15 | SSW 15 | NNE 6 | NNE 7 | SSW 13 | S 13 | S 14 | S 14 | ENE 9 | S 13 | S 13 | SW 16 | SW 16 | S 12 | E 15 |
| kJ | 662 | 561 | 264 | 416 | 288 | 284 | 51 | 60 | 187 | 125 | 264 | 257 | 138 | 229 | 222 | 268 | 258 | 104 | 150 |
Swell 3 Height (m) Direction Period (s) | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | S 10 | SSW 14 | SSW 14 | SE 8 | SSW 15 | SW 21 | SW 19 | S 14 | N 7 | SSW 18 | SSE 6 | E 16 | E 15 | S 12 |
| kJ | 85 | 75 | 63 | 67 | 65 | 9 | 213 | 189 | 3 | 75 | 17 | 59 | 243 | 45 | 207 | 14 | 121 | 161 | 71 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | E 7 | E 7 | E 7 | ENE 7 | ENE 13 | ENE 13 | N 6 | NNE 6 | N 6 | N 6 | — | — | — | E 8 | E 8 | E 8 | E 8 |
| kJ | 232 | 202 | 150 | 123 | 111 | 150 | 950 | 854 | 35 | 64 | 65 | 79 | — | — | — | 168 | 223 | 266 | 526 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 7 | 7 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 26 | 4 | 7 | 10 | 10 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Nanakuli Blackrocks Surf forecast
The above surf forecast table for Nanakuli Blackrocks provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Nanakuli Blackrocks can be found by selecting the local surf guide option on the grey menu. Our Nanakuli Blackrocks surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Nanakuli Blackrocks) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Nanakuli Blackrocks may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Nanakuli Blackrocks is 6 km (4 miles) from Makakilo City. If you plan a vacation in Oahu, look for hotels and other accommodation in Makakilo City. Makakilo City has rooms for a wide range of budgets as well as car hire and transport links.
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