Surf Forecasts:
Nanakuli Blackrocks surf forecast from 29 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 5AM (local time) - 2.5ft (0.7m), 14s period, SSW swell with cross-offshore winds.
- Most powerful swell: Friday 31 Jul, 2AM (local time) - 2.5ft (0.7m), 16s period, SW swell with 268 kJ wave energy.
- Next surfable swell (1★+): Tuesday 28 Jul, 11PM (local time) - 2ft (0.6m), 13s 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 Tuesday (Jul 28) at 11PM. The primary swell is predicted to be 0.6m and 13s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Nanakuli Blackrocks in the next 16 days are 0.7m 16s and forecast to arrive on Friday (Jul 31) 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 2.3m 8s period and expected on Saturday (Aug 01) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Tue 28th Jul) | 2ft (0.6m) 13s |
| Best Surf | 5AM (Wed 29th Jul) | 2.5ft (0.7m) 14s |
| Most Powerful | 2AM (Fri 31st Jul) | 2.5ft (0.7m) 16s |
Table - best surf conditions forecast for Nanakuli Blackrocks over the next 16 days.
The Lowdown
Alright, Rusty here again, this time in feet and miles per hour.
The outlook is a slow starter. Nothing to really chase for the first week, but there’s a good window building around the 10th of August. That Monday morning is the pick: a SSW swell around 4ft with a 15-second period. Light offshore winds from the ENE at 9 mph. The combined swell energy sits at 669, which is solid. That’s the closest thing to a must-surf day.
Sunday the 9th afternoon also shows some promise—around 3ft from the SSW with a very long 17-second period. Keep in mind a long period like that can make waves wall up on beach breaks, but Nanakuli is exposed enough to handle it. Temps are about average for the season at 80°F.
Crowds? This spot breaks rarely, so when it’s on, it may draw a few people but not a madhouse. The best conditions for the 10th are clean with moderate offshore breeze. The 12th of August also has a solid 3ft south swell, cross-offshore wind, and energy at 505—worth a look.
Overall, it’s a quiet 16 days, save for that Monday the 10th. That’s the window. Mark it.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Tue afternoon, min 25°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Fri afternoon, min 24°C on Fri night). Winds decreasing (fresh winds from the ENE on Sat afternoon, light winds from the ENE by Mon morning). | |||||||||||||||||||
Tue 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | ||||||||||||||
PM | 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 13 | SSW 13 | S 14 | S 14 | S 14 | S 13 | SSW 18 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SSW 14 | SSW 14 | SSW 14 | E 9 | E 9 | E 9 | ENE 9 | SSW 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 187 | 135 | 203 | 257 | 243 | 229 | 222 | 268 | 258 | 232 | 220 | 191 | 123 | 131 | 127 | 0 | 0 | 0 | 0 | 56 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross | off | glassy | off | off | off | off | off | off | off | off | off | off | off | off | off | off |
High Tide | 3:50PM0.72m | 3:28AM0.27m | 4:18PM0.72m | 4:07AM0.30m | 4:45PM0.70m | 4:50AM0.33m | 5:11PM0.66m | 5:36AM0.37m | 5:35PM0.61m | 6:28AM0.40m | 5:58PM0.54m | 7:27AM0.45m | 6:19PM0.47m | |||||||
Low Tide | 11:05PM0.15m | 8:53AM0.04m | 11:26PM0.14m | 9:30AM0.07m | 11:47PM0.13m | 10:08AM0.10m | 00:07AM0.12m | 10:50AM0.16m | 00:28AM0.11m | 11:40AM0.22m | 00:51AM0.10m | 12:43PM0.28m | 1:18AM0.09m | |||||||
 |  | | |  | |  | | | | | | | | | | | | | | |
 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — |
 | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:12 | — | — | 7:10 | — | — | 7:10 | — | — | 7:09 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 28 | 25 | 26 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 25 |
Feels °C | 29 | 27 | 28 | 29 | 30 | 31 | 30 | 26 | 25 | 25 | 23 | 22 | 23 | 23 | 25 | 24 | 24 | 27 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | E 13 | E 12 | ENE 10 | ENE 9 | S 14 | E 8 | E 8 | S 13 | E 8 | SW 15 | SW 15 | SW 14 | SSW 14 | E 14 | E 14 | E 9 | E 9 | E 9 | E 9 | E 13 |
| kJ | 1087 | 699 | 300 | 185 | 243 | 105 | 98 | 212 | 186 | 232 | 220 | 191 | 123 | 142 | 146 | 373 | 247 | 220 | 185 | 461 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | N 6 | S 14 | S 14 | ENE 9 | S 13 | S 13 | SW 16 | S 12 | E 16 | E 15 | E 14 | E 14 | SSW 14 | N 6 | E 14 | N 7 | E 13 | E 13 | N 6 |
| kJ | 187 | 44 | 203 | 257 | 103 | 229 | 222 | 268 | 148 | 172 | 153 | 148 | 142 | 131 | 29 | 144 | 32 | 130 | 130 | 17 |
Swell 3 Height (m) Direction Period (s) | SE 8 | SSW 13 | N 6 | N 7 | N 8 | N 7 | SSW 18 | SE 6 | SW 16 | S 12 | S 12 | S 12 | S 11 | S 11 | SSW 14 | N 6 | E 14 | N 6 | N 6 | SSW 12 |
| kJ | 3 | 135 | 26 | 46 | 80 | 47 | 207 | 17 | 258 | 104 | 71 | 41 | 39 | 22 | 127 | 28 | 146 | 19 | 28 | 56 |
Wind waves Height (m) Direction Period (s) | NNE 6 | — | — | — | — | — | — | E 8 | — | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | — | E 9 | — | ENE 9 | ENE 9 |
| kJ | 56 | — | — | — | — | — | — | 138 | — | 262 | 453 | 669 | 587 | 616 | 450 | — | 347 | — | 270 | 162 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 7 | 15 | 159 | 180 | 159 | 10 | 7 | 169 | 1 | 1 | 1 | 1 |
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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