Surf Forecasts:
Nanakuli Blackrocks surf forecast from 8 Jul 2026:
- Best quality surf: Monday 13 Jul, 8PM (local time) - 3ft (0.9m), 14s period, SW swell with offshore winds.
- Most powerful swell: Saturday 11 Jul, 11PM (local time) - 3ft (0.9m), 18s period, SW swell with 444 kJ wave energy.
- Next surfable swell (1★+): Wednesday 8 Jul, 5AM (local time) - 2.5ft (0.8m), 14s 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 Wednesday (Jul 08) at 5AM. The primary swell is predicted to be 0.8m and 14s 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 0.9m 18s and forecast to arrive on Saturday (Jul 11) at 11PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 7s period and expected on Wednesday (Jul 08) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 8th Jul) | 2.5ft (0.8m) 14s |
| Best Surf | 8PM (Mon 13th Jul) | 3ft (0.9m) 14s |
| Most Powerful | 11PM (Sat 11th Jul) | 3ft (0.9m) 18s |
Table - best surf conditions forecast for Nanakuli Blackrocks over the next 16 days.
Alright, Rusty here. I’m sizing up the next couple of weeks for Nanakuli Blackrocks. This break rarely breaks, so you gotta be picky, and right now, we’re in a long, slow patch.
The first week is a big bust. There’s a huge gap with no real surf. Waves are tiny, mostly 2 to 3ft, with the combined energy barely pushing into the low hundreds. The wind is honking out of the ENE at 18-19 mph offshore, which keeps it clean, but there’s just no power in the water. That dead spell runs from now all the way through to Sunday, July 13th.
Things start to stir on Monday, July 13th. The swell jumps to around 3ft, but the period stretches out to 14-15 seconds, which is real groundswell. Monday afternoon is flagged as “expect good surf conditions.” The first real standout is Tuesday morning, July 14th. We’ve got a 3ft SSW swell with a 14-second period, and the wind drops to a lighter 12 mph offshore. It’s going to be clean and glassy.
But the big one, the one to save the date for, is Wednesday, July 15th. The swell holds around 3ft from the west with a 15-second period, and the combined energy absolutely pumps up to 665 in the morning and 707 in the afternoon. For a spot that’s usually quiet, that’s a massive spike in power. The wind stays a solid 16 mph offshore, so the surface will be smooth. This is a rare, promising window for some longer-period groundswell. Just remember, a 15-second period might make it a bit walled up, but at this size, it should offer up some nice lines.
After that peak, the surf fades fast. By the weekend of July 18th, we’re back to knee-high slop with only a couple of “surfable” waves in the mix. There’s another small bump on Monday, July 21st, with 3ft from the south and a 13-second period, and the morning looks clean, but it’s not a patch on that Wednesday.
Water temp is 80°, which is about 1° warmer than average, so it’s your typical warm tropical water.
So here’s the plan: forget the first week. Start watching the forecasts on Monday, July 13th, and be ready to pull the trigger on Wednesday, July 15th. That’s the day. Crowds are listed as “sometimes,” and with a rare quality window like this, expect a few other souls in the water.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Tue morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri afternoon. Warm (max 27°C on Fri afternoon, min 24°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | |||||||||||||||
AM | 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 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | S 12 | S 12 | S 12 | S 12 | SW 20 | SSW 19 | SW 18 | SW 18 | SW 17 | SW 16 | SSW 16 | SSW 16 | SW 15 | SW 14 | SSW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 350 | 336 | 254 | 243 | 187 | 178 | 112 | 110 | 75 | 71 | 103 | 251 | 260 | 316 | 439 | 376 | 441 | 425 | 322 | 305 | 257 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off |
High Tide | 10:41AM0.48m | 8:10PM0.40m | 11:44AM0.57m | 8:51PM0.33m | 12:38PM0.65m | 10:21PM0.26m | 1:28PM0.73m | 00:04AM0.22m | 2:15PM0.79m | 1:22AM0.21m | 3:01PM0.83m | 2:25AM0.22m | 3:45PM0.84m | 3:22AM0.24m | |||||||
Low Tide | 4:15PM0.36m | 3:41AM0.07m | 7:06PM0.32m | 4:24AM0.05m | 8:47PM0.26m | 5:14AM0.03m | 9:30PM0.20m | 6:08AM0.00m | 10:06PM0.16m | 7:03AM-0.02m | 10:41PM0.13m | 7:56AM-0.03m | 11:16PM0.12m | ||||||||
 | |  | | |  |  | | | |  | | | | | |  | | | | | |
 | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — |
 | — | 7:17 | — | — | 7:17 | — | — | 7:17 | — | — | 7:17 | — | — | 7:17 | — | — | 7:17 | — | — | 7:17 | — |
mm | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 24 | 26 | 27 | 24 | 26 | 27 | 25 | 26 | 27 | 25 | 26 | 27 | 25 | 26 | 27 | 25 | 26 | 26 | 24 |
Feels °C | 23 | 23 | 22 | 23 | 24 | 22 | 24 | 25 | 24 | 25 | 26 | 25 | 24 | 25 | 24 | 24 | 25 | 24 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | ENE 8 | S 12 | S 12 | S 12 | N 6 | N 6 | NNE 7 | E 8 | SW 17 | E 7 | SSW 16 | SSW 16 | E 8 | SW 14 | E 8 |
| kJ | 350 | 336 | 254 | 243 | 187 | 178 | 257 | 110 | 75 | 71 | 16 | 30 | 58 | 186 | 439 | 152 | 441 | 425 | 190 | 305 | 212 |
Swell 2 Height (m) Direction Period (s) | SSE 8 | N 7 | N 8 | SSE 9 | SE 8 | SSE 8 | S 12 | W 14 | N 6 | N 6 | SSW 11 | SSW 19 | SW 18 | SW 18 | NNE 7 | SW 16 | NNE 8 | NNE 8 | SW 15 | NNE 7 | SSW 14 |
| kJ | 7 | 31 | 1 | 8 | 11 | 7 | 112 | 33 | 20 | 11 | 41 | 251 | 260 | 316 | 54 | 376 | 94 | 89 | 322 | 49 | 257 |
Swell 3 Height (m) Direction Period (s) | NW 9 | SE 8 | — | S 18 | S 18 | W 15 | SSE 6 | SSE 8 | W 13 | W 14 | SW 20 | S 11 | S 12 | N 6 | W 13 | NNE 8 | SSE 12 | SSE 12 | NNE 7 | W 18 | NNE 7 |
| kJ | 3 | 3 | — | 25 | 6 | 17 | 6 | 6 | 30 | 36 | 103 | 64 | 44 | 41 | 54 | 75 | 48 | 47 | 57 | 157 | 47 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | E 7 | E 7 | E 7 | E 8 | — | ENE 8 | E 7 | E 7 | E 8 | E 8 | E 8 | E 8 | E 7 | E 7 | E 8 | E 8 | E 8 | E 8 | — |
| kJ | 353 | 327 | 320 | 262 | 311 | 408 | — | 266 | 186 | 245 | 249 | 290 | 222 | 253 | 150 | 186 | 182 | 305 | 257 | 258 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 159 | 159 | 7 | 7 | 159 | 8 | 8 | 13 | 0 | 0 | 7 | 7 | 159 | 13 | 0 | 7 | 10 | 7 | 7 | 0 | 0 |
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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