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Nanakuli Blackrocks Surf Forecast
/ HAW – Oahu (122 breaks) / Hawaii (267 breaks) /
Surf Forecasts:
Nanakuli Blackrocks surfForecast / HAW – Oahu / USA
48hr Weather and Surf, issued 1 am Wednesday 20 Aug 2025 HST
How big are the waves at Nanakuli Blackrocks today?
The current surf forecast for Nanakuli Blackrocks at 4AM is: 0.5m 16s primary swell from a South direction and 0.5m 12s secondary swell from a South direction (forecast issued at 01:00am August 20). An open ocean swell of 1.1m 6s is not directed at the surf break. The wind direction is predicted to be offshore and the swell rating is 2.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Aug) | 2ft (0.6m) | 16s |
| Afternoon (20 Aug) | 2ft (0.6m) | 16s |
| Evening (20 Aug) | 2.5ft (0.7m) | 15s |
Table - waves today at Nanakuli Blackrocks. (Swell directed towards the surf break)
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
| 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
| Energy (?) | 207 | 199 | 209 | 205 | 259 | 287 | 343 | 331 | 310 | 318 | 267 | 264 | 264 | 234 | 240 | 264 | 262 | 222 | 264 | 222 | 265 | 229 | 280 | 264 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off |
High Tide / height (m) | 1:41AM 0.24 | 2:33PM 0.74 | 2:28AM 0.28 | 3:09PM 0.73 | 3:09AM 0.33 | 3:41PM 0.71 | ||||||||||||||||||
Low Tide / height (m) | 9:30PM 0.14 | 6:55AM 0.05 | 9:51PM 0.13 | 7:48AM 0.05 | 10:12PM 0.12 | 8:35AM 0.06 | ||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:11 | - | - | - | - | - | - | - | 6:11 | - | - | - | - | - | - | - | 6:13 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:59 | - | - | - | - | - | - | - | 6:58 | - | - | - | - | - | - | - | 6:57 | - |
 | | |  | |  | |  | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 25 | 25 | 25 | 25 | 28 | 28 | 27 | 25 | 25 | 25 | 25 | 25 | 27 | 28 | 27 | 26 | 25 | 25 | 25 | 25 | 27 | 28 | 27 | 25 |
| Feels °C (?) | 25 | 25 | 25 | 25 | 28 | 27 | 25 | 24 | 24 | 24 | 25 | 24 | 25 | 25 | 25 | 26 | 25 | 25 | 25 | 24 | 25 | 26 | 25 | 24 |
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Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for HAW - Oahu
Continuing clean conditions at Nanakuli Blackrocks (light winds from the ENE at Kalaeloa Airport 9 km from Nanakuli Blackrocks). 0.5m 9s swell from the SSE with a 0.3m 15s groundswell from the S and a 0.2m 10s swell from the NW. 3 swells combining to make bigger set waves.
1 h 52 min ago
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