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Surf Forecasts:
Kahuku Ranch surfForecast / HAW – Big Island / USA
48hr Weather and Surf, issued 7 pm Wednesday 17 Sep 2025 HST
How big are the waves at Kahuku Ranch today?
The current surf forecast for Kahuku Ranch at 8PM is: 0.3m 15s primary swell from a Southwest direction and 0.3m 12s secondary swell from a South-southwest direction (forecast issued at 07:00pm September 17). An open ocean swell of 1.8m 7s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Sep) | - | - |
| Afternoon (17 Sep) | 1.5ft (0.4m) | 15s |
| Evening (17 Sep) | 1ft (0.3m) | 15s |
Table - waves today at Kahuku Ranch. (Swell directed towards the surf break)
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | |||||||||||||||||||||
| 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 | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 15 | 15 | 12 | 12 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 19 | 19 | 18 | 18 | 18 | 17 | 16 | 16 | 16 | 16 | 16 | 15 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 35 | 35 | 46 | 49 | 53 | 53 | 32 | 51 | 51 | 49 | 46 | 46 | 74 | 123 | 107 | 246 | 322 | 315 | 354 | 269 | 366 | 446 | 429 | 392 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 1:43AM 0.54 | 2:00PM 0.90 | 2:20AM 0.62 | 2:32PM 0.89 | 2:53AM 0.70 | |||||||||||||||||||
Low Tide / height (m) | 8:14PM 0.17 | 7:16AM 0.15 | 8:38PM 0.14 | 8:02AM 0.13 | 9:00PM 0.11 | 8:43AM 0.12 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 6:09 | - | - | - | - | - | - | - | 6:11 | - | - | - | - | - | - | - | 6:11 | - | - |
| Sunset | 6:22 | - | - | - | - | - | - | - | 6:22 | - | - | - | - | - | - | - | 6:21 | - | - | - | - | - | - | - |
 |  | |  |  |  |  | | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 26 | 25 | 25 | 25 | 24 | 25 | 27 | 27 | 26 | 25 | 25 | 25 | 25 | 25 | 27 | 27 | 27 | 26 | 25 | 25 | 25 | 26 | 27 | 27 |
| Feels °C (?) | 23 | 22 | 22 | 23 | 21 | 21 | 23 | 25 | 25 | 24 | 25 | 25 | 27 | 26 | 29 | 29 | 29 | 29 | 28 | 27 | 26 | 25 | 25 | 26 |
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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 - Big Island
Offshore wind has become very light (calm at Captain Cook 43 km from Kahuku Ranch). Surf should be turning clean at Kahuku Ranch. 0.3m 12s groundswell from the SSW with a 0.2m 15s groundswell, also from the SSW and a 0.1m 16s long period groundswell, also from the SSE. 3 swells combining to make bigger set waves.
43 km away, 2 h 43 min ago
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