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Castles Beach Surf Forecast
/ HAW – Oahu (122 breaks) / Hawaii (267 breaks) /
Surf Forecasts:
Castles Beach surfForecast / HAW – Oahu / USA
48hr Weather and Surf, issued 1 pm Saturday 16 May 2026 HSTForecast update in hr min s Forecast update imminent
Castles Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castles Beach sea temperature is
25.3° C
(Which is normal for this time of year)How big are the waves at Castles Beach today?
The current surf forecast for Castles Beach at 10PM is: 1.6m 8s primary swell from a East-northeast direction (forecast issued at 01:00pm May 16). An open ocean swell of 0.4m 10s is not directed at the surf break. The wind direction is predicted to be onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 May) | 6ft (1.8m) | 8s |
| Afternoon (16 May) | 5ft (1.6m) | 8s |
| Evening (16 May) | 5ft (1.6m) | 8s |
Table - waves today at Castles Beach. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 10mm), heaviest on Sat afternoon. Warm (max 25°C on Sat afternoon, min 23°C on Sun night). Winds increasing (calm on Sat night, fresh winds from the ENE by Tue morning). | ||||||||||||||||||||||||
Sat 16 | Sunday 17 | Monday 18 | Tue 19 | |||||||||||||||||||||
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 | 11 PM | 2 AM | 5 AM | 8 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 7 | |
383 | 350 | 350 | 350 | 310 | 330 | 291 | 291 | 256 | 256 | 262 | 344 | 418 | 584 | 559 | 473 | 427 | 427 | 394 | 373 | 373 | 333 | 316 | 285 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | on | glassy | on | on | cross-on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | |
High Tide | 3:09PM0.95m | 1:32AM0.50m | 3:56PM0.96m | 2:04AM0.47m | 4:46PM0.94m | 2:36AM0.44m | ||||||||||||||||||
Low Tide | 9:49PM0.39m | 8:11AM-0.05m | 10:51PM0.40m | 8:51AM-0.04m | 00:02AM0.41m | |||||||||||||||||||
 | | |  |  | | |  | | | |  | |  | |  |  | | | | | | | | |
 | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:50 | — |
 | — | — | 7:01 | — | — | — | — | — | — | — | 7:02 | — | — | — | — | — | — | — | 7:02 | — | — | — | — | 7:02 |
2 | 2 | 1 | 1 | — | — | — | — | — | — | — | 1 | 1 | — | 1 | — | 1 | 1 | 1 | — | — | — | — | — | |
Temp °C | 24 | 24 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 |
25 | 26 | 28 | 28 | 27 | 27 | 26 | 25 | 24 | 24 | 24 | 24 | 23 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 21 | 21 | 21 | |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NNW 10 | NNW 10 | ENE 8 | NNW 10 | NNW 9 | NNW 9 | SSW 14 | SSW 14 | SSW 15 | SSW 16 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 |
 kJ | 383 | 350 | 350 | 350 | 310 | 330 | 291 | 291 | 256 | 39 | 38 | 344 | 18 | 17 | 16 | 20 | 20 | 43 | 48 | 23 | 36 | 19 | 31 | 31 |
Swell 2 Height (m) Direction Period (s) | NW 11 | NW 11 | NW 11 | NNW 11 | NNW 10 | NNW 10 | SSE 7 | NNW 10 | NNW 10 | SSE 6 | SSE 7 | NW 10 | SSW 15 | SSW 15 | SSE 10 | NNW 9 | NNW 9 | NNW 13 | NW 12 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 |
| kJ | 58 | 58 | 58 | 46 | 42 | 41 | 21 | 42 | 41 | 8 | 10 | 24 | 43 | 21 | 20 | 8 | 8 | 17 | 24 | 18 | 18 | 18 | 18 | 40 |
Swell 3 Height (m) Direction Period (s) | NNW 13 | SSE 10 | SSW 16 | SSW 16 | SSE 12 | SSE 9 | NNW 10 | SSE 7 | SSE 6 | SSW 15 | SSW 15 | SSW 15 | NNW 16 | NNW 15 | SSW 14 | NNW 14 | NNW 13 | SSW 19 | SSE 10 | SSW 19 | SE 7 | NNW 13 | SSW 17 | SSW 18 |
| kJ | 17 | 10 | 26 | 26 | 14 | 31 | 42 | 9 | 8 | 44 | 22 | 44 | 25 | 22 | 41 | 20 | 18 | 37 | 10 | 37 | 2 | 17 | 28 | 30 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | ENE 8 | ENE 8 | — | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 7 |
| kJ | — | — | — | — | — | — | — | — | — | 256 | 262 | — | 418 | 584 | 559 | 473 | 427 | 427 | 394 | 373 | 373 | 333 | 316 | 285 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 18 | 18 | 18 | 15 | 18 | 0 | 18 | 18 | 18 | 41 | 18 | 41 | 41 | 41 | 41 | 18 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 41 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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