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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 am Wednesday 20 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
25.6° C
(Which is slightly warmer than usual)How big are the waves at Castles Beach today?
The current surf forecast for Castles Beach at 7AM is: 1.9m 8s primary swell from a East-northeast direction and 0.3m 14s secondary swell from a South-southwest direction (forecast issued at 01:00am May 20). An open ocean swell of 0.5m 12s is not directed at the surf break. The wind direction is predicted to be onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | 6.5ft (2.0m) | 8s |
| Afternoon (20 May) | 7.5ft (2.3m) | 8s |
| Evening (20 May) | 8ft (2.4m) | 8s |
Table - waves today at Castles Beach. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 2mm), mostly falling on Fri night. Warm (max 24°C on Wed morning, min 23°C on Wed morning). Mainly strong winds. | ||||||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
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 | 11 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
ENE 8 | ENE 8 | E 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 | ENE 9 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | |
416 | 437 | 522 | 576 | 639 | 686 | 719 | 763 | 850 | 871 | 889 | 889 | 939 | 1046 | 1120 | 1147 | 1024 | 953 | 953 | 891 | 827 | 789 | 887 | 887 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | |
High Tide | 3:08AM0.41m | 6:33PM0.85m | 4:03AM0.37m | 7:29PM0.80m | 6:51AM0.35m | 8:23PM0.75m | ||||||||||||||||||
Low Tide | 1:30AM0.40m | 10:16AM0.07m | 3:16AM0.37m | 11:05AM0.16m | 3:54AM0.33m | 12:06PM0.26m | ||||||||||||||||||
 |  |  | |  | | | | | | | | | | | | | | | | | | | | |
 | — | 5:50 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — |
 | — | — | — | — | — | 7:04 | — | — | — | — | — | — | — | 7:04 | — | — | — | — | — | — | — | 7:05 | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 24 | 23 | 23 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
22 | 21 | 20 | 21 | 21 | 19 | 19 | 18 | 18 | 18 | 18 | 17 | 18 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | |
Swell 1 Height (m) Direction Period (s) | NNW 11 | NNW 12 | NNW 12 | NNW 10 | NNW 11 | NNW 11 | NNW 11 | NNW 11 | NNW 10 | NW 10 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | NNW 10 | NW 10 | NW 11 | NW 11 | NW 11 | NW 11 |
 kJ | 45 | 78 | 78 | 42 | 65 | 65 | 45 | 44 | 42 | 25 | 19 | 19 | 19 | 9 | 44 | 42 | 42 | 42 | 20 | 27 | 30 | 30 | 30 | 30 |
Swell 2 Height (m) Direction Period (s) | NNW 12 | SSW 14 | SSW 14 | NNW 12 | SSW 14 | SSW 14 | SSW 14 | S 18 | S 17 | SSW 16 | S 16 | S 16 | SSW 16 | SSW 16 | NNW 10 | NNW 9 | NNW 10 | NNW 10 | S 15 | S 14 | S 18 | S 14 | S 13 | S 17 |
| kJ | 30 | 41 | 41 | 29 | 20 | 19 | 18 | 24 | 22 | 25 | 46 | 46 | 51 | 48 | 9 | 9 | 10 | 10 | 17 | 16 | 25 | 14 | 14 | 50 |
Swell 3 Height (m) Direction Period (s) | SSW 15 | SE 9 | SE 9 | SSW 15 | S 18 | S 18 | S 18 | SSW 13 | SSW 13 | SSW 13 | SSE 14 | SSE 13 | SSE 13 | SSE 13 | SSE 13 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | S 18 | S 14 | S 18 | S 18 | S 13 |
| kJ | 42 | 3 | 3 | 21 | 25 | 24 | 25 | 17 | 17 | 17 | 18 | 17 | 17 | 17 | 17 | 16 | 16 | 15 | 15 | 25 | 15 | 25 | 24 | 14 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | E 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 | ENE 9 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 416 | 437 | 522 | 576 | 639 | 686 | 719 | 763 | 850 | 871 | 889 | 889 | 939 | 1046 | 1120 | 1147 | 1024 | 953 | 953 | 891 | 827 | 789 | 887 | 887 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 42 | 41 | 45 | 47 | 50 | 50 | 51 | 123 | 123 | 125 | 125 | 128 | 123 | 127 | 262 | 126 | 50 | 49 | 49 | 155 | 127 | 207 | 154 | 51 |
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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