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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 Thursday 21 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 normal for this time of year)How big are the waves at Castles Beach today?
The current surf forecast for Castles Beach at 9AM is: 2.5m 8s primary swell from a East-northeast direction and 0.2m 16s secondary swell from a South direction (forecast issued at 01:00am May 21). An open ocean swell of 0.3m 10s is not directed at the surf break. The wind direction is predicted to be onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 May) | 8ft (2.5m) | 8s |
| Afternoon (21 May) | 8ft (2.5m) | 8s |
| Evening (21 May) | 10ft (3.0m) | 8s |
Table - waves today at Castles Beach. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastSome drizzle, heaviest during Sat morning. Warm (max 23°C on Thu morning, min 23°C on Thu morning). Mainly strong winds. | ||||||||||||||||||||||||
Thursday 21 | Friday 22 | Saturday 23 | ||||||||||||||||||||||
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 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | 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 | |
829 | 1009 | 956 | 979 | 979 | 1071 | 1094 | 1147 | 1072 | 953 | 953 | 891 | 837 | 935 | 949 | 878 | 850 | 817 | 778 | 993 | 1003 | 925 | 925 | 864 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | |
High Tide | 4:03AM0.37m | 7:29PM0.80m | 6:51AM0.35m | 8:23PM0.75m | 9:44AM0.41m | 9:11PM0.70m | ||||||||||||||||||
Low Tide | 3:16AM0.37m | 11:05AM0.16m | 3:54AM0.33m | 12:06PM0.26m | 4:21AM0.29m | 1:41PM0.36m | ||||||||||||||||||
 |  |  | | |  | | | | | |  | | | | | | | |  | | |  | | |
 | — | 5:50 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — |
 | — | — | — | — | — | 7:04 | — | — | — | — | — | — | — | 7:05 | — | — | — | — | — | — | — | 7:05 | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | |
Temp °C | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 17 | 18 | 18 | 18 | 18 | 18 | 17 | 18 | 18 | 17 | 18 | |
Swell 1 Height (m) Direction Period (s) | NNW 10 | NNW 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 | NW 11 | NW 11 | NW 10 | NW 16 | NNW 16 | NNW 15 | NNW 14 | NNW 14 |
 kJ | 42 | 39 | 19 | 19 | 19 | 9 | 44 | 42 | 42 | 42 | 20 | 27 | 30 | 30 | 30 | 30 | 30 | 29 | 27 | 67 | 99 | 148 | 140 | 134 |
Swell 2 Height (m) Direction Period (s) | S 17 | SSW 16 | S 16 | S 16 | S 16 | SSW 16 | NNW 10 | NNW 10 | NNW 10 | NNW 10 | S 15 | S 14 | S 18 | S 14 | S 13 | S 17 | S 16 | S 16 | S 16 | NW 10 | NW 10 | S 15 | S 15 | S 15 |
| kJ | 22 | 25 | 20 | 46 | 20 | 48 | 9 | 9 | 10 | 10 | 17 | 16 | 25 | 14 | 14 | 50 | 47 | 46 | 46 | 27 | 26 | 39 | 38 | 38 |
Swell 3 Height (m) Direction Period (s) | 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 | S 13 | NNW 18 | NNW 18 | S 16 | S 15 | NW 10 | NW 10 | NW 10 |
| kJ | 17 | 17 | 18 | 17 | 17 | 17 | 16 | 16 | 16 | 15 | 15 | 25 | 15 | 25 | 24 | 14 | 14 | 31 | 60 | 45 | 42 | 26 | 25 | 16 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | 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 |
| kJ | 829 | 1009 | 956 | 979 | 979 | 1071 | 1094 | 1147 | 1072 | 953 | 953 | 891 | 837 | 935 | 949 | 878 | 850 | 817 | 778 | 993 | 1003 | 925 | 925 | 864 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 125 | 125 | 125 | 145 | 125 | 126 | 262 | 126 | 123 | 51 | 49 | 205 | 207 | 205 | 205 | 205 | 51 | 125 | 205 | 213 | 205 | 125 | 47 | 123 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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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)
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