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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 7 am Monday 18 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 1PM is: 1.9m 8s primary swell from a East-northeast direction and 0.3m 15s secondary swell from a South-southwest direction (forecast issued at 07:00am May 18). An open ocean swell of 0.2m 13s is not directed at the surf break. The wind direction is predicted to be onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | 6ft (1.8m) | 8s |
| Afternoon (18 May) | 6ft (1.8m) | 8s |
| Evening (18 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 ForecastSome drizzle, heaviest during Tue morning. Warm (max 24°C on Mon morning, min 23°C on Tue night). Mainly strong winds. | ||||||||||||||||||||||||
Monday 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
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 | 2 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | E 8 | E 8 | E 8 | E 8 | E 8 | ENE 8 | ENE 6 | ENE 6 | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | |
473 | 427 | 427 | 473 | 427 | 341 | 176 | 294 | 286 | 286 | 272 | 286 | 333 | 237 | 273 | 438 | 449 | 522 | 528 | 623 | 686 | 686 | 745 | 745 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | |
High Tide | 2:04AM0.47m | 4:46PM0.94m | 2:36AM0.44m | 5:38PM0.90m | 3:08AM0.41m | 6:33PM0.85m | ||||||||||||||||||
Low Tide | 8:51AM-0.04m | 00:02AM0.41m | 9:32AM0.01m | 1:30AM0.40m | 10:16AM0.07m | |||||||||||||||||||
 |  | |  | | | | | |  | | | | | | | | | | | |  | | | |
 | 5:50 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | 5:50 |
 | — | — | — | — | 7:02 | — | — | — | — | — | — | — | 7:02 | — | — | — | — | — | — | — | 7:04 | — | — | 7:04 |
— | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 24 | 24 | 23 | 23 | 23 | 23 |
23 | 24 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 22 | 21 | 21 | 21 | 20 | 21 | 21 | 19 | 19 | 18 | 19 | |
Swell 1 Height (m) Direction Period (s) | NNW 9 | SSW 14 | SSW 14 | SSW 15 | SSW 16 | NW 12 | E 8 | NW 11 | NW 11 | NW 11 | NNW 12 | NNW 12 | NW 11 | NNW 11 | NW 11 | NNW 11 | NNW 12 | NNW 12 | NNW 10 | NNW 11 | NNW 11 | NNW 11 | NNW 11 | NNW 10 |
 kJ | 16 | 41 | 20 | 43 | 48 | 23 | 69 | 19 | 31 | 31 | 54 | 54 | 29 | 46 | 58 | 45 | 78 | 78 | 62 | 65 | 65 | 65 | 44 | 42 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | NNW 9 | NNW 13 | NNW 13 | NNW 12 | SSW 14 | NW 12 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | SSW 15 | SSW 15 | SSW 16 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | S 18 | S 16 |
| kJ | 20 | 8 | 18 | 17 | 15 | 18 | 36 | 18 | 18 | 39 | 40 | 20 | 59 | 42 | 44 | 47 | 41 | 41 | 41 | 20 | 19 | 18 | 24 | 21 |
Swell 3 Height (m) Direction Period (s) | NNW 15 | NNW 14 | NNW 9 | SSW 19 | NNW 9 | SSW 19 | SSW 14 | NNW 13 | SSW 17 | SSW 18 | SSW 18 | SSE 6 | NNW 12 | NNW 13 | NNW 13 | NNW 12 | SE 9 | SE 9 | S 18 | S 18 | S 18 | S 18 | SSW 13 | SSW 13 |
| kJ | 21 | 20 | 8 | 37 | 8 | 37 | 18 | 17 | 28 | 30 | 30 | 4 | 30 | 18 | 17 | 30 | 3 | 3 | 6 | 6 | 24 | 25 | 17 | 17 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | E 8 | E 8 | E 8 | E 8 | E 8 | ENE 8 | ENE 6 | ENE 6 | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 473 | 427 | 427 | 473 | 427 | 341 | 176 | 294 | 286 | 286 | 272 | 286 | 333 | 237 | 273 | 438 | 449 | 522 | 528 | 623 | 686 | 686 | 745 | 745 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 18 | 18 | 41 | 41 | 45 | 41 | 19 | 41 | 41 | 19 | 41 | 41 | 42 | 41 | 41 | 41 | 41 | 45 | 45 | 50 | 47 | 47 | 51 | 52 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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