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Castles Beach Surf Forecast
/ HAW – Oahu (122 breaks) / Hawaii (267 breaks) /
Surf Forecasts:
Castles Beach surfForecast / HAW – Oahu / USA
16 Day Weather and Surf, issued 7 pm Wednesday 13 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)Best Forecast Surf Conditions for Castles Beach this week:
The most powerful waves expected at Castles Beach in the next 16 days are 2.3m 8s and forecast to arrive on Thursday (May 21) at 2AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 14s period and expected on Thursday (May 14) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Thu 21st May) | 7.5ft (2.3m) 8s |
Table - best surf conditions forecast for Castles Beach over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 32mm), heaviest during Fri afternoon. Warm (max 24°C on Wed night, min 20°C on Fri night). Winds decreasing (fresh winds from the ENE on Wed night, light winds from the SE by Fri morning). | Days 5-7 Weather SummarySome drizzle, heaviest during Sat night. Warm (max 25°C on Sun morning, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | Monday 18 | Tuesday 19 | Wed 20 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
ENE 7 | ENE 7 | ENE 7 | ENE 7 | ESE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 6 | ENE 6 | ENE 7 | |
326 | 270 | 247 | 168 | 163 | 308 | 322 | 322 | 322 | 256 | 326 | 333 | 428 | 334 | 374 | 286 | 259 | 280 | 188 | 280 | 337 | |
Wind (km/h) | |||||||||||||||||||||
on | on | on | on | cross-on | cross | on | on | on | on | on | on | on | on | on | on | on | cross-on | on | cross-on | cross-on | |
High Tide | 11:50PM0.61m | 1:42PM0.84m | 00:24AM0.57m | 2:24PM0.91m | 00:58AM0.53m | 3:09PM0.95m | 1:32AM0.50m | 3:56PM0.96m | 2:04AM0.47m | 4:46PM0.94m | 2:36AM0.44m | 5:38PM0.90m | 3:08AM0.41m | 6:33PM0.85m | |||||||
Low Tide | 6:29AM0.05m | 7:53PM0.39m | 7:00AM-0.00m | 8:51PM0.39m | 7:34AM-0.04m | 9:49PM0.39m | 8:11AM-0.05m | 10:51PM0.40m | 8:51AM-0.04m | 00:02AM0.41m | 9:32AM0.01m | 1:30AM0.40m | 10:16AM0.07m | ||||||||
 |  |  |  |  | |  | |  | | | |  | | | | | | | | | |
 | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:50 | — | — | 5:50 | — | — | 5:50 | — | — | 5:50 | — |
 | 7:00 | — | 7:00 | — | — | 7:01 | — | — | 7:01 | — | — | 7:02 | — | — | 7:02 | — | — | 7:02 | — | — | 7:04 |
— | 1 | — | 1 | 3 | 15 | 11 | 1 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
20 | 22 | 22 | 24 | 25 | 24 | 24 | 24 | 24 | 26 | 27 | 25 | 24 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 21 | |
Swell 1 Height (m) Direction Period (s) | NW 16 | NW 15 | NW 15 | NW 13 | NE 7 | NW 12 | ENE 8 | NW 11 | ENE 8 | ENE 8 | ENE 8 | NNW 10 | NNW 9 | SSW 14 | SSW 16 | NW 11 | NW 11 | SSW 17 | NNW 11 | NNW 10 | NNW 10 |
 kJ | 132 | 322 | 418 | 352 | 147 | 147 | 322 | 58 | 322 | 256 | 326 | 38 | 17 | 20 | 48 | 33 | 33 | 59 | 46 | 40 | 38 |
Swell 2 Height (m) Direction Period (s) | N 8 | N 8 | N 8 | ESE 8 | NW 13 | N 8 | NNW 11 | NNW 13 | NW 11 | NNW 10 | NNW 10 | SSW 15 | SSW 15 | NNW 9 | SSE 7 | SSW 13 | SSW 14 | NW 10 | SSW 15 | SSW 15 | SSW 14 |
| kJ | 22 | 22 | 22 | 85 | 230 | 12 | 84 | 17 | 58 | 42 | 41 | 44 | 42 | 8 | 5 | 18 | 40 | 16 | 42 | 42 | 19 |
Swell 3 Height (m) Direction Period (s) | NW 9 | NW 11 | S 12 | N 8 | N 8 | SSE 11 | NNW 15 | SSE 10 | SSW 16 | SSE 12 | SSW 15 | SSE 11 | SSE 10 | SSW 19 | NNW 13 | S 16 | SSW 18 | SSE 10 | SSE 9 | SSE 9 | S 18 |
| kJ | 12 | 19 | 11 | 22 | 11 | 12 | 21 | 11 | 26 | 13 | 44 | 11 | 10 | 37 | 16 | 21 | 30 | 9 | 8 | 8 | 24 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ESE 8 | ENE 8 | — | ENE 8 | — | — | — | ENE 8 | E 8 | E 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 6 | ENE 6 | ENE 7 |
| kJ | 326 | 270 | 247 | 168 | 163 | 308 | — | 322 | — | — | — | 333 | 428 | 334 | 374 | 286 | 259 | 280 | 188 | 280 | 337 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 41 | 41 | 41 | 18 | 13 | 18 | 18 | 41 | 18 | 18 | 18 | 18 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 49 |
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)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Castles Beach surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Castles Beach Surf forecast
The above surf forecast table for Castles Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Castles Beach can be found by selecting the local surf guide option on the grey menu. Our Castles Beach surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Castles Beach) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Castles Beach may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Castles is 2 km (1 miles) from Kailua. If you plan a vacation in Oahu, look for hotels and other accommodation in Kailua. Kailua has rooms for a wide range of budgets as well as car hire and transport links.
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