Surf Forecasts:
Castles Beach surf forecast from 3 Aug 2026:
- Most powerful swell: Tuesday 4 Aug, 5AM (local time) - 5ft (1.5m), 12s period, ENE swell with 612 kJ wave energy.
Best Forecast Surf Conditions for Castles Beach this week:
The most powerful waves expected at Castles Beach in the next 16 days are 1.5m 12s and forecast to arrive on Tuesday (Aug 04) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 6s period and expected on Monday (Aug 03) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Tue 4th Aug) | 5ft (1.5m) 12s |
Table - best surf conditions forecast for Castles Beach over the next 16 days.
Short Range ForecastLight rain (total 7mm), mostly falling on Sun night. Warm (max 26°C on Mon morning, min 25°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Wed night. Warm (max 25°C on Wed night, min 25°C on Wed night). Mainly fresh winds. | ||||||||||||||||||
Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 5 | ENE 6 | E 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 512 | 318 | 331 | 329 | 540 | 460 | 411 | 295 | 237 | 90 | 59 | 46 | 32 | 97 | 67 | 245 | 233 | 219 | 277 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on |
High Tide | 5:34AM0.57m | 5:00PM0.69m | 6:49AM0.58m | 5:12PM0.63m | 8:35AM0.61m | 5:05PM0.58m | 10:38AM0.68m | 11:52AM0.77m | 12:41PM0.84m | 9:57PM0.40m | |||||||||
Low Tide | 11:29PM0.22m | 10:50AM0.35m | 00:00AM0.19m | 11:41AM0.45m | 00:39AM0.17m | 1:20PM0.54m | 1:33AM0.15m | 2:46AM0.13m | 4:07AM0.10m | 8:55PM0.40m | |||||||||
 |  |  | | |  |  | | | |  | | |  | | | | | | |
 | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — |
 | 7:08 | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:06 | — |
mm | 2 | 1 | — | 3 | 1 | — | — | — | — | 2 | 2 | — | — | — | — | 1 | — | — | 2 |
Temp °C | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 23 | 26 | 26 | 25 | 28 | 28 | 27 | 26 | 27 | 25 | 26 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | E 13 | N 6 | E 12 | E 12 | ENE 11 | SSW 12 | ENE 10 | ENE 10 | NNE 8 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | NE 10 | NNW 7 | NE 11 | NE 10 | NE 10 | NE 9 |
| kJ | 87 | 25 | 76 | 101 | 540 | 13 | 411 | 295 | 7 | 90 | 59 | 43 | 32 | 23 | 9 | 41 | 28 | 17 | 31 |
Swell 2 Height (m) Direction Period (s) | N 8 | E 13 | N 7 | SSW 12 | SSE 14 | SSE 13 | S 13 | NNE 9 | S 12 | S 12 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | ENE 12 | N 7 | N 6 | N 6 | SSW 13 |
| kJ | 12 | 84 | 4 | 14 | 21 | 16 | 14 | 8 | 12 | 11 | 7 | 11 | 10 | 10 | 14 | 8 | 3 | 3 | 17 |
Swell 3 Height (m) Direction Period (s) | SSW 13 | N 8 | SSW 12 | S 13 | SSW 12 | N 10 | NNE 9 | S 13 | SSW 11 | NNE 8 | S 12 | S 11 | S 11 | S 11 | S 11 | S 11 | SSW 14 | SSW 14 | N 6 |
| kJ | 17 | 10 | 15 | 3 | 14 | 8 | 8 | 13 | 11 | 6 | 11 | 10 | 9 | 9 | 9 | 9 | 20 | 19 | 3 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | — | ENE 11 | — | — | ENE 9 | ENE 6 | ENE 5 | ENE 5 | ENE 5 | ENE 7 | ENE 5 | ENE 6 | E 7 | ENE 7 | ENE 7 |
| kJ | 512 | 318 | 331 | 329 | — | 460 | — | — | 237 | 80 | 46 | 46 | 24 | 97 | 67 | 245 | 233 | 219 | 277 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 42 | 42 | 45 | 18 | 18 | 18 | 18 | 41 | 18 | 18 | 41 | 41 | 18 | 41 | 45 | 41 | 41 | 42 | 41 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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