Surf Forecasts:
Castles Beach surf forecast from 23 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 8AM (local time) - 10ft (3.0m), 11s period, ENE swell with glassy winds.
- Most powerful swell: Wednesday 29 Jul, 8AM (local time) - 10ft (3.0m), 11s period, ENE swell with 1,816 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 8AM (local time) - 10ft (3.0m), 11s period with ENE swell.
Best Forecast Surf Conditions for Castles Beach this week:
The surf forecast for Castles Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jul 29) at 8AM. The primary swell is predicted to be 3.0m and 11s period with a secondary swell of 0.3m and 14s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Castles Beach in the next 16 days are 3.0m 11s and forecast to arrive on Wednesday (Jul 29) at 8AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 10s period and expected on Thursday (Jul 30) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Wed 29th Jul) | 10ft (3.0m) 11s |
| Best Surf | 8AM (Wed 29th Jul) | 10ft (3.0m) 11s |
| Most Powerful | 8AM (Wed 29th Jul) | 10ft (3.0m) 11s |
Table - best surf conditions forecast for Castles Beach over the next 16 days.
Short Range ForecastLight rain (total 3mm), mostly falling on Fri morning. Warm (max 25°C on Thu morning, min 24°C on Sat night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Tue night. Warm (max 25°C on Sun morning, min 24°C on Mon morning). Mainly fresh winds. | ||||||||||||||||||||
Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | |||||||||||||||
AM | PM | 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 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | E 14 | E 14 | E 13 | ENE 13 | ENE 12 | E 13 | E 12 | ENE 10 | ENE 9 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 330 | 276 | 350 | 348 | 420 | 440 | 464 | 517 | 572 | 403 | 337 | 390 | 439 | 492 | 1387 | 1345 | 912 | 1098 | 1773 | 949 | 497 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on |
High Tide | 12:30PM0.71m | 1:05PM0.75m | 1:36PM0.79m | 11:19PM0.41m | 2:05PM0.83m | 00:19AM0.43m | 2:32PM0.85m | 1:04AM0.45m | 2:58PM0.86m | 1:44AM0.47m | 3:22PM0.87m | 2:24AM0.50m | |||||||||
Low Tide | 4:27AM0.17m | 5:23AM0.14m | 9:11PM0.40m | 6:10AM0.11m | 9:11PM0.38m | 6:50AM0.08m | 9:23PM0.37m | 7:26AM0.06m | 9:40PM0.35m | 7:59AM0.05m | 9:59PM0.33m | ||||||||||
 |  |  |  | | | | |  | | |  | | | | |  |  | | | | |
 | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — |
 | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:12 | — | — | 7:12 | — | — | 7:10 | — |
mm | — | — | — | 1 | — | — | — | — | 2 | 1 | — | — | — | — | — | — | 2 | 5 | 4 | 2 | 7 |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 27 | 26 |
Feels °C | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 22 | 22 | 24 | 23 | 22 | 23 | 25 | 25 | 24 | 31 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | S 12 | E 11 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | E 14 | SSW 19 | S 18 | E 14 | E 14 | E 14 | E 14 | E 13 | S 14 | S 14 | E 13 | E 12 | ENE 10 | ENE 9 | SSW 14 |
| kJ | 45 | 88 | 112 | 104 | 59 | 52 | 62 | 115 | 158 | 264 | 329 | 390 | 439 | 492 | 37 | 32 | 912 | 1098 | 1773 | 949 | 66 |
Swell 2 Height (m) Direction Period (s) | SSW 20 | S 13 | S 11 | S 12 | S 12 | S 12 | SSW 19 | E 13 | E 15 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | NE 10 | — | SSE 10 | S 14 | S 13 | S 15 | S 14 | SW 19 |
| kJ | 77 | 55 | 20 | 46 | 25 | 25 | 125 | 55 | 72 | 90 | 85 | 83 | 73 | 49 | — | 9 | 33 | 30 | 68 | 64 | 15 |
Swell 3 Height (m) Direction Period (s) | NNW 10 | SSW 20 | S 13 | NNW 9 | SSW 21 | E 15 | SSW 16 | S 11 | E 12 | S 10 | — | S 10 | S 10 | SSW 15 | S 18 | S 16 | SE 8 | S 15 | — | S 20 | S 13 |
| kJ | 10 | 75 | 31 | 8 | 44 | 42 | 50 | 10 | 47 | 8 | — | 2 | 8 | 42 | 6 | 5 | 3 | 18 | — | 7 | 4 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | NE 7 | ENE 7 | ENE 13 | ENE 12 | NNE 9 | NNE 7 | — | SSE 4 | ENE 8 |
| kJ | 330 | 276 | 350 | 348 | 420 | 440 | 464 | 517 | 572 | 403 | 337 | 343 | 261 | 274 | 1387 | 1345 | 318 | 198 | — | 6 | 497 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 45 | 47 | 41 | 47 | 51 | 41 | 42 | 123 | 41 | 45 | 45 | 41 | 41 | 42 | 41 | 18 | 41 | 18 | 42 | 42 | 21 |
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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