Surf Forecasts:
Castles Beach surf forecast from 9 Oct 2026:
- Best quality surf: Friday 9 Oct, 5AM (local time) - 4ft (1.2m), 6s period, S swell with cross-offshore winds.
- Most powerful swell: Sunday 11 Oct, 5AM (local time) - 2ft (0.6m), 18s period, S swell with 221 kJ wave energy.
- Next surfable swell (1★+): Friday 9 Oct, 5AM (local time) - 4ft (1.2m), 6s period with S 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 Friday (Oct 09) at 5AM. The primary swell is predicted to be 1.2m and 6s period with a secondary swell of 0.7m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Castles Beach in the next 16 days are 0.6m 18s and forecast to arrive on Sunday (Oct 11) at 5AM. 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 11s period and expected on Saturday (Oct 10) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Fri 9th Oct) | 4ft (1.2m) 6s |
| Best Surf | 5AM (Fri 9th Oct) | 4ft (1.2m) 6s |
| Most Powerful | 5AM (Sun 11th Oct) | 2ft (0.6m) 18s |
Table - best surf conditions forecast for Castles Beach over the next 16 days.
Short Range ForecastLight rain (total 5mm), mostly falling on Thu night. Warm (max 27°C on Fri morning, min 24°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Tue afternoon, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 9 | Saturday 10 | Sunday 11 | Monday 12 | Tuesday 13 | Wednesday 14 | ||||||||||||||
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) | S 6 | S 6 | S 16 | E 13 | S 20 | S 20 | S 18 | S 18 | S 16 | S 16 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | E 7 | ENE 9 | NE 9 | NE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 153 | 62 | 134 | 84 | 119 | 119 | 154 | 97 | 81 | 125 | 113 | 127 | 123 | 142 | 168 | 139 | 58 | 81 | 74 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | cross-on | on |
High Tide | 1:50AM0.72m | 1:30PM0.69m | 2:26AM0.78m | 1:50PM0.64m | 3:00AM0.81m | 2:09PM0.60m | 3:34AM0.82m | 2:24PM0.55m | 4:10AM0.80m | 2:35PM0.52m | 4:49AM0.77m | 2:35PM0.49m | |||||||
Low Tide | 7:45AM0.27m | 7:49PM0.11m | 8:27AM0.30m | 8:09PM0.09m | 9:08AM0.33m | 8:29PM0.08m | 9:48AM0.37m | 8:51PM0.08m | 10:30AM0.41m | 9:14PM0.09m | 11:21AM0.45m | 9:38PM0.12m | |||||||
 |  | |  |  | |  |  | | | | | | | |  | | | | |
 | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — |
 | 6:12 | — | 6:10 | — | — | 6:09 | — | — | 6:08 | — | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — |
mm | 3 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 27 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 27 | 29 | 28 | 28 | 25 | 25 | 25 | 25 | 25 | 26 | 27 | 26 | 26 | 25 | 27 | 25 | 25 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | NNW 11 | NNW 10 | NNW 11 | NNW 11 | NNW 10 | NNW 10 | NNW 10 | E 12 | E 12 | ENE 6 | ENE 8 | ENE 8 | ENE 8 | E 8 | NW 14 | NW 14 | NW 13 | NW 13 | NNW 12 |
| kJ | 200 | 192 | 196 | 286 | 206 | 114 | 54 | 75 | 72 | 47 | 113 | 127 | 123 | 142 | 476 | 418 | 400 | 388 | 260 |
Swell 2 Height (m) Direction Period (s) | SSE 6 | E 6 | E 6 | E 13 | E 13 | E 12 | S 18 | NNW 9 | S 16 | E 12 | NNW 18 | NNW 16 | NW 16 | NW 15 | S 13 | NE 9 | ENE 9 | NE 9 | NE 8 |
| kJ | 55 | 41 | 28 | 84 | 84 | 76 | 154 | 28 | 81 | 72 | 209 | 343 | 483 | 489 | 31 | 41 | 53 | 81 | 74 |
Swell 3 Height (m) Direction Period (s) | E 7 | SSE 6 | S 16 | SSW 16 | S 20 | S 20 | E 12 | S 18 | NNW 9 | S 16 | ENE 12 | S 15 | S 14 | S 13 | NE 10 | S 13 | S 12 | S 12 | S 12 |
| kJ | 33 | 23 | 134 | 82 | 119 | 119 | 73 | 97 | 16 | 125 | 46 | 67 | 64 | 31 | 26 | 29 | 24 | 25 | 25 |
Wind waves Height (m) Direction Period (s) | S 6 | S 6 | — | E 6 | E 6 | E 6 | E 6 | ENE 6 | ENE 6 | — | — | — | — | — | E 8 | E 7 | E 5 | E 5 | E 5 |
| kJ | 153 | 62 | — | 52 | 89 | 76 | 78 | 50 | 55 | — | — | — | — | — | 168 | 139 | 58 | 47 | 50 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 1 | 13 | 18 | 41 | 41 | 18 | 41 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 18 | 41 | 18 | 18 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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