Surf Forecasts:
Castles Beach surf forecast from 25 Oct 2026:
- Best quality surf: Saturday 31 Oct, 2PM (local time) - 3ft (0.9m), 8s period, NNE swell with cross-offshore winds.
- Most powerful swell: Sunday 1 Nov, 11AM (local time) - 5ft (1.6m), 8s period, NE swell with 306 kJ wave energy.
- Next surfable swell (1★+): Saturday 31 Oct, 2PM (local time) - 3ft (0.9m), 8s period with NNE 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 Saturday (Oct 31) at 2PM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.8m and 6s. 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 1.6m 8s and forecast to arrive on Sunday (Nov 01) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 18s period and expected on Sunday (Nov 01) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Sat 31st Oct) | 3ft (0.9m) 8s |
| Best Surf | 2PM (Sat 31st Oct) | 3ft (0.9m) 8s |
| Most Powerful | 11AM (Sun 1st Nov) | 5ft (1.6m) 8s |
Table - best surf conditions forecast for Castles Beach over the next 16 days.
Short Range ForecastHeavy rain (total 57mm), heaviest during Tue night. Warm (max 25°C on Sun afternoon, min 18°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 120mm), heaviest during Thu night. Warm (max 26°C on Fri afternoon, min 22°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 25 | Monday 26 | Tuesday 27 | Wednesday 28 | Thursday 29 | Friday 30 | Saturday 31 | |||||||||||||||
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) | E 7 | E 7 | E 7 | SSW 15 | S 15 | SSW 14 | SSW 13 | S 16 | S 15 | S 15 | NNE 9 | NNE 11 | NNE 11 | NNE 11 | NNE 10 | NNE 10 | NNE 9 | S 13 | NNE 8 | NNE 8 | NNE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 52 | 25 | 24 | 72 | 110 | 64 | 60 | 82 | 121 | 109 | 138 | 148 | 226 | 218 | 186 | 150 | 106 | 92 | 90 | 125 | 125 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross-on | on | on | cross | cross-on | on | cross-on | cross-on | on | on | on | on | on | cross-on | cross | cross-off | cross-off |
High Tide | 1:17PM0.61m | 2:50AM0.88m | 1:42PM0.57m | 3:32AM0.90m | 2:06PM0.53m | 4:20AM0.90m | 2:27PM0.49m | 5:13AM0.87m | 2:35PM0.46m | 6:16AM0.83m | 7:29AM0.79m | ||||||||||
Low Tide | 8:17AM0.33m | 7:41PM0.02m | 9:06AM0.36m | 8:10PM-0.00m | 9:59AM0.39m | 8:42PM-0.01m | 11:01AM0.42m | 9:18PM0.01m | 12:29PM0.44m | 9:56PM0.05m | 10:41PM0.12m | 11:41PM0.20m | |||||||||
 | |  | | | |  |  |  |  |  |  | | |  | |  |  | | | | |
 | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — | 6:33 | — | — |
 | — | 5:59 | — | — | 5:58 | — | — | 5:57 | — | — | 5:57 | — | — | 5:55 | — | — | 5:55 | — | — | 5:54 | — |
mm | — | — | — | — | — | — | — | 2 | 55 | 16 | 7 | 9 | 19 | 12 | 48 | 3 | 3 | 3 | — | — | 1 |
Temp °C | 24 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 21 | 22 | 23 | 23 | 23 | 24 | 24 | 24 | 26 | 26 | 27 | 27 | 26 |
Feels °C | 23 | 24 | 23 | 25 | 24 | 25 | 25 | 25 | 21 | 23 | 24 | 24 | 25 | 25 | 26 | 27 | 28 | 29 | 29 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | NNW 11 | NNW 11 | NNW 10 | N 10 | N 9 | N 10 | N 9 | N 9 | N 9 | N 10 | NNE 9 | NNE 9 | NNE 11 | NNE 11 | NNE 10 | NNE 10 | NNE 9 | NE 9 | NNE 8 | NNE 8 | NW 20 |
| kJ | 478 | 400 | 318 | 267 | 235 | 296 | 235 | 194 | 130 | 188 | 138 | 80 | 226 | 218 | 186 | 145 | 106 | 77 | 90 | 125 | 1922 |
Swell 2 Height (m) Direction Period (s) | E 7 | E 7 | NW 18 | NW 16 | NW 16 | NW 15 | NW 14 | NW 14 | NW 13 | NW 12 | NW 12 | NNE 11 | S 16 | S 16 | S 14 | S 14 | S 14 | S 13 | S 13 | NW 22 | NNE 8 |
| kJ | 25 | 25 | 164 | 395 | 508 | 566 | 521 | 363 | 286 | 181 | 114 | 148 | 183 | 178 | 140 | 150 | 100 | 92 | 55 | 683 | 125 |
Swell 3 Height (m) Direction Period (s) | NE 8 | NE 8 | E 7 | SSW 15 | S 15 | SSW 14 | SSW 13 | S 16 | S 15 | S 15 | NNE 12 | NW 12 | NW 11 | NW 11 | NW 11 | E 13 | E 13 | E 12 | E 12 | S 14 | S 15 |
| kJ | 24 | 23 | 24 | 72 | 110 | 64 | 60 | 82 | 121 | 109 | 111 | 114 | 59 | 58 | 29 | 53 | 51 | 49 | 46 | 93 | 109 |
Wind waves Height (m) Direction Period (s) | E 7 | — | — | — | — | — | — | — | — | E 4 | E 5 | E 5 | E 5 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | E 6 | E 7 |
| kJ | 52 | — | — | — | — | — | — | — | — | 10 | 44 | 52 | 52 | 42 | 83 | 62 | 62 | 69 | 40 | 50 | 73 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 18 | 16 | 16 | 18 | 18 | 18 | 16 | 18 | 18 | 18 | 18 | 13 | 13 | 9 | 16 | 13 | 13 | 1 | 0 | 0 |
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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