Surf Forecasts:
Castles Beach surf forecast from 14 Sep 2026:
- Most powerful swell: Friday 18 Sep, 2AM (local time) - 6.5ft (2.0m), 9s period, ENE swell with 603 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 2.0m 9s and forecast to arrive on Friday (Sep 18) 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 0.4m 18s period and expected on Wednesday (Sep 16) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Fri 18th Sep) | 6.5ft (2.0m) 9s |
Table - best surf conditions forecast for Castles Beach over the next 16 days.
Short Range ForecastSome drizzle, heaviest during Mon night. Warm (max 26°C on Mon afternoon, min 25°C on Sun afternoon). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Thu night. Warm (max 27°C on Fri afternoon, min 25°C on Wed night). Mainly fresh winds. | |||||||||||||||||||
Sun 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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) | NE 9 | NE 9 | NE 8 | NE 8 | ENE 5 | NNE 8 | E 12 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 9 | ENE 8 | ENE 8 | E 7 | E 7 | E 8 | E 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 112 | 123 | 82 | 196 | 51 | 39 | 44 | 62 | 97 | 131 | 191 | 389 | 482 | 603 | 461 | 383 | 358 | 329 | 383 | 355 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on |
High Tide | 3:16PM0.65m | 4:32AM0.72m | 3:26PM0.60m | 5:15AM0.70m | 3:27PM0.55m | 6:09AM0.67m | 3:00PM0.53m | 7:35AM0.64m | 9:58AM0.64m | 11:15AM0.68m | ||||||||||
Low Tide | 9:43PM0.13m | 10:23AM0.39m | 10:04PM0.13m | 11:06AM0.45m | 10:26PM0.15m | 12:06PM0.50m | 10:52PM0.18m | 11:26PM0.21m | 00:33AM0.25m | 3:03AM0.26m | ||||||||||
 |  | | |  |  | |  | | |  |  | | | | | | | |  | |
 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — |
mm | — | — | — | — | 1 | — | — | — | — | — | 3 | 2 | — | 6 | 2 | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 26 |
Feels °C | 25 | 26 | 25 | 26 | 26 | 28 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 27 | 26 | 26 | 25 | 26 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | NE 9 | NE 9 | NE 8 | SSW 22 | NE 8 | NNE 8 | NNE 8 | NNE 8 | E 10 | E 10 | E 10 | SSW 16 | SSW 19 | SSW 18 | SSW 17 | SW 17 | SSW 15 | SW 16 | S 18 | SSW 16 |
| kJ | 112 | 123 | 82 | 45 | 51 | 39 | 40 | 32 | 51 | 72 | 94 | 25 | 35 | 124 | 116 | 71 | 44 | 61 | 55 | 86 |
Swell 2 Height (m) Direction Period (s) | SW 15 | SSW 14 | SW 14 | SW 14 | NNE 10 | E 12 | E 12 | E 11 | SW 18 | SW 18 | SW 17 | SSW 19 | SSW 16 | SE 10 | SE 10 | SSE 8 | SSW 16 | S 18 | SSW 16 | SE 8 |
| kJ | 8 | 20 | 8 | 8 | 9 | 26 | 44 | 37 | 80 | 79 | 76 | 37 | 24 | 4 | 4 | 6 | 26 | 25 | 24 | 3 |
Swell 3 Height (m) Direction Period (s) | NW 13 | NW 12 | SE 8 | E 15 | E 13 | SW 20 | SSW 20 | SW 19 | N 10 | NNE 8 | S 11 | S 11 | SE 10 | NW 12 | NW 10 | S 21 | S 19 | S 6 | SSW 14 | S 13 |
| kJ | 7 | 6 | 2 | 4 | 14 | 60 | 37 | 95 | 7 | 14 | 2 | 2 | 4 | 6 | 4 | 9 | 29 | 1 | 19 | 3 |
Wind waves Height (m) Direction Period (s) | ENE 9 | E 4 | ENE 5 | NE 8 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 9 | ENE 8 | ENE 8 | E 7 | E 7 | E 8 | E 7 |
| kJ | 59 | 7 | 27 | 196 | 51 | 39 | 44 | 62 | 97 | 131 | 191 | 389 | 482 | 603 | 461 | 383 | 358 | 329 | 383 | 355 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 18 | 18 | 41 | 18 | 18 | 40 | 18 | 18 | 41 | 123 | 41 | 42 | 42 | 41 | 45 | 45 | 41 | 41 | 41 | 41 |
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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