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Castles Beach Surf Forecast
/ HAW – Oahu (122 breaks) / Hawaii (267 breaks) /
Surf Forecasts:
Castles Beach surfForecast / HAW – Oahu / USA
12 Day Weather and Surf, issued 7 am Monday 15 Sep 2025 HST
Best Forecast Surf Conditions for Castles Beach this week:
The most powerful waves expected at Castles Beach in the next 12 days are 1.9m 8s and forecast to arrive on Sunday (Sep 21) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 8s period and expected on Thursday (Sep 18) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Sun 21st Sep) | 6ft (1.9m) 8s |
Table - best surf conditions forecast for Castles Beach over the next 12 days.
Short Range Forecast Some drizzle, heaviest during Tue night. Warm (max 25°C on Mon morning, min 24°C on Mon night). Mainly fresh winds. | Days 3-6 Weather Summary Moderate rain (total 10mm), heaviest on Thu night. Warm (max 26°C on Sat afternoon, min 25°C on Thu morning). Mainly fresh winds. | ||||||||||||||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 8 | 8 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 8 | 8 | 8 | 9 |
Wave (?)Graph  | |||||||||||||||||||||
| Energy (?) | 184 | 97 | 110 | 114 | 124 | 189 | 146 | 149 | 256 | 196 | 158 | 225 | 152 | 314 | 372 | 367 | 376 | 487 | 479 | 448 | 398 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- on | cross- on | cross- on | cross- on | on | on | on | on | on | cross- on | cross- on | cross- on | cross- on | on | on | cross- on | on | on | on | on |
High Tide / height (m) | 11:22AM 0.77 | 12:09PM 0.80 | 11:31PM 0.40 | 12:44PM 0.82 | 12:23AM 0.47 | 1:13PM 0.82 | 1:03AM 0.54 | 1:37PM 0.80 | 1:39AM 0.60 | 1:58PM 0.77 | 2:13AM 0.66 | 2:17PM 0.73 | 2:46AM 0.70 | ||||||||
Low Tide / height (m) | 3:53AM 0.20 | 7:40PM 0.33 | 5:12AM 0.18 | 7:41PM 0.30 | 6:07AM 0.17 | 7:51PM 0.27 | 6:51AM 0.17 | 8:04PM 0.24 | 7:30AM 0.18 | 8:18PM 0.20 | 8:07AM 0.21 | 8:34PM 0.17 | |||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | |||||||||||||||
| Sunrise | 6:16 | - | - | 6:18 | - | - | 6:18 | - | - | 6:18 | - | - | 6:18 | - | - | 6:18 | - | - | 6:18 | - | - |
| Sunset | - | 6:34 | - | - | 6:32 | - | - | 6:31 | - | - | 6:30 | - | - | 6:30 | - | - | 6:29 | - | - | 6:28 | - |
 | |  | | |  | | |  | | |  | |  | | | | |  | | | |
Rain (mm) | - | - | - | - | - | 1 | - | - | - | - | - | 2 | - | - | 4 | - | - | 4 | 1 | - | - |
| Temp. °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 25 |
| Feels °C (?) | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 24 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 24 | 25 | 24 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for HAW - Oahu
Onshore wind has changed to cross-on at Castles Beach (moderate winds from the ENE at Kaneohe Bay Marine Corps Airfield Airport 3 km from Castles Beach). 0.9m 5s windswell from the E with a 0.2m 11s groundswell from the S and a 0.2m 14s groundswell from the SSW. 3 swells combining to make bigger set waves.
1 h 52 min ago
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 12 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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