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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 Tuesday 09 Dec 2025 HSTForecast update in hr min s Forecast update imminent
Castles Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castles Beach sea temperature is
25.7° C
(Which is slightly warmer than usual)Best Forecast Surf Conditions for Castles Beach this week:
The surf forecast for Castles Beach over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Dec 10) at 5AM. The primary swell is predicted to be 0.7m and 8s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Castles Beach in the next 12 days are 0.9m 15s and forecast to arrive on Monday (Dec 15) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 16s period and expected on Wednesday (Dec 10) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 10th Dec) | 2.5ft (0.7m) 8s |
| Best Surf | 2PM (Mon 15th Dec) | 3ft (0.9m) 15s |
| Most Powerful | 2PM (Mon 15th Dec) | 3ft (0.9m) 15s |
Table - best surf conditions forecast for Castles Beach over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Light rain (total 3mm), mostly falling on Tue morning. Warm (max 25°C on Wed afternoon, min 22°C on Wed morning). Wind will be generally light. | Days 3-6 Weather Summary Light rain (total 8mm), mostly falling on Sun night. Warm (max 26°C on Sat afternoon, min 23°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 09 | Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | |||||||||||||||
| 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 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 8 | 8 | 8 | 8 | 8 | 4 | 8 | 18 | 15 | 6 | 6 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 96 | 77 | 58 | 55 | 57 | 55 | 42 | 42 | 30 | 30 | 30 | 31 | 32 | 31 | 20 | 2 | 28 | 62 | 0 | 62 | 72 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- on | cross- on | cross- off | glass | off | cross- off | cross | cross- on | on | cross- on | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross- on |
High Tide / height (m) | 5:21PM 0.38 | 7:02AM 0.76 | 7:44PM 0.38 | 7:40AM 0.70 | 10:27PM 0.46 | 8:16AM 0.64 | 11:45PM 0.56 | 8:52AM 0.58 | 12:23AM 0.64 | 9:32AM 0.53 | 12:54AM 0.72 | 10:18AM 0.49 | 1:24AM 0.78 | ||||||||
Low Tide / height (m) | 2:13PM 0.34 | 11:00PM 0.23 | 3:00PM 0.31 | 11:47PM 0.34 | 3:36PM 0.27 | 1:18AM 0.44 | 4:07PM 0.23 | 4:01AM 0.50 | 4:35PM 0.20 | 6:10AM 0.50 | 5:02PM 0.16 | 7:28AM 0.47 | 5:32PM 0.13 | ||||||||
Tuesday 09 | Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | |||||||||||||||
| Sunrise | 6:56 | - | - | 6:56 | - | - | 6:58 | - | - | 6:58 | - | - | 6:58 | - | - | 7:00 | - | - | 7:00 | - | - |
| Sunset | - | 5:49 | - | - | 5:49 | - | - | 5:49 | - | - | 5:50 | - | - | 5:50 | - | - | 5:50 | - | - | 5:51 | - |
 |  |  |  | | | | |  | | | | | |  | |  | |  | |  | |
Rain (mm) | 1 | - | - | - | - | - | - | 2 | - | - | - | - | - | - | 2 | - | 1 | 5 | 7 | 8 | 8 |
| Temp. °C | 24 | 24 | 24 | 24 | 25 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 25 | 26 | 24 | 25 | 26 | 24 | 24 | 24 | 24 |
| Feels °C (?) | 25 | 25 | 26 | 25 | 26 | 25 | 25 | 24 | 24 | 24 | 24 | 25 | 24 | 24 | 25 | 26 | 25 | 26 | 25 | 25 | 22 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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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.
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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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