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Surf Forecasts:
Castles surfForecast / Okinawa / Japan
16 Day Weather and Surf, issued 8 am Sunday 22 Mar 2026 JSTForecast update in hr min s Forecast update imminent
Castles surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castles sea temperature is
21.6° C
(Which is 1.2°C colder than average for this time of year)Best Forecast Surf Conditions for Castles this week:
The surf forecast for Castles over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Mar 23) at 3AM. The primary swell is predicted to be 0.6m and 13s period with a secondary swell of 0.6m and 5s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Castles in the next 16 days are 1.0m 11s and forecast to arrive on Sunday (Mar 29) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Wednesday (Mar 25) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 23rd Mar) | 2ft (0.6m) 13s |
| Best Surf | 3AM (Mon 23rd Mar) | 2ft (0.6m) 13s |
| Most Powerful | 6AM (Sun 29th Mar) | 3.5ft (1.0m) 11s |
Table - best surf conditions forecast for Castles over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Light rain (total 6mm), mostly falling on Mon afternoon. Warm (max 22°C on Tue afternoon, min 19°C on Mon night). Wind will be generally light. | Days 3-6 Weather Summary Moderate rain (total 11mm), heaviest on Wed morning. Warm (max 21°C on Wed morning, min 18°C on Wed night). Winds decreasing (fresh winds from the SW on Wed morning, light winds from the NE by Thu night). | ||||||||||||||||||||
Sunday 22 | Monday 23 | Tuesday 24 | Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | |||||||||||||||
| 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) (?) | 15 | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 8 | 8 | 8 | 8 | 10 | 10 | 8 | 10 | 10 | 11 | 10 | 10 | 10 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 85 | 136 | 118 | 83 | 63 | 56 | 37 | 42 | 51 | 34 | 35 | 35 | 40 | 39 | 54 | 39 | 110 | 204 | 182 | 175 | 212 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross | glass | off | cross | cross- on | on | cross | cross | off | cross- off | cross- off | cross- off | cross | cross- on | cross- on | cross | cross- off | cross | cross- on |
High Tide / height (m) | 9:35PM 1.79 | 9:08AM 1.89 | 10:25PM 1.61 | 9:41AM 1.82 | 11:29PM 1.42 | 10:21AM 1.71 | 1:08AM 1.29 | 11:20AM 1.58 | 3:21AM 1.30 | 1:10PM 1.49 | 4:31AM 1.41 | 3:14PM 1.53 | |||||||||
Low Tide / height (m) | 3:11PM -0.04 | 3:20AM 0.59 | 3:55PM 0.03 | 3:54AM 0.78 | 4:47PM 0.15 | 4:31AM 0.95 | 5:52PM 0.28 | 5:28AM 1.09 | 7:23PM 0.38 | 7:30AM 1.15 | 9:04PM 0.39 | 9:34AM 1.03 | 10:18PM 0.33 | ||||||||
Sunday 22 | Monday 23 | Tuesday 24 | Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | |||||||||||||||
| Sunrise | 6:31 | - | - | 6:31 | - | - | 6:30 | - | - | 6:28 | - | - | 6:26 | - | - | 6:26 | - | - | 6:24 | - | - |
| Sunset | - | 6:40 | - | - | 6:40 | - | - | 6:40 | - | - | 6:42 | - | - | 6:42 | - | - | 6:43 | - | - | 6:43 | - |
 | |  |  |  |  |  | | |  | |  | | | | | | | | | | |
Rain (mm) | - | - | - | 1 | 4 | 1 | - | - | - | 4 | 1 | - | - | - | - | - | 2 | 4 | - | - | - |
| Temp. °C | 21 | 21 | 21 | 21 | 20 | 20 | 21 | 22 | 21 | 21 | 21 | 19 | 20 | 20 | 18 | 19 | 20 | 18 | 20 | 20 | 20 |
| Feels °C (?) | 20 | 19 | 21 | 23 | 22 | 19 | 22 | 23 | 21 | 19 | 19 | 16 | 17 | 17 | 15 | 17 | 18 | 16 | 17 | 16 | 17 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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 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 Surf forecast
The above surf forecast table for Castles provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Castles can be found by selecting the local surf guide option on the grey menu. Our Castles 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) 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 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 6 km (4 miles) from the city of Itoman. If you plan a holiday in Okinawa, look for hotels and other accommodation in Itoman. Itoman has rooms for a wide range of budgets as well as car hire and transport links.
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