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Surf Forecasts:
Castles surfForecast / Okinawa / Japan
16 Day Weather and Surf, issued 8 am Sunday 31 May 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
26.1° C
(Which is normal for this time of year)Castles surf forecast from 31 May 2026:
- Best quality surf: Monday 1 Jun, 6AM (local time) - 20ft (6.0m), 14s period, SSE swell with cross-onshore winds.
- Most powerful swell: Monday 1 Jun, 6PM (local time) - 34ft (10.5m), 14s period, SE swell with 41,278 kJ wave energy.
- Next surfable swell (1★+): Monday 1 Jun, 6AM (local time) - 20ft (6.0m), 14s period with SSE swell.
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 (Jun 01) at 6AM. The primary swell is predicted to be 6.0m and 14s period with a secondary swell of 4.0m and 9s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Castles in the next 16 days are 10.5m 14s and forecast to arrive on Monday (Jun 01) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 7.0m 11s period and expected on Tuesday (Jun 02) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 1st Jun) | 20ft (6.0m) 14s |
| Best Surf | 6AM (Mon 1st Jun) | 20ft (6.0m) 14s |
| Most Powerful | 6PM (Mon 1st Jun) | 34ft (10.5m) 14s |
Table - best surf conditions forecast for Castles over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 109mm), heaviest during Mon afternoon. Warm (max 27°C on Sun afternoon, min 25°C on Sun morning). Winds decreasing (stormy winds from the SE on Mon afternoon, light winds from the W by Tue night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Warm (max 28°C on Fri afternoon, min 25°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 31 | Monday 1 | Tuesday 2 | Wednesday 3 | Thursday 4 | Friday 5 | Saturday 6 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
SSE 14 | SSE 15 | SSE 14 | SE 14 | SE 14 | S 12 | SSE 11 | SSE 9 | SSE 8 | SSE 7 | SSE 7 | S 7 | S 6 | SSE 6 | S 7 | S 8 | S 8 | S 8 | ENE 9 | E 9 | S 8 | |
3613 | 7260 | 9274 | 24173 | 38405 | 11762 | 571 | 336 | 165 | 134 | 96 | 45 | 31 | 33 | 57 | 266 | 270 | 190 | 28 | 27 | 93 | |
Wind (km/h) | |||||||||||||||||||||
cross | cross | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross-off | cross-off | glassy | on | on | cross-on | |
High Tide | 7:48PM1.81m | 6:43AM2.02m | 8:23PM1.79m | 7:14AM2.01m | 8:57PM1.77m | 7:45AM1.98m | 9:31PM1.74m | 8:18AM1.94m | 10:05PM1.71m | 8:55AM1.88m | 10:41PM1.68m | 9:40AM1.80m | 11:20PM1.67m | ||||||||
Low Tide | 1:06PM0.11m | 1:04AM0.98m | 1:40PM0.10m | 1:38AM1.00m | 2:14PM0.13m | 2:11AM1.03m | 2:48PM0.18m | 2:45AM1.05m | 3:22PM0.25m | 3:23AM1.06m | 3:59PM0.34m | 4:06AM1.06m | 4:40PM0.45m | ||||||||
 | |  |  |  |  | | |  | |  |  | | | | | | | | | | |
 | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — |
 | — | 7:15 | — | — | 7:15 | — | — | 7:16 | — | — | 7:16 | — | — | 7:17 | — | — | 7:17 | — | — | 7:19 | — |
— | — | 15 | 12 | 53 | 25 | 4 | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | |
Temp °C | 25 | 27 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 28 | 26 | 27 | 27 | 27 |
24 | 25 | 22 | 18 | 15 | 27 | 20 | 24 | 28 | 30 | 30 | 30 | 30 | 30 | 29 | 31 | 32 | 31 | 31 | 31 | 32 | |
Swell 1 Height (m) Direction Period (s) | SSE 14 | SSE 15 | SSE 14 | — | — | E 10 | SSE 11 | SSE 9 | SSE 8 | SSE 7 | SSE 7 | S 7 | S 6 | SSE 6 | S 7 | S 8 | S 8 | S 8 | SSW 9 | SSW 8 | S 8 |
 kJ | 3613 | 7260 | 9274 | — | — | 753 | 571 | 336 | 165 | 134 | 96 | 45 | 31 | 33 | 57 | 266 | 270 | 190 | 276 | 284 | 93 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | ESE 9 | SSW 9 | NNW 9 | NNW 9 | N 9 | N 8 | N 8 | E 10 | SW 5 | E 9 | E 9 | ENE 9 | SE 5 | E 9 | SW 8 |
| kJ | — | — | — | — | — | — | 188 | 194 | 113 | 115 | 60 | 35 | 20 | 16 | 5 | 27 | 27 | 28 | 10 | 27 | 54 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | ESE 11 | SW 7 | W 6 | ENE 10 | SE 6 | E 10 | N 7 | E 10 | W 5 | W 7 | W 6 | ENE 9 | W 5 | E 10 |
| kJ | — | — | — | — | — | — | — | 88 | 44 | 15 | 32 | 10 | 17 | 10 | 16 | 2 | 8 | 7 | 28 | 2 | 28 |
Wind waves Height (m) Direction Period (s) | ENE 5 | — | E 8 | SE 14 | SE 14 | S 12 | WSW 9 | W 8 | W 6 | — | — | — | — | SSW 4 | — | — | — | — | — | — | WNW 3 |
| kJ | 63 | — | 1051 | 24173 | 38405 | 11762 | 3321 | 776 | 64 | — | — | — | — | 9 | — | — | — | — | — | — | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 29 | 1012 | 596 | 713 | 596 | 596 | 596 | 770 | 16 | 5 | 0 | 16 | 17 | 94 | 106 | 0 | 0 | 0 | 28 | 28 | 28 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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 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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