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Surf Forecasts:

Castles surfForecast / Okinawa / Japan

information circle12 Day Weather and Surf, issued 2 am Tuesday 16 Sep 2025 JST
Forecast 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
29.9° C
 (Which is 1.6°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Castles this week:

The surf forecast for Castles over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 23) at 12AM. The primary swell is predicted to be 7.5m and 15s period with a secondary swell of 7.0m and 15s. The wind is predicted to be cross-onshore as the swell arrives.

The most powerful waves expected at Castles in the next 12 days are 12.0m 14s and forecast to arrive on Tuesday (Sep 23) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Sunday (Sep 21) at 3PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Tue 23rd Sep)25ft (7.5m) 15s
Best Surf12AM (Tue 23rd Sep)25ft (7.5m) 15s
Most Powerful 9AM (Tue 23rd Sep)39ft (12.0m) 14s

Table - best surf conditions forecast for Castles over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Light rain (total 5mm), mostly falling on Tue night. Warm (max 29°C on Tue morning, min 28°C on Tue night). Wind will be generally light.

Days 3-6 Weather Summary Moderate rain (total 11mm), heaviest on Sun night. Warm (max 29°C on Fri morning, min 28°C on Fri morning). Winds increasing (light winds from the ESE on Fri night, fresh winds from the NE by Sun afternoon).

Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
4
0
0
!
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.9
ESE
0.9
ESE
0.9
ESE
0.8
SE
0.8
SE
0.5
E
0.9
SE
0.9
SE
0.9
ESE
0.8
ESE
0.7
ESE
0.7
ESE
0.6
ESE
0.4
ESE
1
ENE
1.7
ESE
3
ESE
4
E
5
E
5
E
7.5
ENE
Period(s) (?)77766966710109975141314141415
Wave
Graph
(?)Metric surfscale
Energy (?)138109127908795142127116169107956642921162288967899783960346960
Wind
(km/h)
20
ESE
15
ESE
20
SE
15
SE
10
SE
15
ESE
10
ESE
15
E
15
E
15
ESE
15
ESE
15
ESE
15
E
15
ENE
20
ENE
30
NE
35
NE
30
ENE
40
ENE
45
ENE
50
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
oncross-
on		ononononcross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		crosscrosscrosscrosscrosscrosscross-
on		cross-
on
High Tide
/ height (m)
4:14PM
1.57
1:58AM
1.73
5:09PM
1.68
3:48AM
1.80
5:43PM
1.79
4:58AM
1.93
6:11PM
1.89
5:50AM
2.05
6:37PM
1.97
6:33AM
2.13
7:02PM
2.04
7:13AM
2.16
7:27PM
2.09
Low Tide
/ height (m)
8:25PM
1.42
9:46AM
0.59
10:11PM
1.27
10:51AM
0.51
11:08PM
1.07
11:38AM
0.45
11:50PM
0.86
12:17PM
0.42
12:27AM
0.66
12:51PM
0.43
1:01AM
0.51
1:22PM
0.48
1:35AM
0.41
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Sunrise6:13--6:15--6:15--6:16--6:16--6:16--6:16--
Sunset-6:32--6:31--6:30--6:30--6:29--6:27--6:25-
clear
clear
rain showers
cloud
part cloud
rain showers
part cloud
cloud
thunderstorm
part cloud
thunderstorm
clear
part cloud
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
Rain (mm)
--1--1--3-2--11115255
Temp. °C292929292929292928292929292929292928292828
Feels °C (?)313132323332323230323231323130292827282525
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Okinawa

  1. weather stationWind Update The wind is still cross-on at Castles (light winds from the E at Naha Airport 11 km from Castles). 0.7m 7s swell from the ESE with a 0.2m 14s groundswell from the E. 2 swells combining to make bigger set waves.

    1 hour 58 minutes ago Castles
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1 h 58 min ago

11 km/h
E
Cross-On
Please reload the page to see if there are any updates.

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.

View detailed surf forecast for Castles at:
surf-forecast.com

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 12 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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