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Surf Forecasts:
Castles surfForecast / Okinawa / Japan
48hr Weather and Surf, issued 2 pm Monday 18 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
23.8° C
(Which is 1.9°C colder than average for this time of year)How big are the waves at Castles today?
The current surf forecast for Castles at 9PM is: 2.1m 9s primary swell from a East direction (forecast issued at 02:00pm May 18). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | - | - |
| Afternoon (18 May) | 6.5ft (2.0m) | 9s |
| Evening (18 May) | 7ft (2.1m) | 9s |
Table - waves today at Castles. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 5mm), mostly falling on Mon night. Warm (max 25°C on Tue morning, min 22°C on Mon afternoon). Winds decreasing (fresh winds from the ENE on Mon night, calm by Tue morning). | ||||||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
E 9 | E 9 | E 9 | E 9 | E 9 | E 8 | E 8 | E 9 | E 9 | E 9 | E 8 | E 8 | E 9 | E 9 | E 9 | ESE 9 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | |
670 | 607 | 670 | 656 | 641 | 691 | 568 | 470 | 470 | 421 | 364 | 364 | 340 | 339 | 339 | 318 | 334 | 327 | 283 | 283 | 289 | 235 | 248 | 235 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross | cross | cross-on | cross-on | cross | cross | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | |
High Tide | 8:43PM1.95m | 7:51AM2.14m | 9:35PM1.86m | 8:35AM2.06m | 10:29PM1.75m | |||||||||||||||||||
Low Tide | 2:02PM-0.19m | 2:10AM0.85m | 2:49PM-0.12m | 2:55AM0.93m | 3:39PM0.01m | 3:44AM1.01m | ||||||||||||||||||
 |  | |  | |  |  | | | | | |  | | |  | | | | | | | | | |
 | — | — | — | — | — | 5:41 | — | — | — | — | — | — | — | 5:41 | — | — | — | — | — | — | — | 5:39 | — | — |
 | — | — | 7:08 | — | — | — | — | — | — | — | 7:09 | — | — | — | — | — | — | — | 7:09 | — | — | — | — | 7:10 |
— | — | — | — | — | 2 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 23 | 22 | 22 | 22 | 23 | 24 | 24 | 24 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 24 |
21 | 20 | 20 | 20 | 22 | 24 | 26 | 27 | 29 | 28 | 27 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 26 | 26 | 24 | 25 | 25 | 25 | |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | E 8 | E 8 | E 9 | E 9 | E 9 | E 8 | E 8 | E 9 | E 9 | E 9 | ESE 9 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 |
 kJ | — | — | — | — | — | 691 | 568 | 470 | 470 | 421 | 364 | 364 | 340 | 339 | 339 | 318 | 334 | 327 | 283 | 283 | 289 | 235 | 248 | 235 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | ENE 8 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 169 | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 7 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 9 | E 9 | — | — | — | — | — | — | — | — | — | WSW 3 | SW 3 | WSW 3 | SW 3 | SW 3 | SW 3 | SW 4 | SSW 3 | SW 4 | SW 4 |
| kJ | 670 | 607 | 670 | 656 | 641 | — | — | — | — | — | — | — | — | — | 1 | 2 | 1 | 2 | 3 | 3 | 3 | 4 | 8 | 10 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 29 | 29 | 29 | 605 | 29 | 29 | 29 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16 | 94 | 94 | 16 | 19 | 48 | 16 | 16 | 94 |
Best forecast wave conditions in Okinawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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