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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 am Sunday 10 May 2026 JSTForecast update in hr min s Forecast update imminent
Rock Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Rock Island sea temperature is
20.7° C
(Which is slightly warmer than usual)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 3PM is: 0.6m 6s primary swell from a South-southeast direction and 0.2m 9s secondary swell from a East-southeast direction, 0.1m 6s secondary swell from a West direction (forecast issued at 08:00am May 10). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (10 May) | 1ft (0.3m) | 10s |
| Afternoon (10 May) | 2ft (0.6m) | 6s |
| Evening (10 May) | 3.5ft (1.1m) | 7s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 3mm), mostly falling on Sun night. Very mild (max 19°C on Mon afternoon, min 16°C on Tue night). Winds decreasing (fresh winds from the S on Mon afternoon, calm by Tue night). | ||||||||||||||||||||||||
Sunday 10 | Monday 11 | Tuesday 12 | Wed 13 | |||||||||||||||||||||
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 | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SE 10 | SE 10 | SE 10 | SSE 6 | SSE 6 | SE 7 | SSE 6 | SSE 6 | S 6 | S 5 | S 5 | S 4 | S 4 | SE 10 | SSE 8 | SSE 9 | SSE 9 | SSE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 11 | |
17 | 16 | 15 | 22 | 51 | 100 | 47 | 56 | 39 | 29 | 26 | 20 | 21 | 51 | 47 | 86 | 68 | 50 | 67 | 50 | 39 | 41 | 42 | 56 | |
Wind (km/h) | ||||||||||||||||||||||||
off | cross-off | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | glassy | |
High Tide | 9:58AM1.08m | 00:56AM1.20m | 11:56AM1.05m | 1:36AM1.22m | 1:36PM1.09m | 2:10AM1.25m | ||||||||||||||||||
Low Tide | 5:29AM0.93m | 5:26PM0.37m | 6:54AM0.81m | 6:38PM0.46m | 7:52AM0.65m | 7:43PM0.53m | ||||||||||||||||||
 |  | | | |  |  | |  | | | | |  | | | | | | | | | | | |
 | 4:41 | — | — | — | — | — | — | 4:41 | — | — | — | — | — | — | — | 4:39 | — | — | — | — | — | — | — | 4:39 |
 | — | — | — | — | 6:34 | — | — | — | — | — | — | — | 6:35 | — | — | — | — | — | — | — | 6:35 | — | — | 6:36 |
— | — | — | — | — | — | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 16 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 18 | 18 | 19 | 18 | 18 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 17 | 17 | 17 |
11 | 13 | 14 | 13 | 14 | 15 | 14 | 14 | 13 | 14 | 13 | 14 | 12 | 14 | 13 | 14 | 15 | 16 | 15 | 14 | 15 | 15 | 16 | 18 | |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | ESE 9 | SE 9 | SSE 7 | SE 9 | SE 9 | SE 9 | SE 11 | SE 11 | ESE 11 | SSE 7 | SE 8 | SSE 8 | SSE 9 | SSE 9 | SSE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 11 |
 kJ | 17 | 16 | 15 | 9 | 13 | 50 | 3 | 3 | 3 | 4 | 18 | 11 | 5 | 31 | 47 | 86 | 68 | 50 | 67 | 50 | 39 | 41 | 42 | 56 |
Swell 2 Height (m) Direction Period (s) | S 3 | S 3 | S 6 | W 6 | SE 11 | SE 8 | SE 11 | SE 11 | SE 11 | SE 8 | — | — | ESE 10 | SE 10 | — | — | — | — | — | — | — | — | — | — |
| kJ | 1 | 1 | 1 | 1 | 5 | 3 | 5 | 5 | 5 | 3 | — | — | 11 | 51 | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 6 | S 6 | — | — | W 6 | SE 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 1 | — | — | 1 | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | SE 2 | SSE 6 | SSE 6 | SE 7 | SSE 6 | SSE 6 | S 6 | S 5 | S 5 | S 4 | S 4 | S 4 | S 3 | — | — | — | S 2 | S 3 | SSE 3 | — | — | — |
| kJ | — | — | 2 | 22 | 51 | 100 | 47 | 56 | 39 | 29 | 26 | 20 | 21 | 11 | 6 | — | — | — | 1 | 1 | 2 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 38 | 145 | 64 | 470 | 491 | 77 | 77 | 77 | 76 | 77 | 77 | 77 | 77 | 77 | 38 | 14 | 14 | 18 | 64 | 64 | 64 | 38 | 38 | 0 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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