- Forecast
- Maps
- Live
- Weather State
- Spot Information
Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 pm Saturday 02 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
19.9° C
(Which is slightly warmer than usual)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 9PM is: 0.4m 9s primary swell from a Southwest direction and 0.4m 8s secondary swell from a South-southeast direction (forecast issued at 02:00pm May 02). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (02 May) | - | - |
| Afternoon (02 May) | 2.5ft (0.7m) | 10s |
| Evening (02 May) | 1.5ft (0.4m) | 9s |
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 8mm), mostly falling on Sun night. Warm (max 22°C on Mon afternoon, min 15°C on Mon night). Winds increasing (calm on Sun morning, gales from the SSW by Sun night). | ||||||||||||||||||||||||
Sat 2 | Sunday 3 | Monday 4 | Tue 5 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
SSW 10 | SSW 10 | SW 10 | SW 9 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | S 7 | SSW 4 | SSW 5 | SSW 5 | SSW 6 | S 7 | SSW 8 | SSW 9 | SSW 9 | SSW 7 | SSW 7 | S 8 | SW 9 | SSW 8 | SSW 8 | SSW 8 | |
138 | 88 | 28 | 21 | 27 | 22 | 9 | 9 | 14 | 27 | 83 | 126 | 275 | 800 | 1657 | 1259 | 885 | 527 | 581 | 270 | 460 | 122 | 80 | 54 | |
Wind (km/h) | ||||||||||||||||||||||||
on | cross | on | on | cross-off | cross-off | off | glassy | on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | off | off | off | glassy | |
High Tide | 5:51PM1.38m | 4:45AM1.38m | 6:36PM1.38m | 5:12AM1.40m | 7:22PM1.35m | 5:42AM1.40m | ||||||||||||||||||
Low Tide | 11:03AM0.04m | 11:18PM0.71m | 11:39AM-0.03m | 11:51PM0.79m | 12:16PM-0.07m | 00:25AM0.86m | ||||||||||||||||||
 | |  |  | | |  | | | | | |  |  |  | | | | | |  | | | | |
 | — | — | — | — | — | 4:48 | — | — | — | — | — | — | — | 4:48 | — | — | — | — | — | — | — | 4:47 | — | — |
 | — | — | 6:27 | — | — | — | — | — | — | — | 6:28 | — | — | — | — | — | — | — | 6:29 | — | — | — | — | 6:30 |
— | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 4 | — | — | — | — | — | — | — | — | — | |
Temp °C | 20 | 21 | 20 | 20 | 19 | 18 | 17 | 18 | 19 | 20 | 20 | 19 | 18 | 20 | 21 | 21 | 21 | 22 | 20 | 19 | 18 | 15 | 15 | 16 |
16 | 18 | 18 | 18 | 18 | 17 | 16 | 19 | 15 | 13 | 13 | 12 | 11 | 11 | 13 | 14 | 12 | 12 | 10 | 15 | 15 | 6 | 9 | 13 | |
Swell 1 Height (m) Direction Period (s) | SSW 10 | SSW 10 | S 8 | SSE 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | ESE 10 | ESE 10 | SE 10 | SE 10 | ESE 9 | SE 9 | ESE 10 | — | ESE 10 | ESE 10 | SE 11 | S 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 |
 kJ | 138 | 88 | 28 | 19 | 27 | 22 | 9 | 9 | 10 | 9 | 4 | 4 | 35 | 21 | 18 | — | 20 | 20 | 29 | 270 | 223 | 122 | 80 | 54 |
Swell 2 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SW 10 | SW 9 | SSE 7 | ESE 9 | SSE 7 | SE 10 | — | — | — | — | — | — | — | — | — | — | — | — | ESE 11 | SE 11 | SE 11 | SE 10 |
| kJ | 12 | 20 | 24 | 21 | 5 | 8 | 5 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | 11 | 4 | 5 | 4 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SSE 8 | S 11 | — | SE 9 | S 7 | SE 10 | SE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 4 | 6 | 3 | — | 3 | 4 | 4 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 3 | — | — | — | — | E 2 | — | — | S 7 | SSW 4 | SSW 5 | SSW 5 | SSW 6 | S 7 | SSW 8 | SSW 9 | SSW 9 | SSW 7 | SSW 7 | SW 7 | SW 9 | NE 2 | NE 3 | NNE 3 |
| kJ | 3 | — | — | — | — | 1 | — | — | 14 | 27 | 83 | 126 | 275 | 800 | 1657 | 1259 | 885 | 527 | 581 | 144 | 460 | 1 | 5 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 534 | 12 | 16 | 18 | 38 | 38 | 16 | 16 | 572 | 944 | 1434 | 755 | 491 | 491 | 488 | 488 | 470 | 470 | 487 | 14 | 0 | 17 | 0 | 0 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
- Map Icons:
Break
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 Rock Island 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.
Nearest