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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 am Sunday 03 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 12PM is: 0.5m 7s primary swell from a South direction and 0.2m 10s secondary swell from a East-southeast direction (forecast issued at 08:00am May 03). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (03 May) | 1ft (0.3m) | 6s |
| Afternoon (03 May) | 3.5ft (1.1m) | 4s |
| Evening (03 May) | 5.5ft (1.7m) | 6s |
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 5mm), mostly falling on Sun night. Warm (max 22°C on Mon morning, min 15°C on Mon night). Winds decreasing (near gales from the SSW on Sun night, calm by Tue morning). | ||||||||||||||||||||||||
Sunday 3 | Monday 4 | Tuesday 5 | Wed 6 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
SSW 7 | SSW 6 | S 7 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | S 7 | SSW 8 | SSW 9 | SSW 8 | SSW 7 | SSW 7 | SW 8 | SSW 8 | SW 9 | SW 9 | SSW 9 | SW 9 | SE 10 | SE 10 | S 4 | S 5 | S 6 | |
9 | 8 | 23 | 46 | 107 | 179 | 291 | 724 | 1408 | 1230 | 804 | 561 | 515 | 948 | 207 | 84 | 39 | 42 | 12 | 25 | 25 | 6 | 20 | 23 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | on | on | on | on | on | on | on | on | on | on | cross-on | cross-off | off | off | off | glassy | on | on | cross-on | on | on | on | |
High Tide | 4:45AM1.38m | 6:36PM1.38m | 5:12AM1.40m | 7:22PM1.35m | 5:42AM1.40m | 8:10PM1.31m | ||||||||||||||||||
Low Tide | 11:39AM-0.03m | 11:51PM0.79m | 12:16PM-0.07m | 00:25AM0.86m | 12:56PM-0.07m | 1:01AM0.92m | ||||||||||||||||||
 |  | | | |  |  |  |  |  | | | | | | | | | | | | | | | |
 | 4:48 | — | — | — | — | — | — | 4:48 | — | — | — | — | — | — | — | 4:47 | — | — | — | — | — | — | — | 4:46 |
 | — | — | — | — | 6:28 | — | — | — | — | — | — | — | 6:29 | — | — | — | — | — | — | — | 6:30 | — | — | 6:30 |
— | — | — | — | — | — | — | 3 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 17 | 19 | 20 | 21 | 19 | 19 | 19 | 20 | 21 | 21 | 22 | 21 | 19 | 19 | 15 | 15 | 15 | 16 | 16 | 17 | 17 | 18 | 17 | 17 |
14 | 18 | 16 | 14 | 12 | 12 | 12 | 12 | 14 | 13 | 12 | 10 | 8 | 17 | 7 | 9 | 11 | 13 | 10 | 11 | 11 | 13 | 13 | 14 | |
Swell 1 Height (m) Direction Period (s) | SSW 7 | SSW 6 | ESE 10 | ESE 10 | SE 10 | ESE 9 | ESE 9 | SE 9 | ESE 9 | ESE 10 | ESE 10 | ESE 10 | E 11 | SSW 8 | SSW 8 | SW 9 | SW 9 | SSW 9 | S 7 | SSW 8 | SW 8 | SSE 7 | SE 10 | SE 10 |
 kJ | 9 | 8 | 10 | 9 | 4 | 35 | 35 | 22 | 17 | 20 | 20 | 21 | 2 | 295 | 207 | 84 | 39 | 42 | 8 | 6 | 3 | 4 | 4 | 4 |
Swell 2 Height (m) Direction Period (s) | SSE 7 | SE 10 | — | — | — | — | — | — | — | — | — | — | — | WSW 7 | SE 11 | S 8 | S 7 | SE 10 | SW 9 | SE 10 | SE 10 | SE 10 | SW 8 | SW 7 |
| kJ | 5 | 4 | — | — | — | — | — | — | — | — | — | — | — | 76 | 5 | 41 | 26 | 4 | 12 | 4 | 4 | 4 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 11 | SE 11 | — | SE 10 | SE 10 | SE 10 | SW 7 | SE 11 | WSW 7 |
| kJ | 4 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 5 | — | 4 | 25 | 25 | 2 | 5 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | S 7 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | S 7 | SSW 8 | SSW 9 | SSW 8 | SSW 7 | SSW 7 | SW 8 | — | — | NE 3 | ENE 3 | — | S 7 | S 3 | S 4 | S 5 | S 6 |
| kJ | — | — | 23 | 46 | 107 | 179 | 291 | 724 | 1408 | 1230 | 804 | 561 | 515 | 948 | — | — | 2 | 1 | — | 22 | 8 | 6 | 20 | 23 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 16 | 16 | 841 | 2037 | 2050 | 755 | 755 | 488 | 470 | 470 | 470 | 509 | 509 | 0 | 27 | 0 | 0 | 38 | 228 | 77 | 77 | 77 | 76 | 76 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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