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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 am 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
19.8° C
(Which is slightly warmer than usual)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 10AM is: 1.0m 11s primary swell from a South-southwest direction and 0.4m 8s secondary swell from a Southeast direction (forecast issued at 02:00am May 02). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (02 May) | 3.5ft (1.0m) | 11s |
| Afternoon (02 May) | 1.5ft (0.5m) | 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 ForecastModerate rain (total 10mm), heaviest on Mon morning. Warm (max 22°C on Mon morning, min 15°C on Mon night). Winds increasing (calm on Sun morning, near gales from the SSW by Sun night). | ||||||||||||||||||||||||
Saturday 2 | Sunday 3 | Monday 4 | ||||||||||||||||||||||
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 | 12 PM | 3 PM | 6 PM | 9 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
SSW 8 | SSW 8 | SSW 10 | SSW 11 | SSW 10 | SW 10 | SW 10 | SSW 9 | SSW 8 | SSW 7 | SSW 7 | S 6 | S 7 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | S 7 | SSW 8 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | S 8 | |
675 | 434 | 435 | 238 | 138 | 49 | 29 | 32 | 26 | 21 | 9 | 7 | 23 | 40 | 74 | 131 | 255 | 537 | 1019 | 1640 | 1176 | 722 | 619 | 317 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | off | on | cross-on | cross | cross-on | on | cross-on | cross-off | cross-off | glassy | on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | |
High Tide | 4:18AM1.35m | 5:51PM1.38m | 4:45AM1.38m | 6:36PM1.38m | 5:12AM1.40m | 7:22PM1.35m | ||||||||||||||||||
Low Tide | 10:43PM0.63m | 11:03AM0.04m | 11:18PM0.71m | 11:39AM-0.03m | 11:51PM0.79m | 12:16PM-0.07m | ||||||||||||||||||
 |  |  | | | |  |  | | | | | | | | | |  |  |  | | | | | |
 | — | 4:50 | — | — | — | — | — | — | — | 4:48 | — | — | — | — | — | — | — | 4:48 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:27 | — | — | — | — | — | — | — | 6:28 | — | — | — | — | — | — | — | 6:29 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 6 | — | — | — | — | |
Temp °C | 16 | 15 | 15 | 17 | 19 | 20 | 20 | 19 | 19 | 18 | 17 | 18 | 20 | 21 | 20 | 19 | 19 | 19 | 21 | 21 | 22 | 22 | 20 | 19 |
9 | 8 | 13 | 13 | 15 | 18 | 19 | 17 | 18 | 17 | 16 | 18 | 16 | 14 | 14 | 12 | 12 | 10 | 12 | 13 | 15 | 13 | 10 | 15 | |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 8 | SSW 10 | SSW 11 | SSW 10 | SW 10 | S 8 | SSW 9 | SSW 8 | SSW 7 | SSW 7 | S 6 | ESE 10 | ESE 10 | SE 10 | SE 10 | ESE 9 | ESE 10 | ESE 9 | — | ESE 11 | ESE 10 | ESE 11 | S 8 |
 kJ | 129 | 71 | 435 | 238 | 138 | 49 | 29 | 32 | 26 | 21 | 9 | 7 | 10 | 9 | 4 | 4 | 35 | 35 | 17 | — | 22 | 20 | 22 | 317 |
Swell 2 Height (m) Direction Period (s) | — | — | SE 11 | SE 8 | SE 8 | S 8 | SW 10 | SSE 8 | SSE 8 | ESE 9 | SSE 7 | SSW 7 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 5 | 16 | 16 | 31 | 24 | 12 | 6 | 8 | 5 | 5 | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | SE 11 | E 9 | SSE 8 | SE 9 | — | SE 9 | S 7 | SE 10 | SE 10 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 4 | 14 | 6 | 12 | — | 3 | 4 | 4 | 4 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 8 | SSW 8 | — | — | — | — | — | — | — | — | — | — | S 7 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | S 7 | SSW 8 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SW 7 |
| kJ | 675 | 434 | — | — | — | — | — | — | — | — | — | — | 23 | 40 | 74 | 131 | 255 | 537 | 1019 | 1640 | 1176 | 722 | 619 | 144 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 487 | 470 | 0 | 55 | 534 | 12 | 16 | 18 | 38 | 38 | 16 | 16 | 572 | 944 | 944 | 794 | 755 | 491 | 470 | 470 | 488 | 470 | 487 | 38 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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