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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 pm Friday 01 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 9PM is: 2.5m 8s primary swell from a South-southwest direction (forecast issued at 02:00pm May 01). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (01 May) | - | - |
| Afternoon (01 May) | 7.5ft (2.3m) | 9s |
| Evening (01 May) | 8ft (2.5m) | 8s |
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 16mm), heaviest on Fri afternoon. Warm (max 21°C on Sun afternoon, min 14°C on Fri night). Winds increasing (calm on Sun morning, gales from the SSW by Sun night). | ||||||||||||||||||||||||
Fri 1 | Saturday 2 | Sunday 3 | Mon 4 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
SSE 8 | S 9 | S 9 | SSW 8 | SSW 8 | SSW 8 | SSW 10 | SSW 11 | SSW 10 | SSW 10 | SW 10 | SSW 9 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 6 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | SSW 7 | SSW 8 | SSW 9 | |
1074 | 809 | 929 | 891 | 687 | 513 | 426 | 256 | 138 | 86 | 46 | 55 | 39 | 22 | 15 | 9 | 14 | 30 | 74 | 131 | 255 | 488 | 1180 | 1582 | |
Wind (km/h) | ||||||||||||||||||||||||
off | on | on | cross-on | cross-on | cross-on | glassy | on | cross-on | cross | glassy | cross | cross-off | off | glassy | glassy | on | on | on | on | on | on | on | on | |
High Tide | 5:05PM1.35m | 4:18AM1.35m | 5:51PM1.38m | 4:45AM1.38m | 6:36PM1.38m | 5:12AM1.40m | ||||||||||||||||||
Low Tide | 10:27AM0.16m | 10:43PM0.63m | 11:03AM0.04m | 11:18PM0.71m | 11:39AM-0.03m | 11:51PM0.79m | ||||||||||||||||||
 |  |  |  | | | | | | |  |  |  | | | | | |  | | |  | |  | |
 | — | — | — | — | — | 4:50 | — | — | — | — | — | — | — | 4:48 | — | — | — | — | — | — | — | 4:48 | — | — |
 | — | — | 6:25 | — | — | — | — | — | — | — | 6:27 | — | — | — | — | — | — | — | 6:28 | — | — | — | — | 6:29 |
18 | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 4 | 1 | |
Temp °C | 13 | 16 | 19 | 17 | 15 | 14 | 15 | 17 | 19 | 20 | 20 | 20 | 20 | 18 | 17 | 18 | 19 | 21 | 20 | 19 | 19 | 20 | 21 | 21 |
12 | 16 | 11 | 6 | 5 | 7 | 14 | 13 | 16 | 18 | 19 | 18 | 18 | 16 | 17 | 19 | 15 | 14 | 14 | 13 | 12 | 12 | 12 | 14 | |
Swell 1 Height (m) Direction Period (s) | SSE 8 | S 9 | SE 9 | — | SE 9 | SE 9 | SSW 10 | SSW 11 | SSW 10 | SSW 10 | SSE 8 | SSW 9 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | ESE 10 | ESE 10 | SE 10 | ESE 10 | ESE 9 | SE 9 | ESE 10 | ESE 10 |
 kJ | 370 | 809 | 491 | — | 129 | 59 | 426 | 256 | 138 | 86 | 20 | 55 | 39 | 22 | 15 | 9 | 9 | 9 | 4 | 35 | 35 | 22 | 18 | 19 |
Swell 2 Height (m) Direction Period (s) | — | SW 10 | — | — | — | — | SE 11 | SE 11 | SE 8 | SE 8 | SW 10 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 10 | SE 7 | — | — | — | — | — | — | — |
| kJ | — | 110 | — | — | — | — | 5 | 4 | 9 | 15 | 46 | 6 | 6 | 9 | 3 | 4 | 2 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SE 11 | SSE 7 | SSE 7 | S 11 | SE 9 | — | S 7 | SE 8 | E 4 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 4 | 11 | 11 | 2 | 3 | — | 1 | 2 | 1 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSE 8 | SSW 9 | S 9 | SSW 8 | SSW 8 | SSW 8 | — | — | — | — | — | — | — | — | — | — | SSW 6 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | SSW 7 | SSW 8 | SSW 9 |
| kJ | 1074 | 562 | 929 | 891 | 687 | 513 | — | — | — | — | — | — | — | — | — | — | 14 | 30 | 74 | 131 | 255 | 488 | 1180 | 1582 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 14 | 487 | 487 | 487 | 470 | 0 | 55 | 64 | 12 | 0 | 10 | 16 | 38 | 16 | 16 | 77 | 944 | 944 | 843 | 755 | 491 | 470 | 470 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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