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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 pm Wednesday 29 Apr 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
20.0° C
(Which is slightly warmer than usual)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 5PM is: 0.6m 6s primary swell from a South direction (forecast issued at 02:00pm April 29). An open ocean swell of 0.5m 3s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (29 Apr) | - | - |
| Afternoon (29 Apr) | 2ft (0.6m) | 6s |
| Evening (29 Apr) | 1.5ft (0.5m) | 6s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 43mm), heaviest during Fri morning. Very mild (max 19°C on Wed afternoon, min 11°C on Thu night). Mainly strong winds. | ||||||||||||||||||||||||
Wed 29 | Thursday 30 | Friday 1 | Sat 2 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
S 6 | S 6 | SSW 6 | S 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | ESE 7 | SE 7 | ESE 6 | SE 6 | SE 5 | SSE 6 | SSE 7 | SSE 8 | SSE 8 | SSE 9 | SSW 8 | SSW 8 | SW 8 | SW 9 | SSW 10 | SSW 10 | |
38 | 28 | 29 | 19 | 12 | 6 | 3 | 3 | 5 | 8 | 27 | 9 | 7 | 24 | 75 | 197 | 284 | 477 | 721 | 737 | 1432 | 1176 | 318 | 227 | |
Wind (km/h) | ||||||||||||||||||||||||
off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | off | off | cross-off | cross-off | on | on | cross-on | cross | cross-off | cross-off | cross-on | |
High Tide | 3:25PM1.22m | 3:26AM1.28m | 4:17PM1.30m | 3:52AM1.32m | 5:05PM1.35m | 4:18AM1.35m | ||||||||||||||||||
Low Tide | 9:15AM0.46m | 9:24PM0.50m | 9:51AM0.30m | 10:05PM0.56m | 10:27AM0.16m | 10:43PM0.63m | ||||||||||||||||||
 |  | |  | |  | | |  | | | | |  |  | | | | |  |  | |  | | |
 | — | — | — | — | — | 4:52 | — | — | — | — | — | — | — | 4:50 | — | — | — | — | — | — | — | 4:50 | — | — |
 | — | — | 6:24 | — | — | — | — | — | — | — | 6:25 | — | — | — | — | — | — | — | 6:25 | — | — | — | — | 6:27 |
— | — | — | 2 | 1 | — | — | — | 1 | 1 | — | 1 | 2 | 8 | 12 | 13 | 2 | — | — | — | — | — | — | — | |
Temp °C | 19 | 19 | 17 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 14 | 13 | 12 | 11 | 11 | 13 | 15 | 16 | 17 | 17 | 16 | 15 | 15 | 17 |
17 | 16 | 13 | 9 | 8 | 9 | 9 | 10 | 10 | 9 | 12 | 10 | 7 | 5 | 4 | 6 | 13 | 16 | 16 | 8 | 13 | 14 | 14 | 15 | |
Swell 1 Height (m) Direction Period (s) | S 6 | S 6 | SSW 6 | S 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | ESE 7 | SE 7 | SE 6 | SE 6 | SE 5 | SSE 6 | SSE 7 | SSE 8 | SSE 8 | SSE 9 | S 9 | SE 9 | SSW 8 | SSW 8 | SSW 10 | SSW 10 |
 kJ | 38 | 28 | 29 | 19 | 12 | 6 | 3 | 3 | 5 | 8 | 10 | 9 | 7 | 24 | 75 | 197 | 284 | 477 | 548 | 118 | 634 | 422 | 318 | 227 |
Swell 2 Height (m) Direction Period (s) | E 11 | E 11 | — | — | — | SE 4 | ESE 4 | SE 5 | SE 5 | S 5 | S 5 | SE 9 | SE 9 | SE 10 | — | — | — | — | — | — | — | — | SE 10 | SE 11 |
| kJ | 2 | 2 | — | — | — | 1 | 2 | 1 | 1 | 1 | 1 | 3 | 3 | 4 | — | — | — | — | — | — | — | — | 4 | 4 |
Swell 3 Height (m) Direction Period (s) | — | SE 11 | SE 11 | S 13 | — | SE 8 | SE 8 | SE 8 | S 5 | SW 6 | SW 6 | S 5 | E 9 | — | — | — | — | — | — | — | — | — | SE 10 | SSE 7 |
| kJ | — | 5 | 5 | 3 | — | 3 | 3 | 3 | 1 | 1 | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | 4 | 11 |
Wind waves Height (m) Direction Period (s) | — | — | E 3 | E 3 | ENE 3 | ENE 3 | NE 3 | ENE 2 | — | — | ESE 6 | — | — | — | — | N 3 | N 3 | — | SSW 8 | SSW 8 | SW 8 | SW 9 | — | — |
| kJ | — | — | 4 | 5 | 3 | 3 | 2 | 1 | — | — | 27 | — | — | — | — | 4 | 2 | — | 721 | 737 | 1432 | 1176 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 38 | 64 | 895 | 1030 | 145 | 1030 | 1030 | 1030 | 51 | 38 | 488 | 755 | 755 | 565 | 470 | 54 | 2 | 0 | 14 | 487 | 18 | 14 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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