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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 pm Sunday 10 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
21.2° C
(Which is 1.2°C warmer than normal for this time of year)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 5PM is: 0.7m 6s primary swell from a South-southeast direction and 0.2m 9s secondary swell from a East-southeast direction, 0.1m 11s secondary swell from a Southeast direction (forecast issued at 02:00pm May 10). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (10 May) | - | - |
| Afternoon (10 May) | 1.5ft (0.5m) | 6s |
| Evening (10 May) | 2.5ft (0.7m) | 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 2mm), mostly falling on Sun night. Very mild (max 19°C on Sun afternoon, min 16°C on Tue night). Winds decreasing (fresh winds from the S on Mon afternoon, calm by Tue night). | ||||||||||||||||||||||||
Sun 10 | Monday 11 | Tuesday 12 | Wed 13 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
SE 10 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | S 6 | S 5 | S 4 | S 4 | SE 10 | SSE 9 | SSE 8 | SSE 8 | SE 9 | SE 9 | SE 10 | SE 10 | SE 9 | SE 9 | SE 11 | SE 9 | SE 9 | |
15 | 20 | 34 | 35 | 29 | 26 | 33 | 30 | 27 | 29 | 29 | 25 | 161 | 80 | 64 | 81 | 70 | 76 | 57 | 53 | 53 | 55 | 41 | 28 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | glassy | glassy | off | glassy | |
High Tide | 9:58AM1.08m | 00:56AM1.20m | 11:56AM1.05m | 1:36AM1.22m | 1:36PM1.09m | 2:10AM1.25m | ||||||||||||||||||
Low Tide | 5:26PM0.37m | 6:54AM0.81m | 6:38PM0.46m | 7:52AM0.65m | 7:43PM0.53m | 8:37AM0.48m | ||||||||||||||||||
 | | |  | |  |  |  | | | | | | | | | | | | | | | | | |
 | — | — | — | — | — | 4:41 | — | — | — | — | — | — | — | 4:39 | — | — | — | — | — | — | — | 4:39 | — | — |
 | — | — | 6:34 | — | — | — | — | — | — | — | 6:35 | — | — | — | — | — | — | — | 6:35 | — | — | — | — | 6:36 |
— | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 19 | 19 | 19 | 18 | 18 | 18 | 17 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 18 | 19 | 18 | 18 | 17 | 17 | 16 | 18 |
16 | 14 | 15 | 14 | 14 | 15 | 14 | 14 | 13 | 12 | 13 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 17 | 17 | 18 | 16 | 18 | |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 9 | ESE 9 | SE 9 | SE 9 | SE 11 | SE 8 | SE 11 | SE 11 | ESE 11 | ESE 11 | ESE 10 | SSE 9 | SSE 8 | SSE 8 | SE 9 | SE 9 | SE 10 | SE 10 | SE 9 | SE 9 | SE 11 | SE 9 | SE 9 |
 kJ | 15 | 14 | 8 | 3 | 3 | 5 | 3 | 4 | 18 | 11 | 11 | 11 | 161 | 80 | 64 | 81 | 70 | 76 | 57 | 53 | 53 | 55 | 41 | 28 |
Swell 2 Height (m) Direction Period (s) | S 6 | S 6 | SE 11 | SE 11 | SE 11 | SE 8 | SE 11 | SE 8 | — | — | — | SE 10 | ESE 8 | — | — | — | — | — | — | — | — | — | S 9 | SE 11 |
| kJ | 1 | 1 | 5 | 5 | 5 | 3 | 5 | 3 | — | — | — | 25 | 28 | — | — | — | — | — | — | — | — | — | 2 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | W 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | S 6 | S 5 | S 4 | S 4 | S 4 | SSE 8 | — | — | — | — | S 3 | S 3 | — | — | — | — | — |
| kJ | — | 20 | 34 | 35 | 29 | 26 | 33 | 30 | 27 | 29 | 29 | 18 | 70 | — | — | — | — | 1 | 1 | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 38 | 145 | 64 | 470 | 491 | 77 | 77 | 77 | 76 | 77 | 77 | 77 | 77 | 77 | 38 | 14 | 14 | 18 | 64 | 64 | 64 | 38 | 38 | 0 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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