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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 am Monday 11 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 6AM is: 0.6m 6s primary swell from a South-southeast direction and 0.1m 8s secondary swell from a Southeast direction (forecast issued at 02:00am May 11). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 May) | 2ft (0.6m) | 6s |
| Afternoon (11 May) | 2.5ft (0.8m) | 4s |
| Evening (11 May) | 1.5ft (0.5m) | 10s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Warm (max 20°C on Wed afternoon, min 17°C on Mon night). Winds decreasing (fresh winds from the S on Mon afternoon, calm by Tue night). | ||||||||||||||||||||||||
Monday 11 | Tuesday 12 | Wednesday 13 | ||||||||||||||||||||||
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 |    |    |    | |||||||||||||||||||||
SSE 6 | SSE 6 | SSE 6 | S 6 | S 5 | S 4 | S 4 | SE 10 | SSE 8 | SSE 9 | SSE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 | |
29 | 45 | 25 | 23 | 36 | 22 | 22 | 48 | 123 | 65 | 67 | 81 | 86 | 68 | 65 | 67 | 52 | 51 | 40 | 40 | 29 | 29 | 30 | 33 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | on | on | on | on | on | on | cross-on | on | on | on | on | cross-on | on | glassy | off | glassy | glassy | on | on | on | |
High Tide | 00:56AM1.20m | 11:56AM1.05m | 1:36AM1.22m | 1:36PM1.09m | 2:10AM1.25m | 2:50PM1.17m | ||||||||||||||||||
Low Tide | 6:54AM0.81m | 6:38PM0.46m | 7:52AM0.65m | 7:43PM0.53m | 8:37AM0.48m | 8:38PM0.60m | ||||||||||||||||||
 | |  |  | | | |  | | | | | | | | | | | |  | | | | | |
 | — | 4:41 | — | — | — | — | — | — | — | 4:39 | — | — | — | — | — | — | — | 4:39 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:35 | — | — | — | — | — | — | — | 6:35 | — | — | — | — | — | — | — | 6:36 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 19 | 18 | 18 | 18 | 19 | 19 | 18 | 18 | 18 | 17 | 17 | 18 | 18 | 19 | 18 | 18 | 17 | 17 | 17 | 18 | 19 | 20 | 19 | 18 |
16 | 16 | 16 | 15 | 15 | 14 | 13 | 14 | 15 | 15 | 16 | 17 | 16 | 16 | 15 | 17 | 16 | 18 | 17 | 18 | 18 | 18 | 17 | 16 | |
Swell 1 Height (m) Direction Period (s) | SE 9 | SSE 6 | SSE 6 | SE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 10 | SSE 8 | SSE 9 | SSE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 |
 kJ | 3 | 27 | 25 | 5 | 11 | 11 | 11 | 11 | 123 | 65 | 67 | 81 | 86 | 68 | 65 | 67 | 52 | 51 | 40 | 40 | 29 | 29 | 30 | 33 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 9 | SE 8 | SE 8 | — | — | — | SE 10 | ESE 10 | — | — | — | — | — | — | — | — | — | S 9 | — | SE 11 | SE 11 | — | SE 11 |
| kJ | 5 | 3 | 3 | 3 | — | — | — | 48 | 18 | — | — | — | — | — | — | — | — | — | 2 | — | 5 | 5 | — | 5 |
Swell 3 Height (m) Direction Period (s) | — | SE 11 | SE 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 5 | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSE 6 | SSE 6 | — | S 6 | S 5 | S 4 | S 4 | S 4 | SSE 8 | — | — | — | — | S 3 | S 3 | — | — | — | — | — | — | — | S 3 | — |
| kJ | 29 | 45 | — | 23 | 36 | 22 | 22 | 18 | 70 | — | — | — | — | 2 | 2 | — | — | — | — | — | — | — | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 38 | 14 | 38 | 77 | 77 | 77 | 77 | 76 | 14 | 38 | 17 | 16 | 54 | 54 | 51 | 38 | 38 | 0 | 38 | 16 | 16 | 18 | 18 | 38 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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