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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 am Thursday 14 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
19.1° C
(Which is 1.1°C colder than average for this time of year)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 5AM is: 0.4m 10s primary swell from a Southeast direction and 0.1m 10s secondary swell from a Southeast direction (forecast issued at 02:00am May 14). The wind direction is predicted to be glassy.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (14 May) | 1ft (0.3m) | 10s |
| Afternoon (14 May) | 0.5ft (0.2m) | 10s |
| Evening (14 May) | 1ft (0.3m) | 10s |
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 Thu afternoon. Warm (max 22°C on Thu morning, min 14°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||||
Thursday 14 | Friday 15 | Saturday 16 | ||||||||||||||||||||||
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 |    |    |    | |||||||||||||||||||||
SE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SE 10 | ESE 11 | SE 11 | SE 8 | SE 9 | SE 12 | SE 8 | ESE 8 | ESE 8 | SE 8 | SE 8 | SE 7 | SE 7 | ESE 9 | SE 7 | SE 7 | SE 7 | |
47 | 24 | 24 | 19 | 9 | 9 | 10 | 16 | 11 | 18 | 10 | 12 | 5 | 11 | 7 | 6 | 15 | 9 | 9 | 8 | 17 | 17 | 26 | 27 | |
Wind (km/h) | ||||||||||||||||||||||||
off | glassy | glassy | cross-off | cross-off | cross-on | cross | cross-off | off | off | off | off | off | cross-off | cross | cross-off | off | off | off | off | glassy | on | cross-on | glassy | |
High Tide | 2:40AM1.28m | 3:50PM1.25m | 3:10AM1.32m | 4:42PM1.32m | 3:39AM1.36m | 5:29PM1.36m | ||||||||||||||||||
Low Tide | 9:17AM0.32m | 9:25PM0.66m | 9:56AM0.17m | 10:08PM0.73m | 10:34AM0.05m | |||||||||||||||||||
 |  |  | | | |  |  |  | |  | | | | | | | | | | | |  | | |
 | — | 4:39 | — | — | — | — | — | — | — | 4:37 | — | — | — | — | — | — | — | 4:37 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:37 | — | — | — | — | — | — | — | 6:37 | — | — | — | — | — | — | — | 6:38 | — |
— | — | — | — | — | — | 4 | 4 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 19 | 18 | 18 | 20 | 22 | 21 | 20 | 16 | 15 | 15 | 14 | 15 | 18 | 21 | 19 | 17 | 17 | 16 | 16 | 18 | 21 | 21 | 21 | 20 |
18 | 18 | 18 | 19 | 21 | 19 | 20 | 12 | 11 | 12 | 10 | 11 | 15 | 18 | 16 | 16 | 17 | 15 | 14 | 16 | 20 | 19 | 20 | 21 | |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | ESE 10 | SSE 8 | SSE 7 | SSE 6 | SE 10 | ESE 11 | SE 11 | SE 8 | SE 9 | SE 10 | SE 8 | ESE 8 | ESE 8 | SE 8 | SE 8 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 |
 kJ | 47 | 24 | 24 | 19 | 6 | 5 | 4 | 16 | 11 | 18 | 10 | 12 | 4 | 11 | 7 | 6 | 15 | 9 | 9 | 8 | 7 | 13 | 26 | 27 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 10 | SE 10 | SSE 8 | ESE 10 | ESE 10 | ESE 10 | E 9 | ESE 4 | SSE 6 | SE 11 | SE 11 | SE 6 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 10 | SSE 10 | SE 10 |
| kJ | 5 | 4 | 4 | 6 | 9 | 9 | 10 | 2 | 1 | 4 | 5 | 5 | 2 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 9 | 14 |
Swell 3 Height (m) Direction Period (s) | S 9 | — | S 7 | SE 10 | SE 10 | SE 10 | E 9 | S 7 | SSE 6 | S 7 | SE 12 | SE 12 | SE 12 | S 7 | S 7 | S 7 | — | — | — | — | ESE 9 | ESE 9 | E 9 | E 10 |
| kJ | 2 | — | 1 | 4 | 4 | 4 | 2 | 1 | 4 | 1 | 6 | 6 | 5 | 1 | 1 | 1 | — | — | — | — | 17 | 17 | 6 | 2 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | SSE 3 | ESE 2 | NE 3 | NE 3 | NE 3 | NE 3 | NE 3 | ENE 2 | ESE 2 | ESE 4 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 1 | 1 | 2 | 3 | 3 | 3 | 2 | 1 | 1 | 2 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 18 | 16 | 38 | 38 | 38 | 16 | 16 | 64 | 38 | 38 | 145 | 145 | 145 | 487 | 2812 | 38 | 64 | 38 | 16 | 38 | 38 | 16 | 16 | 18 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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