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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 pm Monday 25 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
20.2° 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 8PM is: 0.6m 7s primary swell from a South-southeast direction and 0.2m 8s secondary swell from a South-southwest direction (forecast issued at 02:00pm May 25). The wind direction is predicted to be cross-shore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (25 May) | - | - |
| Afternoon (25 May) | 2ft (0.6m) | 7s |
| Evening (25 May) | 2ft (0.6m) | 7s |
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 24°C on Tue afternoon, min 19°C on Mon night). Winds increasing (calm on Tue morning, fresh winds from the SSW by Thu morning). | ||||||||||||||||||||||||
Mon 25 | Tuesday 26 | Wednesday 27 | Thu 28 | |||||||||||||||||||||
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 7 | SSE 7 | SE 7 | SSE 7 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 6 | SE 7 | SE 7 | S 4 | SSW 4 | SSW 4 | |
43 | 37 | 27 | 37 | 28 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 20 | 9 | 8 | 8 | 8 | 8 | 9 | 13 | 8 | 12 | 14 | 20 | |
Wind (km/h) | ||||||||||||||||||||||||
glassy | cross-on | cross-on | cross | glassy | cross-off | cross-off | off | glassy | cross-on | cross-on | cross | glassy | off | off | cross-off | glassy | on | cross-on | on | on | on | on | on | |
High Tide | 10:52AM1.06m | 00:37AM1.24m | 12:39PM1.06m | 1:15AM1.26m | 2:09PM1.12m | 1:51AM1.29m | ||||||||||||||||||
Low Tide | 5:34PM0.48m | 7:00AM0.68m | 6:41PM0.59m | 7:54AM0.52m | 7:44PM0.68m | 8:41AM0.36m | ||||||||||||||||||
 |  | |  | | | | | | | |  |  | |  | | | | | | | | | | |
 | — | — | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:30 | — | — | — | — | — | — | — | 4:30 | — | — |
 | — | — | 6:45 | — | — | — | — | — | — | — | 6:45 | — | — | — | — | — | — | — | 6:46 | — | — | — | — | 6:47 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 22 | 23 | 22 | 20 | 20 | 19 | 19 | 21 | 23 | 24 | 23 | 21 | 21 | 21 | 21 | 22 | 23 | 24 | 23 | 22 | 22 | 22 | 21 | 21 |
22 | 23 | 22 | 21 | 22 | 20 | 20 | 22 | 24 | 24 | 23 | 22 | 23 | 22 | 21 | 22 | 25 | 26 | 24 | 23 | 22 | 22 | 20 | 18 | |
Swell 1 Height (m) Direction Period (s) | SE 7 | SSE 7 | SE 7 | SSE 7 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 6 | SE 7 | SE 7 | ESE 7 | ESE 7 | ESE 10 |
 kJ | 43 | 37 | 27 | 37 | 28 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 20 | 9 | 8 | 8 | 8 | 8 | 9 | 13 | 8 | 5 | 5 | 9 |
Swell 2 Height (m) Direction Period (s) | S 9 | SSW 9 | SSW 8 | SSW 8 | SSE 7 | S 7 | S 7 | SSE 7 | S 7 | S 6 | S 6 | S 6 | S 6 | S 6 | S 6 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | E 13 |
| kJ | 2 | 8 | 7 | 6 | 9 | 8 | 8 | 4 | 4 | 3 | 3 | 3 | 1 | 1 | 1 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 |
Swell 3 Height (m) Direction Period (s) | E 12 | E 13 | E 16 | E 16 | SSW 7 | — | E 15 | S 7 | E 15 | S 10 | S 11 | S 11 | SE 11 | SE 11 | SE 11 | S 6 | SE 10 | S 6 | SE 10 | E 14 | E 14 | E 13 | E 13 | SE 10 |
| kJ | 3 | 3 | 5 | 5 | 5 | — | 4 | 4 | 4 | 2 | 2 | 2 | 5 | 4 | 4 | 1 | 4 | 1 | 4 | 4 | 4 | 4 | 3 | 4 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 2 | S 4 | SSW 4 | SSW 4 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 12 | 14 | 20 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 16 | 16 | 38 | 38 | 38 | 38 | 51 | 16 | 16 | 16 | 38 | 38 | 16 | 51 | 16 | 16 | 16 | 16 | 38 | 64 | 77 | 38 | 38 | 92 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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