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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 am Wednesday 27 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
20.5° C
(Which is slightly cooler than normal)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 11AM is: 0.4m 8s primary swell from a Southeast direction and 0.1m 10s secondary swell from a Southeast direction (forecast issued at 08:00am May 27). The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (27 May) | 1ft (0.3m) | 7s |
| Afternoon (27 May) | 1.5ft (0.4m) | 8s |
| Evening (27 May) | 1ft (0.3m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastSome drizzle, heaviest during Thu afternoon. Warm (max 25°C on Fri morning, min 20°C on Wed night). Winds decreasing (fresh winds from the SSW on Wed night, calm by Fri night). | ||||||||||||||||||||||||
Wednesday 27 | Thursday 28 | Friday 29 | Sat 30 | |||||||||||||||||||||
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 | 12 AM | 3 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | S 3 | SE 10 | SE 10 | ESE 10 | SSE 5 | SE 6 | SE 6 | S 6 | S 6 | SSW 7 | SW 6 | SSW 7 | SSW 7 | S 7 | S 7 | SSW 7 | S 7 | SW 7 | |
9 | 9 | 15 | 15 | 10 | 10 | 8 | 15 | 15 | 9 | 9 | 5 | 9 | 25 | 30 | 183 | 97 | 77 | 63 | 48 | 51 | 57 | 39 | 13 | |
Wind (km/h) | ||||||||||||||||||||||||
off | off | cross-off | on | on | on | on | on | on | glassy | cross-off | cross-off | glassy | cross-on | on | cross-on | cross-off | glassy | on | glassy | cross-off | cross-off | glassy | glassy | |
High Tide | 2:09PM1.12m | 1:51AM1.29m | 3:19PM1.20m | 2:25AM1.33m | 4:17PM1.27m | 2:58AM1.37m | ||||||||||||||||||
Low Tide | 7:54AM0.52m | 7:44PM0.68m | 8:41AM0.36m | 8:40PM0.75m | 9:23AM0.21m | 9:28PM0.82m | ||||||||||||||||||
 | | |  | |  | |  | | | |  | | |  | |  | | | | | | | | |
 | 4:30 | — | — | — | — | — | — | 4:30 | — | — | — | — | — | — | — | 4:28 | — | — | — | — | — | — | — | 4:28 |
 | — | — | — | — | 6:46 | — | — | — | — | — | — | — | 6:47 | — | — | — | — | — | — | — | 6:47 | — | — | 6:49 |
— | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 21 | 22 | 24 | 23 | 22 | 22 | 21 | 20 | 20 | 20 | 21 | 22 | 22 | 22 | 22 | 21 | 22 | 25 | 24 | 24 | 23 | 22 | 21 | 22 |
21 | 22 | 25 | 22 | 21 | 21 | 18 | 18 | 20 | 22 | 23 | 25 | 26 | 25 | 23 | 22 | 24 | 28 | 26 | 27 | 22 | 21 | 22 | 23 | |
Swell 1 Height (m) Direction Period (s) | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | ESE 8 | SE 10 | SE 10 | SSE 5 | S 5 | SE 6 | SE 6 | S 6 | S 6 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | S 7 | S 7 | SSW 7 | S 7 | SW 7 |
 kJ | 9 | 9 | 15 | 15 | 10 | 10 | 6 | 15 | 15 | 5 | 4 | 5 | 8 | 25 | 30 | 86 | 75 | 77 | 63 | 48 | 51 | 57 | 39 | 13 |
Swell 2 Height (m) Direction Period (s) | S 6 | SE 10 | SE 10 | SE 14 | SE 10 | SE 10 | SE 10 | E 13 | E 13 | ESE 10 | SE 5 | S 5 | SSW 6 | SE 10 | SSW 8 | SE 9 | SE 12 | ESE 12 | ESE 12 | ESE 12 | SE 12 | SE 12 | SE 12 | SE 6 |
| kJ | 1 | 4 | 4 | 7 | 4 | 4 | 4 | 4 | 3 | 9 | 4 | 4 | 7 | 4 | 23 | 3 | 6 | 14 | 14 | 14 | 6 | 6 | 6 | 10 |
Swell 3 Height (m) Direction Period (s) | SE 11 | S 6 | S 6 | S 10 | E 14 | E 14 | E 13 | SE 10 | S 5 | E 13 | ESE 9 | SSW 6 | ESE 10 | SW 10 | SE 10 | SE 8 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | S 14 | S 14 | SE 12 |
| kJ | 4 | 1 | 1 | 2 | 4 | 4 | 4 | 4 | 1 | 3 | 8 | 3 | 9 | 4 | 4 | 3 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | — | S 6 | S 2 | SSW 3 | S 3 | S 3 | S 3 | SE 5 | SSE 5 | — | — | — | — | SSW 7 | SW 6 | — | — | — | — | ENE 2 | NE 3 | — |
| kJ | — | — | — | 2 | 1 | 3 | 8 | 4 | 2 | 3 | 9 | — | — | — | — | 183 | 97 | — | — | — | — | 1 | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 51 | 16 | 16 | 18 | 76 | 76 | 145 | 76 | 64 | 38 | 38 | 16 | 38 | 18 | 38 | 12 | 0 | 0 | 14 | 0 | 90 | 0 | 16 | 16 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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