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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 pm Friday 15 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
19.6° C
(Which is slightly cooler than normal)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 5AM is: 0.3m 8s primary swell from a Southeast direction and 0.1m 11s secondary swell from a Southeast direction (forecast issued at 08:00pm May 15). The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 May) | 1ft (0.3m) | 7s |
| Afternoon (16 May) | 1ft (0.3m) | 7s |
| Evening (16 May) | 1ft (0.3m) | 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 22°C on Sun morning, min 16°C on Fri night). Winds increasing (calm on Fri night, fresh winds from the S by Mon afternoon). | ||||||||||||||||||||||||
Fri 15 | Saturday 16 | Sunday 17 | Monday 18 | |||||||||||||||||||||
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 | 12 PM | 3 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
E 10 | SE 8 | SE 8 | SE 8 | SE 8 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 11 | SE 8 | SE 8 | SE 10 | SE 10 | SE 8 | SE 8 | SE 9 | ESE 9 | SE 8 | SE 8 | |
48 | 10 | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 12 | 7 | 7 | 19 | 10 | 10 | 15 | 23 | 11 | 11 | 12 | 8 | 10 | 16 | |
Wind (km/h) | ||||||||||||||||||||||||
on | glassy | glassy | cross-off | cross-off | cross-off | glassy | on | on | on | on | on | glassy | glassy | cross-on | on | on | on | glassy | glassy | glassy | cross-on | on | on | |
High Tide | 4:42PM1.32m | 3:39AM1.36m | 5:29PM1.36m | 4:08AM1.40m | 6:15PM1.38m | 4:38AM1.42m | ||||||||||||||||||
Low Tide | 10:08PM0.73m | 10:34AM0.05m | 10:46PM0.79m | 11:11AM-0.04m | 11:23PM0.86m | 11:49AM-0.09m | ||||||||||||||||||
 |  | | | | | | |  |  | |  | | | | | | | | | | | | | |
 | — | — | — | 4:37 | — | — | — | — | — | — | — | 4:35 | — | — | — | — | — | — | — | 4:35 | — | — | — | — |
 | 6:37 | — | — | — | — | — | — | — | 6:38 | — | — | — | — | — | — | — | 6:38 | — | — | — | — | — | — | 6:39 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 18 | 17 | 17 | 17 | 16 | 17 | 19 | 20 | 19 | 18 | 18 | 18 | 18 | 21 | 22 | 22 | 21 | 21 | 22 | 20 | 19 | 20 | 21 | 21 |
17 | 17 | 18 | 17 | 15 | 17 | 19 | 17 | 16 | 15 | 16 | 17 | 18 | 20 | 21 | 19 | 17 | 19 | 22 | 20 | 19 | 18 | 18 | 16 | |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 10 | SE 10 | SE 8 | SE 8 | SE 9 | ESE 9 | SE 8 | ESE 10 |
 kJ | 11 | 10 | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 12 | 7 | 7 | 8 | 10 | 10 | 15 | 23 | 11 | 11 | 12 | 8 | 10 | 10 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | — | — | S 3 | SE 10 | SE 8 | SSE 8 | SE 10 | SE 8 |
| kJ | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | — | — | 2 | 4 | 3 | 6 | 4 | 15 |
Swell 3 Height (m) Direction Period (s) | S 7 | S 7 | S 6 | S 6 | S 6 | S 6 | S 6 | S 6 | E 10 | SE 13 | SE 14 | SE 14 | — | SE 11 | — | — | — | — | SE 10 | — | SE 12 | SE 11 | SSE 10 | SE 10 |
| kJ | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 7 | 7 | 7 | — | 19 | — | — | — | — | 4 | — | 5 | 4 | 10 | 16 |
Wind waves Height (m) Direction Period (s) | E 10 | — | — | — | — | — | — | — | S 3 | S 3 | — | — | — | — | — | — | SSE 3 | S 3 | WSW 2 | — | — | — | S 2 | S 3 |
| kJ | 48 | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | 3 | 3 | 1 | — | — | — | 1 | 10 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 54 | 51 | 51 | 51 | 51 | 16 | 16 | 64 | 18 | 51 | 51 | 54 | 16 | 16 | 18 | 77 | 76 | 38 | 16 | 38 | 38 | 18 | 77 | 77 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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