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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 pm Friday 22 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
20.8° C
(Which is normal for this time of year)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 10PM is: 0.4m 7s primary swell from a South-southwest direction and 0.1m 11s secondary swell from a East direction (forecast issued at 02:00pm May 22). An open ocean swell of 0.8m 4s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (22 May) | - | - |
| Afternoon (22 May) | 1.5ft (0.5m) | 7s |
| Evening (22 May) | 1.5ft (0.4m) | 7s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 2mm), mostly falling on Fri afternoon. Warm (max 22°C on Mon morning, min 13°C on Fri night). Winds decreasing (strong winds from the NNE on Fri afternoon, calm by Mon morning). | ||||||||||||||||||||||||
Fri 22 | Saturday 23 | Sunday 24 | Mon 25 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
S 7 | S 7 | S 7 | SSW 7 | SSW 7 | S 7 | SSE 8 | S 7 | S 7 | S 7 | S 7 | S 7 | SE 7 | SE 6 | SE 6 | SE 6 | SE 6 | SE 7 | SSE 7 | SE 7 | SE 7 | SSE 7 | SSE 7 | SSE 7 | |
40 | 28 | 28 | 18 | 11 | 9 | 6 | 5 | 5 | 5 | 5 | 2 | 7 | 54 | 18 | 18 | 68 | 84 | 40 | 47 | 49 | 43 | 34 | 35 | |
Wind (km/h) | ||||||||||||||||||||||||
off | off | off | off | off | off | off | off | off | off | cross-off | cross-off | off | off | off | off | cross-off | cross | cross | cross-off | cross-off | off | off | cross-off | |
High Tide | 10:14PM1.25m | 7:58AM1.23m | 11:05PM1.24m | 9:12AM1.13m | 11:53PM1.23m | |||||||||||||||||||
Low Tide | 2:39PM0.11m | 3:10AM0.97m | 3:31PM0.23m | 4:29AM0.92m | 4:29PM0.36m | 5:51AM0.82m | ||||||||||||||||||
 | |  |  | | | | | | | | | | |  | |  | | | | |  | | | |
 | — | — | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:31 | — | — |
 | — | — | 6:43 | — | — | — | — | — | — | — | 6:44 | — | — | — | — | — | — | — | 6:45 | — | — | — | — | 6:45 |
1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | |
Temp °C | 15 | 14 | 14 | 13 | 13 | 13 | 13 | 14 | 16 | 18 | 18 | 17 | 17 | 17 | 17 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 18 | 20 |
7 | 6 | 6 | 5 | 6 | 7 | 6 | 8 | 11 | 14 | 14 | 13 | 14 | 14 | 14 | 15 | 18 | 19 | 18 | 20 | 20 | 19 | 18 | 20 | |
Swell 1 Height (m) Direction Period (s) | S 7 | S 7 | S 7 | SSW 7 | SSW 7 | S 7 | S 7 | S 7 | S 7 | S 7 | S 7 | SE 6 | SE 7 | SE 6 | SE 6 | SE 6 | SSE 6 | SSE 6 | SSE 7 | SE 7 | SE 7 | SSE 7 | SSE 7 | SSE 7 |
 kJ | 40 | 28 | 28 | 18 | 11 | 9 | 4 | 4 | 4 | 4 | 4 | 2 | 7 | 14 | 18 | 18 | 26 | 26 | 40 | 47 | 49 | 43 | 34 | 35 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 11 | SE 11 | E 11 | E 11 | SW 8 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | S 7 | S 6 | E 12 | E 12 | E 12 | E 12 | E 12 | E 11 | E 11 | E 11 | E 11 | SE 11 | E 12 |
| kJ | 4 | 4 | 5 | 2 | 2 | 2 | 5 | 5 | 5 | 5 | 5 | 1 | 1 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 5 | 3 |
Swell 3 Height (m) Direction Period (s) | — | ESE 10 | SSE 7 | E 9 | E 9 | E 11 | SSE 8 | E 6 | E 6 | — | S 6 | SE 7 | E 12 | SE 10 | SE 10 | — | E 10 | E 10 | E 10 | E 10 | — | — | E 12 | S 7 |
| kJ | — | 18 | 9 | 2 | 2 | 2 | 6 | 1 | 1 | — | 1 | 2 | 3 | 4 | 4 | — | 2 | 2 | 7 | 9 | — | — | 3 | 1 |
Wind waves Height (m) Direction Period (s) | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 3 | ENE 2 | E 2 | E 3 | E 3 | SE 6 | — | — | SE 6 | SE 7 | — | — | — | — | — | — |
| kJ | 15 | 16 | 18 | 21 | 16 | 11 | 11 | 8 | 5 | 1 | 1 | 1 | 1 | 54 | — | — | 68 | 84 | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 145 | 145 | 145 | 145 | 552 | 552 | 798 | 798 | 38 | 38 | 38 | 885 | 794 | 0 | 16 | 38 | 0 | 12 | 38 | 0 | 0 | 38 | 38 | 16 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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