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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 pm Saturday 23 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 12AM is: 0.2m 12s primary swell from a East-southeast direction and 0.4m 6s secondary swell from a Southeast direction, 0.1m 12s secondary swell from a East direction (forecast issued at 08:00pm May 23). An open ocean swell of 0.3m 2s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (24 May) | 1.5ft (0.4m) | 6s |
| Afternoon (24 May) | 2ft (0.6m) | 6s |
| Evening (24 May) | 2.5ft (0.7m) | 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 Mon afternoon, min 16°C on Sat night). Wind will be generally light. | ||||||||||||||||||||||||
Sat 23 | Sunday 24 | Monday 25 | Tuesday 26 | |||||||||||||||||||||
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 |   |    |    |    | ||||||||||||||||||||
S 7 | ESE 6 | SE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 7 | SSE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | |
2 | 3 | 14 | 15 | 15 | 15 | 26 | 27 | 40 | 42 | 53 | 54 | 56 | 44 | 45 | 36 | 147 | 29 | 21 | 23 | 21 | 16 | 17 | 17 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | off | off | off | off | off | off | cross-off | cross | cross-off | cross-off | off | off | off | cross-off | cross-on | cross-on | glassy | glassy | glassy | cross-off | cross-off | glassy | on | |
High Tide | 11:05PM1.24m | 9:12AM1.13m | 11:53PM1.23m | 10:52AM1.06m | 00:37AM1.24m | 12:39PM1.06m | ||||||||||||||||||
Low Tide | 3:31PM0.23m | 4:29AM0.92m | 4:29PM0.36m | 5:51AM0.82m | 5:34PM0.48m | 7:00AM0.68m | ||||||||||||||||||
 |  | | | | |  | |  |  | |  | | | | | | | | | | | | | |
 | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:31 | — | — | — | — |
 | 6:44 | — | — | — | — | — | — | — | 6:45 | — | — | — | — | — | — | — | 6:45 | — | — | — | — | — | — | 6:45 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 16 | 16 | 16 | 16 | 16 | 16 | 18 | 20 | 20 | 19 | 19 | 19 | 19 | 20 | 23 | 24 | 22 | 21 | 20 | 20 | 20 | 21 | 22 | 22 |
12 | 12 | 12 | 12 | 12 | 12 | 16 | 20 | 20 | 19 | 19 | 19 | 18 | 19 | 21 | 23 | 22 | 23 | 22 | 21 | 21 | 22 | 23 | 22 | |
Swell 1 Height (m) Direction Period (s) | SE 6 | ESE 6 | SE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 7 | SSE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 |
 kJ | 1 | 3 | 10 | 15 | 15 | 15 | 26 | 27 | 40 | 42 | 53 | 54 | 56 | 44 | 45 | 36 | 37 | 29 | 21 | 23 | 21 | 16 | 17 | 17 |
Swell 2 Height (m) Direction Period (s) | S 7 | SE 7 | E 12 | E 12 | E 12 | E 12 | — | E 10 | E 10 | E 11 | E 11 | E 12 | E 12 | E 12 | S 9 | SSW 9 | SSW 8 | S 8 | S 8 | S 7 | S 7 | S 7 | S 7 | S 7 |
| kJ | 1 | 2 | 3 | 3 | 3 | 3 | — | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 2 | 8 | 13 | 10 | 10 | 9 | 9 | 8 | 8 | 8 |
Swell 3 Height (m) Direction Period (s) | SE 7 | S 7 | ESE 12 | ESE 12 | — | — | E 12 | — | E 10 | E 9 | — | — | E 16 | S 10 | E 13 | E 14 | E 10 | S 12 | E 15 | — | E 15 | E 15 | E 15 | S 10 |
| kJ | 2 | 1 | 14 | 14 | — | — | 3 | — | 8 | 6 | — | — | 5 | 2 | 3 | 4 | 8 | 3 | 4 | — | 4 | 4 | 4 | 2 |
Wind waves Height (m) Direction Period (s) | NE 3 | NE 3 | NE 2 | NNE 2 | NNE 3 | NNE 3 | — | — | — | — | — | — | — | — | — | — | SE 8 | — | — | — | — | — | — | — |
| kJ | 2 | 1 | 1 | 1 | 2 | 1 | — | — | — | — | — | — | — | — | — | — | 147 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 552 | 38 | 552 | 38 | 51 | 51 | 16 | 38 | 0 | 0 | 0 | 0 | 0 | 38 | 0 | 18 | 14 | 38 | 16 | 38 | 38 | 51 | 16 | 18 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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