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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 pm Monday 27 Apr 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
19.0° 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 4AM is: 0.6m 7s primary swell from a South direction and 0.2m 7s secondary swell from a East-southeast direction (forecast issued at 08:00pm April 27). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (28 Apr) | 2ft (0.6m) | 7s |
| Afternoon (28 Apr) | 3ft (0.9m) | 4s |
| Evening (28 Apr) | 5ft (1.5m) | 6s |
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 Wed night. Warm (max 20°C on Tue afternoon, min 12°C on Wed night). Winds increasing (calm on Mon night, strong winds from the SW by Tue night). | ||||||||||||||||||||||||
Mon 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | |||||||||||||||||||||
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 | S 7 | SSW 7 | SSW 7 | S 7 | SSW 7 | S 4 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | S 6 | SSW 6 | SSW 6 | SW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SE 9 | |
77 | 60 | 55 | 43 | 27 | 37 | 12 | 28 | 74 | 129 | 131 | 108 | 190 | 81 | 132 | 51 | 159 | 39 | 23 | 8 | 8 | 4 | 4 | 3 | |
Wind (km/h) | ||||||||||||||||||||||||
off | cross-off | glassy | on | on | on | on | on | cross-on | on | on | cross-on | cross-on | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | cross-off | cross-off | |
High Tide | 2:30AM1.21m | 2:21PM1.14m | 2:59AM1.25m | 3:25PM1.22m | 3:26AM1.28m | |||||||||||||||||||
Low Tide | 7:39PM0.41m | 8:35AM0.62m | 8:36PM0.45m | 9:15AM0.46m | 9:24PM0.50m | 9:51AM0.30m | ||||||||||||||||||
 |  | |  |  |  | |  | |  | | | | | | | | |  | | | | | | |
 | — | — | — | 4:54 | — | — | — | — | — | — | — | 4:52 | — | — | — | — | — | — | — | 4:52 | — | — | — | — |
 | 6:22 | — | — | — | — | — | — | — | 6:23 | — | — | — | — | — | — | — | 6:24 | — | — | — | — | — | — | 6:25 |
1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | |
Temp °C | 17 | 16 | 15 | 16 | 17 | 17 | 18 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 17 | 15 | 13 | 13 | 12 | 13 | 15 | 16 |
11 | 13 | 15 | 14 | 13 | 13 | 13 | 15 | 14 | 13 | 14 | 16 | 18 | 17 | 18 | 17 | 12 | 10 | 7 | 8 | 6 | 8 | 11 | 13 | |
Swell 1 Height (m) Direction Period (s) | S 7 | S 7 | SSW 7 | SSW 7 | S 7 | SE 7 | SE 7 | SE 7 | — | ESE 7 | E 8 | — | SSW 6 | S 6 | SSW 6 | E 11 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SE 9 |
 kJ | 77 | 60 | 55 | 43 | 27 | 2 | 2 | 2 | — | 5 | 5 | — | 92 | 81 | 53 | 2 | 66 | 39 | 23 | 8 | 8 | 4 | 4 | 3 |
Swell 2 Height (m) Direction Period (s) | S 16 | — | SE 7 | ESE 7 | SE 7 | — | — | — | — | SE 11 | SE 11 | E 9 | S 13 | S 13 | — | SE 11 | SE 11 | — | — | SE 8 | SE 8 | SE 8 | SE 9 | S 6 |
| kJ | 5 | — | 8 | 5 | 2 | — | — | — | — | 5 | 5 | 2 | 3 | 3 | — | 5 | 5 | — | — | 3 | 3 | 3 | 3 | 1 |
Swell 3 Height (m) Direction Period (s) | — | S 16 | — | — | — | S 14 | S 14 | S 14 | SE 12 | S 14 | S 14 | SE 11 | S 13 | SE 11 | — | S 13 | S 13 | — | — | S 12 | — | — | — | E 7 |
| kJ | — | 5 | — | — | — | 4 | 4 | 4 | 5 | 4 | 4 | 5 | 3 | 5 | — | 3 | 3 | — | — | 3 | — | — | — | 1 |
Wind waves Height (m) Direction Period (s) | NNE 2 | NE 3 | — | — | — | SSW 7 | S 4 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | — | SSW 6 | SSW 6 | SW 6 | NE 3 | NE 3 | NE 3 | NE 3 | NE 3 | NE 3 | ESE 2 |
| kJ | 1 | 1 | — | — | — | 37 | 12 | 28 | 74 | 129 | 131 | 108 | 190 | — | 132 | 51 | 159 | 8 | 7 | 5 | 6 | 3 | 1 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 27 | 10 | 0 | 18 | 76 | 77 | 77 | 2073 | 798 | 514 | 228 | 514 | 10 | 0 | 0 | 0 | 38 | 804 | 104 | 1030 | 1030 | 1030 | 1424 | 1431 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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