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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 pm Wednesday 06 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
20.3° C
(Which is slightly warmer than usual)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 1AM is: 0.5m 6s primary swell from a South-southeast direction and 0.1m 11s secondary swell from a Southeast direction (forecast issued at 08:00pm May 06). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (07 May) | 1.5ft (0.4m) | 6s |
| Afternoon (07 May) | 2ft (0.6m) | 7s |
| Evening (07 May) | 3.5ft (1.0m) | 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 21°C on Fri morning, min 18°C on Wed night). Winds increasing (calm on Wed night, strong winds from the SW by Fri night). | ||||||||||||||||||||||||
Wed 6 | Thursday 7 | Friday 8 | Saturday 9 | |||||||||||||||||||||
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 |   |    |    |    | ||||||||||||||||||||
SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 7 | S 7 | S 7 | S 7 | S 6 | S 6 | S 6 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | SSW 7 | SW 7 | SSW 8 | SSW 8 | SSW 8 | |
26 | 18 | 18 | 19 | 13 | 13 | 16 | 42 | 77 | 94 | 92 | 68 | 49 | 38 | 25 | 94 | 126 | 159 | 225 | 232 | 470 | 107 | 67 | 45 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | glassy | off | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | cross-on | on | cross-on | on | on | |
High Tide | 9:02PM1.26m | 6:48AM1.34m | 10:01PM1.22m | 7:30AM1.26m | 11:05PM1.19m | 8:28AM1.17m | ||||||||||||||||||
Low Tide | 1:42AM0.97m | 2:24PM0.05m | 2:34AM0.99m | 3:16PM0.16m | 3:50AM0.99m | |||||||||||||||||||
 |  | |  |  | | |  | |  | | | | | | | | | | | | | | | |
 | — | — | — | 4:45 | — | — | — | — | — | — | — | 4:43 | — | — | — | — | — | — | — | 4:43 | — | — | — | — |
 | 6:30 | — | — | — | — | — | — | — | 6:30 | — | — | — | — | — | — | — | 6:31 | — | — | — | — | — | — | 6:32 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 18 | 18 | 18 | 18 | 18 | 19 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 20 | 21 | 21 | 21 | 20 | 20 | 18 | 18 | 18 | 18 | 18 |
19 | 17 | 18 | 18 | 19 | 19 | 20 | 18 | 17 | 16 | 17 | 18 | 18 | 19 | 18 | 16 | 15 | 12 | 13 | 14 | 16 | 15 | 13 | 12 | |
Swell 1 Height (m) Direction Period (s) | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | S 6 | ESE 11 | SE 11 | SE 11 | ESE 11 | ESE 11 | SE 11 | SE 11 | SSW 7 | SSW 8 | SSW 8 | SE 11 |
 kJ | 26 | 18 | 18 | 19 | 13 | 13 | 16 | 4 | 4 | 4 | 4 | 4 | 49 | 11 | 18 | 18 | 12 | 12 | 5 | 5 | 199 | 107 | 67 | 18 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | ESE 10 | — | SE 10 | SE 10 | — | ESE 11 | SSE 6 | — | — | — | ESE 8 | — | — | ESE 11 | ESE 11 | SE 11 | S 8 |
| kJ | 4 | 5 | 4 | 4 | 4 | 4 | 4 | 42 | — | 52 | 53 | — | 11 | 21 | — | — | — | 6 | — | — | 11 | 11 | 18 | 1 |
Swell 3 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 9 | E 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 3 | 3 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | SSE 7 | S 7 | S 7 | S 7 | S 6 | SW 6 | S 6 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | SSW 7 | SW 7 | — | — | SSW 8 |
| kJ | — | — | — | — | — | — | — | 34 | 77 | 94 | 92 | 68 | 43 | 38 | 25 | 94 | 126 | 159 | 225 | 232 | 470 | — | — | 45 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 92 | 90 | 18 | 18 | 16 | 16 | 16 | 76 | 77 | 27 | 27 | 14 | 27 | 14 | 470 | 488 | 142 | 487 | 487 | 10 | 12 | 17 | 55 | 77 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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