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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 pm Thursday 07 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 8PM is: 0.4m 10s primary swell from a East-southeast direction and 0.1m 11s secondary swell from a Southeast direction, 0.7m 6s secondary swell from a South direction (forecast issued at 02:00pm May 07). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (07 May) | - | - |
| Afternoon (07 May) | 1.5ft (0.4m) | 10s |
| Evening (07 May) | 2.5ft (0.7m) | 6s |
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 16°C on Sat night). Winds decreasing (strong winds from the SW on Fri night, calm by Sun morning). | ||||||||||||||||||||||||
Thu 7 | Friday 8 | Saturday 9 | Sun 10 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
ESE 10 | SE 10 | S 6 | S 6 | S 6 | S 6 | S 6 | S 6 | S 6 | SSW 6 | SSW 6 | SSW 6 | S 7 | SW 7 | SW 7 | SSW 7 | SSW 8 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 10 | SE 10 | |
43 | 28 | 42 | 36 | 61 | 65 | 50 | 48 | 92 | 122 | 186 | 253 | 218 | 407 | 309 | 62 | 49 | 18 | 18 | 18 | 18 | 18 | 17 | 16 | |
Wind (km/h) | ||||||||||||||||||||||||
on | cross-on | on | on | on | on | on | on | on | on | on | on | on | cross-on | cross | cross-off | off | on | on | cross | cross-off | cross-off | off | off | |
High Tide | 10:01PM1.22m | 7:30AM1.26m | 11:05PM1.19m | 8:28AM1.17m | 00:05AM1.19m | |||||||||||||||||||
Low Tide | 2:24PM0.05m | 2:34AM0.99m | 3:16PM0.16m | 3:50AM0.99m | 4:16PM0.27m | 5:29AM0.93m | ||||||||||||||||||
 | | |  |  | | |  | | |  | | |  | | | | | | | | | | | |
 | — | — | — | — | — | 4:43 | — | — | — | — | — | — | — | 4:43 | — | — | — | — | — | — | — | 4:41 | — | — |
 | — | — | 6:30 | — | — | — | — | — | — | — | 6:31 | — | — | — | — | — | — | — | 6:32 | — | — | — | — | 6:34 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 19 | 19 | 19 | 20 | 20 | 19 | 19 | 20 | 21 | 21 | 21 | 20 | 20 | 18 | 18 | 18 | 20 | 20 | 18 | 18 | 18 | 17 | 16 | 17 |
17 | 17 | 18 | 18 | 19 | 18 | 18 | 19 | 18 | 16 | 16 | 12 | 13 | 16 | 14 | 14 | 15 | 17 | 14 | 15 | 15 | 12 | 10 | 12 | |
Swell 1 Height (m) Direction Period (s) | SE 11 | SE 11 | SE 11 | ESE 11 | ESE 11 | S 6 | S 6 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | SE 11 | SE 11 | SSW 7 | SSW 8 | SSW 7 | SSW 8 | SSW 7 | SE 11 | SE 11 | SSW 6 | SE 11 | SE 10 | SE 10 |
 kJ | 4 | 4 | 4 | 11 | 11 | 65 | 50 | 11 | 11 | 11 | 12 | 5 | 5 | 208 | 151 | 62 | 49 | 16 | 18 | 18 | 8 | 18 | 17 | 16 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | SE 10 | ESE 10 | — | — | ESE 11 | ESE 11 | — | — | — | — | — | — | SE 11 | SE 11 | ESE 11 | SE 11 | SE 11 | S 7 | SSW 6 | SE 11 | SSW 6 | S 6 | S 6 |
| kJ | 43 | 28 | 42 | — | — | 11 | 11 | — | — | — | — | — | — | 5 | 5 | 11 | 18 | 18 | 4 | 8 | 18 | 7 | 3 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 8 | SW 8 | SW 8 | SW 8 | S 7 | S 6 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | 2 | 2 | 2 | 1 | 1 | — |
Wind waves Height (m) Direction Period (s) | SSE 6 | S 4 | S 6 | S 6 | S 6 | — | — | S 6 | S 6 | SSW 6 | SSW 6 | SSW 6 | S 7 | SW 7 | SW 7 | — | — | — | S 3 | SSW 3 | — | — | — | — |
| kJ | 22 | 23 | 36 | 36 | 61 | — | — | 48 | 92 | 122 | 186 | 253 | 218 | 407 | 309 | — | — | — | 5 | 2 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 77 | 77 | 491 | 38 | 14 | 12 | 38 | 92 | 505 | 505 | 487 | 487 | 487 | 3 | 17 | 0 | 0 | 38 | 77 | 51 | 122 | 51 | 74 | 51 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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