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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 pm Tuesday 26 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
20.5° C
(Which is slightly cooler than normal)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 10PM is: 0.4m 8s primary swell from a Southeast direction and 0.2m 6s secondary swell from a South direction (forecast issued at 02:00pm May 26). The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (26 May) | - | - |
| Afternoon (26 May) | 1.5ft (0.4m) | 8s |
| Evening (26 May) | 1.5ft (0.4m) | 8s |
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 Thu morning. Warm (max 24°C on Wed morning, min 20°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||||||
Tue 26 | Wednesday 27 | Thursday 28 | Fri 29 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | ESE 8 | ESE 10 | ESE 13 | ESE 10 | S 4 | S 5 | S 6 | S 6 | S 7 | SSW 7 | SSW 7 | SSW 8 | |
20 | 21 | 16 | 21 | 20 | 9 | 14 | 9 | 9 | 15 | 9 | 9 | 6 | 9 | 17 | 9 | 9 | 14 | 32 | 74 | 157 | 397 | 263 | 270 | |
Wind (km/h) | ||||||||||||||||||||||||
glassy | on | cross-on | cross-off | glassy | off | off | off | cross-off | on | on | on | on | on | on | glassy | glassy | on | on | on | on | cross-on | cross-on | cross-on | |
High Tide | 12:39PM1.06m | 1:15AM1.26m | 2:09PM1.12m | 1:51AM1.29m | 3:19PM1.20m | 2:25AM1.33m | ||||||||||||||||||
Low Tide | 6:41PM0.59m | 7:54AM0.52m | 7:44PM0.68m | 8:41AM0.36m | 8:40PM0.75m | |||||||||||||||||||
 |  | |  | |  |  | | | | | |  | | |  | | | | | | | | | |
 | — | — | — | — | — | 4:30 | — | — | — | — | — | — | — | 4:30 | — | — | — | — | — | — | — | 4:28 | — | — |
 | — | — | 6:45 | — | — | — | — | — | — | — | 6:46 | — | — | — | — | — | — | — | 6:47 | — | — | — | — | 6:47 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | |
Temp °C | 23 | 23 | 23 | 22 | 21 | 21 | 21 | 22 | 24 | 24 | 23 | 22 | 21 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 22 | 22 | 23 |
24 | 23 | 23 | 23 | 23 | 21 | 21 | 22 | 24 | 24 | 23 | 21 | 18 | 18 | 19 | 23 | 23 | 23 | 23 | 22 | 21 | 23 | 24 | 25 | |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | ESE 8 | ESE 10 | ESE 10 | S 4 | SSE 5 | SE 8 | SE 10 | SE 7 | E 8 | SSW 7 | SSW 7 | S 7 |
 kJ | 20 | 21 | 16 | 21 | 20 | 9 | 14 | 9 | 9 | 15 | 9 | 9 | 6 | 9 | 9 | 3 | 4 | 2 | 4 | 2 | 1 | 186 | 140 | 112 |
Swell 2 Height (m) Direction Period (s) | S 7 | S 6 | S 6 | S 6 | S 6 | S 6 | S 6 | SE 10 | SE 10 | S 6 | SE 10 | SE 10 | SE 10 | E 13 | E 13 | ESE 10 | ESE 9 | SE 9 | SE 7 | SE 10 | E 12 | SE 12 | SE 12 | SE 12 |
| kJ | 4 | 3 | 3 | 3 | 1 | 1 | 1 | 4 | 4 | 1 | 4 | 4 | 4 | 4 | 3 | 9 | 8 | 3 | 2 | 4 | 3 | 6 | 6 | 6 |
Swell 3 Height (m) Direction Period (s) | S 10 | S 10 | S 11 | SE 11 | SE 11 | SE 11 | SE 11 | S 6 | S 6 | E 14 | E 14 | E 14 | E 13 | SE 10 | ESE 13 | E 13 | SE 10 | S 9 | E 13 | E 12 | ESE 13 | — | S 9 | — |
| kJ | 2 | 2 | 2 | 5 | 5 | 4 | 4 | 1 | 1 | 4 | 4 | 4 | 4 | 4 | 17 | 3 | 4 | 2 | 3 | 3 | 16 | — | 2 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | S 2 | SSW 3 | S 3 | S 4 | S 4 | — | S 4 | S 5 | S 6 | S 6 | S 7 | SSW 7 | SSW 7 | SSW 8 |
| kJ | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 6 | 6 | 5 | — | 9 | 14 | 32 | 74 | 157 | 397 | 263 | 270 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 16 | 16 | 38 | 38 | 16 | 16 | 16 | 51 | 16 | 51 | 18 | 755 | 90 | 77 | 64 | 38 | 16 | 18 | 38 | 14 | 14 | 12 | 7 | 2 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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