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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 am Thursday 28 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
21.0° C
(Which is slightly cooler than normal)How big are the waves at Rock Island today (28 May):
- Morning surf: Morning surf (28 May, local time) - 0.5ft (0.2m), 10s period with ESE swell.
- Afternoon surf: Afternoon surf (28 May, local time) - 0.5ft (0.2m), 9s period with ESE swell.
- Evening surf: Evening surf (28 May, local time) - 2.5ft (0.7m), 6s period with S swell.
The current surf forecast for Rock Island at 3PM is: 0.2m 9s primary swell from a East-southeast direction and 0.1m 9s secondary swell from a South direction, 0.5m 3s secondary swell from a South direction (forecast issued at 08:00am May 28). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (28 May) | 0.5ft (0.2m) | 10s |
| Afternoon (28 May) | 0.5ft (0.2m) | 9s |
| Evening (28 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 ForecastLight rain (total 2mm), mostly falling on Fri night. Warm (max 25°C on Fri morning, min 19°C on Fri night). Wind will be generally light. | ||||||||||||||||||||||||
Thursday 28 | Friday 29 | Saturday 30 | Sun 31 | |||||||||||||||||||||
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 | 6 PM | 9 PM | 12 AM | 3 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SE 10 | ESE 10 | ESE 9 | ESE 9 | S 5 | S 6 | SSW 7 | SSW 6 | SSW 7 | SSW 7 | S 7 | S 7 | S 7 | S 7 | S 7 | S 7 | SSW 7 | SE 7 | SSE 6 | SSE 6 | SW 7 | SW 7 | SSE 6 | SSE 6 | |
15 | 9 | 8 | 8 | 11 | 39 | 139 | 101 | 79 | 67 | 48 | 47 | 46 | 34 | 33 | 33 | 15 | 7 | 16 | 7 | 14 | 13 | 13 | 13 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | cross-on | on | on | on | on | cross-on | glassy | glassy | off | cross | cross | off | cross-off | glassy | cross-off | glassy | cross-on | on | on | on | on | glassy | |
High Tide | 3:19PM1.20m | 2:25AM1.33m | 4:17PM1.27m | 2:58AM1.37m | 5:08PM1.33m | |||||||||||||||||||
Low Tide | 8:41AM0.36m | 8:40PM0.75m | 9:23AM0.21m | 9:28PM0.82m | 10:04AM0.08m | 10:12PM0.88m | ||||||||||||||||||
 |  | | | |  |  | |  | | | | | |  | | | | | | | | | | |
 | 4:30 | — | — | — | — | — | — | 4:28 | — | — | — | — | — | — | — | 4:28 | — | — | — | — | — | — | — | 4:28 |
 | — | — | — | — | 6:47 | — | — | — | — | — | — | — | 6:47 | — | — | — | — | — | — | — | 6:49 | — | — | 6:50 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | |
Temp °C | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 25 | 22 | 22 | 22 | 22 | 21 | 19 | 20 | 22 | 23 | 23 | 22 | 21 | 21 |
20 | 21 | 21 | 22 | 22 | 22 | 23 | 25 | 27 | 26 | 27 | 21 | 22 | 23 | 23 | 22 | 18 | 20 | 21 | 21 | 22 | 22 | 21 | 22 | |
Swell 1 Height (m) Direction Period (s) | SE 10 | ESE 10 | ESE 9 | ESE 9 | ESE 10 | SE 10 | S 7 | S 7 | SSW 7 | SSW 7 | S 7 | S 7 | S 7 | S 7 | S 7 | S 7 | SSW 7 | S 6 | SSE 6 | SE 12 | SSE 6 | SSE 6 | SSE 6 | SSE 6 |
 kJ | 15 | 9 | 8 | 8 | 9 | 4 | 57 | 61 | 79 | 67 | 48 | 47 | 46 | 34 | 33 | 33 | 15 | 7 | 16 | 5 | 14 | 13 | 13 | 13 |
Swell 2 Height (m) Direction Period (s) | E 13 | E 13 | SE 10 | S 9 | E 13 | SE 8 | SE 10 | SE 8 | SE 8 | ESE 12 | ESE 12 | ESE 12 | ESE 12 | SE 12 | SE 12 | SE 12 | SE 6 | SE 7 | SSW 7 | S 13 | SE 13 | SE 12 | SE 11 | SE 11 |
| kJ | 3 | 3 | 4 | 2 | 3 | 2 | 4 | 3 | 2 | 14 | 14 | 14 | 14 | 6 | 6 | 5 | 10 | 7 | 5 | 3 | 6 | 6 | 5 | 5 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | E 13 | E 13 | S 9 | E 13 | SE 7 | SE 10 | SE 12 | — | S 15 | S 15 | S 14 | S 14 | S 14 | S 14 | E 12 | SSW 7 | SE 12 | SSE 6 | SW 7 | SW 7 | S 13 | S 16 |
| kJ | 4 | 4 | 3 | 3 | 2 | 3 | 2 | 4 | 6 | — | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 5 | 5 | 7 | 12 | 12 | 3 | 5 |
Wind waves Height (m) Direction Period (s) | SSW 3 | S 4 | S 4 | S 3 | S 5 | S 6 | SSW 7 | SSW 6 | — | — | — | E 2 | ESE 3 | ESE 5 | — | — | — | — | — | — | S 3 | S 3 | — | — |
| kJ | 4 | 6 | 4 | 6 | 11 | 39 | 139 | 101 | — | — | — | 1 | 6 | 14 | — | — | — | — | — | — | 1 | 1 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 38 | 77 | 64 | 77 | 77 | 38 | 12 | 10 | 0 | 0 | 0 | 64 | 38 | 2 | 38 | 38 | 51 | 38 | 16 | 64 | 77 | 51 | 51 | 16 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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