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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 pm 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 (29 May):
- Morning surf: Morning surf (29 May, local time) - 3ft (0.9m), 7s period with SSW swell.
- Afternoon surf: Afternoon surf (29 May, local time) - 2.5ft (0.7m), 7s period with S swell.
- Evening surf: Evening surf (29 May, local time) - 2.5ft (0.7m), 7s period with S swell.
The current surf forecast for Rock Island at 4AM is: 1.5m 7s primary swell from a South-southwest direction and 1.0m 7s secondary swell from a South direction, 0.1m 8s secondary swell from a East direction (forecast issued at 08:00pm May 28). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (29 May) | 3ft (0.9m) | 7s |
| Afternoon (29 May) | 2.5ft (0.7m) | 7s |
| Evening (29 May) | 2.5ft (0.7m) | 7s |
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 Fri night. Warm (max 25°C on Fri morning, min 20°C on Fri night). Wind will be generally light. | ||||||||||||||||||||||||
Thu 28 | Friday 29 | Saturday 30 | Sunday 31 | |||||||||||||||||||||
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 5 | S 6 | SSW 7 | SSW 7 | S 7 | SSW 7 | S 7 | S 7 | S 7 | S 7 | S 7 | E 7 | SSW 7 | SE 6 | SSE 6 | S 6 | S 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | S 15 | S 13 | S 13 | |
13 | 37 | 181 | 229 | 100 | 86 | 64 | 49 | 49 | 49 | 36 | 23 | 9 | 10 | 8 | 20 | 19 | 13 | 13 | 13 | 7 | 39 | 31 | 51 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | cross-on | glassy | glassy | off | cross | cross-off | cross-off | cross-off | cross-off | off | glassy | on | on | on | on | on | glassy | cross-off | cross | cross-on | on | |
High Tide | 3:19PM1.20m | 2:25AM1.33m | 4:17PM1.27m | 2:58AM1.37m | 5:08PM1.33m | 3:31AM1.41m | ||||||||||||||||||
Low Tide | 8:40PM0.75m | 9:23AM0.21m | 9:28PM0.82m | 10:04AM0.08m | 10:12PM0.88m | 10:43AM-0.02m | ||||||||||||||||||
 |  |  | |  | | |  | | | |  | | | | | |  | | | | | | | |
 | — | — | — | 4:28 | — | — | — | — | — | — | — | 4:28 | — | — | — | — | — | — | — | 4:28 | — | — | — | — |
 | 6:47 | — | — | — | — | — | — | — | 6:47 | — | — | — | — | — | — | — | 6:49 | — | — | — | — | — | — | 6:50 |
— | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 22 | 22 | 22 | 22 | 23 | 23 | 25 | 23 | 22 | 21 | 20 | 20 | 20 | 21 | 22 | 23 | 22 | 22 | 21 | 21 | 21 | 22 | 23 | 24 |
23 | 23 | 23 | 24 | 27 | 26 | 27 | 22 | 21 | 21 | 20 | 20 | 19 | 20 | 19 | 20 | 19 | 21 | 21 | 22 | 21 | 22 | 22 | 22 | |
Swell 1 Height (m) Direction Period (s) | ESE 10 | SE 10 | S 7 | S 7 | S 7 | SSW 7 | S 7 | S 7 | S 7 | S 7 | S 7 | SSW 7 | ESE 6 | SE 6 | SSE 6 | SE 12 | SE 12 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | S 13 |
 kJ | 9 | 4 | 71 | 94 | 100 | 86 | 64 | 49 | 49 | 49 | 36 | 9 | 8 | 10 | 8 | 5 | 6 | 13 | 13 | 13 | 7 | 7 | 6 | 51 |
Swell 2 Height (m) Direction Period (s) | E 13 | E 7 | SE 10 | E 8 | E 8 | ESE 12 | SE 12 | SE 12 | SE 12 | ESE 12 | ESE 12 | SSE 6 | SSW 7 | SSW 7 | SW 7 | S 13 | SSE 6 | SE 12 | S 3 | SE 11 | S 15 | S 15 | S 13 | SSW 16 |
| kJ | 3 | 1 | 4 | 1 | 1 | 14 | 6 | 6 | 6 | 14 | 14 | 8 | 9 | 5 | 2 | 3 | 14 | 6 | 1 | 5 | 5 | 39 | 31 | 50 |
Swell 3 Height (m) Direction Period (s) | S 9 | E 13 | E 8 | SE 12 | E 12 | — | S 15 | S 15 | S 14 | S 14 | S 9 | SE 12 | SSE 6 | SE 12 | SE 12 | — | SW 7 | SW 7 | SE 11 | S 13 | SE 11 | SE 12 | S 16 | SE 12 |
| kJ | 2 | 3 | 1 | 6 | 3 | — | 4 | 4 | 4 | 4 | 2 | 5 | 4 | 5 | 5 | — | 12 | 8 | 5 | 3 | 5 | 6 | 20 | 6 |
Wind waves Height (m) Direction Period (s) | S 5 | S 6 | SSW 7 | SSW 7 | — | — | — | — | ESE 3 | E 2 | E 3 | E 7 | — | — | — | S 6 | S 6 | S 3 | WSW 2 | — | — | — | — | S 6 |
| kJ | 13 | 37 | 181 | 229 | — | — | — | — | 4 | 1 | 2 | 23 | — | — | — | 20 | 19 | 1 | 1 | — | — | — | — | 10 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 77 | 136 | 14 | 12 | 0 | 0 | 0 | 64 | 136 | 0 | 0 | 38 | 16 | 16 | 16 | 77 | 76 | 38 | 38 | 76 | 16 | 16 | 18 | 77 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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