Surf Forecasts:
How big are the waves at Rock Island today (20 Jun):
- Morning surf: Morning surf (20 Jun, local time) - 0.5ft (0.2m), 10s period with SSE swell.
- Afternoon surf: Afternoon surf (20 Jun, local time) - 1.5ft (0.4m), 6s period with S swell.
- Evening surf: Evening surf (20 Jun, local time) - 0.5ft (0.2m), 10s period with SSE swell.
The current surf forecast for Rock Island at 8AM is: 0.2m 10s primary swell from a South-southeast direction and 0.2m 7s secondary swell from a South-southwest direction (forecast issued at 02:00am June 20). The wind direction is predicted to be cross-shore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Jun) | 0.5ft (0.2m) | 10s |
| Afternoon (20 Jun) | 1.5ft (0.4m) | 6s |
| Evening (20 Jun) | 0.5ft (0.2m) | 10s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 46mm), heaviest during Sat afternoon. Warm (max 25°C on Sun afternoon, min 20°C on Sat night). Mainly fresh winds. | ||||||||||||||||||||||||
Saturday 20 | Sunday 21 | Monday 22 | ||||||||||||||||||||||
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 | 6 PM | 9 PM | |
Swell Height Map |  |  |  |  |  |  |  |  |  | |||||||||||||||
Wave Height (m) Direction Period (s) | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | S 6 | SSE 4 | SSE 10 | SSE 5 | S 6 | S 6 | SW 6 | SSW 7 | SSW 8 | SW 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 9 | SSW 9 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 10 | 9 | 9 | 9 | 9 | 12 | 13 | 9 | 28 | 171 | 253 | 157 | 60 | 236 | 352 | 105 | 68 | 71 | 75 | 59 | 53 | 39 | 46 | 55 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-off | glassy | cross-off | cross-on | off | off | off | off | glassy | on | cross-on | cross-on | off |
High Tide | 7:09AM1.36m | 9:28PM1.35m | 8:05AM1.28m | 10:04PM1.33m | 9:12AM1.19m | |||||||||||||||||||
Low Tide | 2:01AM0.93m | 2:19PM0.17m | 2:54AM0.87m | 3:02PM0.31m | 3:53AM0.80m | 3:47PM0.46m | ||||||||||||||||||
 | |  | | | |  |  | | | |  | |  | |  | | |  | | | | | | |
 | — | 4:26 | — | — | — | — | — | — | — | 4:26 | — | — | — | — | — | — | — | 4:26 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:59 | — | — | — | — | — | — | — | 6:59 | — | — | — | — | — | — | — | 6:59 | — |
mm | — | — | 1 | 2 | 3 | 4 | 9 | 6 | 7 | 8 | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 23 | 23 | 23 | 22 | 21 | 21 | 20 | 21 | 22 | 22 | 21 | 23 | 23 | 25 | 24 | 23 | 22 | 21 | 22 | 23 | 24 | 24 | 24 |
Feels °C | 25 | 25 | 26 | 25 | 23 | 23 | 23 | 19 | 20 | 19 | 23 | 22 | 26 | 26 | 27 | 23 | 22 | 21 | 20 | 24 | 23 | 24 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | S 6 | S 5 | S 5 | SSW 7 | SSW 6 | SSE 10 | SSE 4 | SSE 10 | SSE 9 | SE 12 | S 6 | S 6 | SSW 7 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 9 | SSW 9 |
| kJ | 5 | 5 | 2 | 5 | 4 | 9 | 7 | 9 | 8 | 6 | 135 | 79 | 60 | 105 | 114 | 105 | 68 | 71 | 75 | 59 | 53 | 39 | 46 | 55 |
Swell 2 Height (m) Direction Period (s) | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SE 12 | SSE 10 | SW 7 | SW 7 | E 10 | SE 12 | SE 11 | SE 6 | SE 6 | SE 9 | SSE 9 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 |
| kJ | 10 | 9 | 9 | 9 | 9 | 6 | 9 | 2 | 2 | 7 | 5 | 5 | 19 | 6 | 3 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Swell 3 Height (m) Direction Period (s) | SSW 7 | SSW 7 | SW 7 | SE 5 | SE 12 | SE 12 | SW 6 | SE 12 | SE 12 | — | SE 9 | SE 9 | SE 11 | SSE 11 | SE 11 | SE 11 | E 16 | SE 6 | E 16 | E 8 | E 10 | E 10 | E 7 | E 7 |
| kJ | 5 | 4 | 2 | 1 | 6 | 6 | 2 | 6 | 6 | — | 3 | 3 | 5 | 12 | 5 | 5 | 5 | 1 | 5 | 1 | 8 | 8 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SSE 5 | S 6 | SSE 4 | SSE 5 | SSE 5 | S 6 | S 6 | SW 6 | — | SSW 8 | SW 7 | — | — | — | — | — | — | SSE 2 | — | — |
| kJ | — | — | — | — | 2 | 12 | 13 | 9 | 28 | 171 | 253 | 157 | — | 236 | 352 | — | — | — | — | — | — | 1 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 77 | 77 | 145 | 145 | 136 | 77 | 77 | 249 | 491 | 136 | 12 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 0 | 0 | 18 | 64 | 17 | 0 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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