Surf Forecasts:
How big are the waves at Rock Island today (18 Aug):
- Morning surf: Morning surf (18 Aug, local time) - 0.5ft (0.2m), 8s period with SSW swell.
- Afternoon surf: Afternoon surf (18 Aug, local time) - 0.5ft (0.2m), 8s period with SSW swell.
- Evening surf: Evening surf (18 Aug, local time) - 1.5ft (0.4m), 6s period with SE swell.
The current surf forecast for Rock Island at 11AM is: 0.2m 8s primary swell from a South-southwest direction and 0.2m 6s secondary swell from a South-southeast direction (forecast issued at 02:00am August 18). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Aug) | 0.5ft (0.2m) | 8s |
| Afternoon (18 Aug) | 0.5ft (0.2m) | 8s |
| Evening (18 Aug) | 1.5ft (0.4m) | 6s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Warm (max 28°C on Wed afternoon, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||||||||||
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) | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SSE 6 | SSE 6 | SSE 6 | SE 6 | SSW 8 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSW 9 | SSW 9 | S 10 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 7 | 7 | 6 | 6 | 6 | 6 | 7 | 10 | 10 | 10 | 10 | 6 | 4 | 7 | 4 | 9 | 6 | 4 | 4 | 4 | 4 | 8 | 8 | 8 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | glassy | on | on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | glassy | on | on | cross-on | cross-on | glassy | glassy | glassy | on | on | on | cross-on |
High Tide | 8:00AM1.43m | 8:06PM1.47m | 8:53AM1.34m | 8:32PM1.46m | 9:59AM1.24m | 9:00PM1.45m | ||||||||||||||||||
Low Tide | 1:51AM0.52m | 1:59PM0.61m | 2:34AM0.48m | 2:29PM0.75m | 3:23AM0.45m | 3:00PM0.90m | ||||||||||||||||||
 | |  |  | | |  |  |  | |  | | | | | | | | | | | | | | |
 | — | 5:01 | — | — | — | — | — | — | — | 5:03 | — | — | — | — | — | — | — | 5:03 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:28 | — | — | — | — | — | — | — | 6:27 | — | — | — | — | — | — | — | 6:24 | — |
mm | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 26 | 27 | 28 | 27 | 26 | 25 | 25 | 25 | 26 | 27 | 27 | 27 | 26 |
Feels °C | 30 | 30 | 28 | 30 | 30 | 28 | 29 | 28 | 29 | 29 | 29 | 30 | 30 | 29 | 29 | 29 | 28 | 29 | 29 | 30 | 30 | 28 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 8 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SSE 6 | SE 10 | SSE 6 | SE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSW 9 | SSW 8 |
| kJ | 7 | 3 | 3 | 3 | 3 | 4 | 7 | 10 | 10 | 10 | 10 | 6 | 4 | 4 | 3 | 9 | 3 | 3 | 3 | 3 | 3 | 3 | 8 | 7 |
Swell 2 Height (m) Direction Period (s) | SSE 6 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SE 10 | SE 10 | SE 6 | SW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 11 | SSW 9 | SSE 6 | SE 11 |
| kJ | 3 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 4 | 4 | 2 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 8 | 3 | 4 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SSW 8 | SSW 8 | SE 10 | SSW 8 | SW 8 | SW 8 | SSW 8 | SW 8 | SW 8 | SW 8 | S 9 | SE 11 | SE 11 | S 10 |
| kJ | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 6 | 6 | 4 | 6 | 3 | 2 | 6 | 2 | 2 | 2 | 2 | 4 | 4 | 8 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | SSE 2 | — | — | — | — | — | — | SSE 6 | — | — | — | — | — | — | — | S 2 | S 3 | SSE 6 |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 7 | — | — | — | — | — | — | — | 1 | 1 | 6 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 51 | 51 | 51 | 51 | 51 | 18 | 51 | 51 | 51 | 51 | 65 | 74 | 77 | 18 | 51 | 77 | 77 | 54 | 76 | 51 | 77 | 77 | 77 | 76 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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