Surf Forecasts:
How big are the waves at Rock Island today (18 Aug):
- Afternoon surf: Afternoon surf (18 Aug, local time) - 1ft (0.3m), 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 6PM is: 0.3m 6s primary swell from a Southeast direction and 0.2m 8s secondary swell from a South-southwest direction, 0.2m 2s secondary swell from a South-southeast direction (forecast issued at 02:00pm August 18). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Aug) | - | - |
| Afternoon (18 Aug) | 1ft (0.3m) | 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 Tue afternoon, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | ||||||||||||||||||
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 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SSE 6 | SSE 6 | SSE 6 | SSW 8 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSW 9 | SSW 9 | SSW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 6 | 12 | 7 | 10 | 10 | 10 | 10 | 10 | 6 | 7 | 4 | 4 | 6 | 4 | 4 | 4 | 4 | 8 | 8 | 7 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | glassy | on | cross-on | cross-on | cross-on | glassy | glassy | cross-on | on | on | on | on |
High Tide | 8:06PM1.47m | 8:53AM1.34m | 8:32PM1.46m | 9:59AM1.24m | 9:00PM1.45m | |||||||||||||||
Low Tide | 1:59PM0.61m | 2:34AM0.48m | 2:29PM0.75m | 3:23AM0.45m | 3:00PM0.90m | |||||||||||||||
 | |  |  | | | | | | | | | | | | | | | |  | |
 | — | — | — | — | — | 5:03 | — | — | — | — | — | — | — | 5:03 | — | — | — | — | — | — |
 | — | — | 6:28 | — | — | — | — | — | — | — | 6:27 | — | — | — | — | — | — | — | 6:24 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 28 | 27 | 26 | 26 | 25 | 25 | 26 | 27 | 28 | 27 | 26 | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 27 |
Feels °C | 30 | 29 | 29 | 29 | 30 | 29 | 28 | 29 | 29 | 29 | 29 | 28 | 30 | 29 | 29 | 29 | 30 | 28 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SSE 6 | SSW 8 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 10 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SE 11 | SSW 9 | SSW 9 | SSW 8 |
| kJ | 3 | 6 | 7 | 10 | 10 | 10 | 10 | 10 | 6 | 4 | 4 | 3 | 3 | 3 | 4 | 4 | 4 | 8 | 8 | 7 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SE 10 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SE 10 | SE 10 | SE 10 | SW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 6 | SSE 6 | SSE 6 | SSE 6 |
| kJ | 6 | 4 | 6 | 6 | 6 | 6 | 4 | 4 | 4 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 1 | 3 | 3 | 3 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SW 8 | SW 8 | SSW 8 | SW 8 | SW 8 | SW 8 | S 9 | SE 11 | SE 11 | SE 11 |
| kJ | 4 | 12 | 4 | 4 | 4 | 4 | 6 | 6 | 6 | 6 | 2 | 2 | 6 | 2 | 2 | 2 | 2 | 4 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | — | SSE 6 | SSE 2 | — | — | — | — | — | — | SSE 6 | SSE 3 | S 3 | — | — | — | — | SSE 6 | SSE 3 | SSE 3 | S 3 |
| kJ | — | 7 | 1 | — | — | — | — | — | — | 7 | 1 | 1 | — | — | — | — | 3 | 1 | 2 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 51 | 51 | 51 | 38 | 51 | 51 | 51 | 74 | 77 | 77 | 77 | 77 | 55 | 55 | 16 | 16 | 18 | 77 | 76 | 76 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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