Surf Forecasts:
How big are the waves at Rock Island today (25 Aug):
- Afternoon surf: Afternoon surf (25 Aug, local time) - 3.5ft (1.0m), 12s period with SSE swell.
- Evening surf: Evening surf (25 Aug, local time) - 4ft (1.2m), 12s period with S swell.
The current surf forecast for Rock Island at 8PM is: 1.2m 12s primary swell from a South direction and 0.1m 13s secondary swell from a East direction, 1.0m 5s secondary swell from a South-southwest direction (forecast issued at 02:00pm August 25). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (25 Aug) | - | - |
| Afternoon (25 Aug) | 3.5ft (1.0m) | 12s |
| Evening (25 Aug) | 4ft (1.2m) | 12s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 16mm), heaviest on Thu morning. Warm (max 30°C on Tue afternoon, min 24°C on Thu afternoon). Winds decreasing (fresh winds from the SSW on Tue afternoon, calm by Thu afternoon). | ||||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | ||||||||||||||||||
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 13 | SSE 12 | S 12 | S 12 | S 12 | S 12 | S 12 | SSW 12 | SSW 11 | SSW 12 | SSW 11 | SSW 11 | SSW 5 | SW 5 | SSW 10 | SW 10 | S 11 | S 11 | S 10 | S 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 484 | 298 | 403 | 403 | 407 | 362 | 280 | 183 | 167 | 137 | 130 | 95 | 53 | 51 | 39 | 28 | 58 | 55 | 49 | 47 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | cross | off | off | glassy | on | on |
High Tide | 4:45PM1.39m | 2:39AM1.41m | 5:10PM1.43m | 3:40AM1.47m | 5:33PM1.46m | |||||||||||||||
Low Tide | 9:11AM0.27m | 9:41PM1.08m | 10:00AM0.23m | 10:21PM0.97m | 10:42AM0.22m | |||||||||||||||
 | | |  |  | | | | | | | |  | |  |  | |  | |  | |
 | — | — | — | — | — | 5:07 | — | — | — | — | — | — | — | 5:09 | — | — | — | — | — | — |
 | — | — | 6:19 | — | — | — | — | — | — | — | 6:17 | — | — | — | — | — | — | — | 6:15 | — |
mm | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | 1 | 6 | 3 | 2 | 2 | 1 |
Temp °C | 29 | 30 | 29 | 28 | 27 | 28 | 27 | 28 | 29 | 30 | 30 | 28 | 28 | 28 | 28 | 25 | 25 | 24 | 24 | 24 |
Feels °C | 29 | 30 | 28 | 29 | 29 | 32 | 30 | 32 | 32 | 31 | 30 | 29 | 29 | 31 | 33 | 26 | 26 | 27 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | SSE 13 | SSE 12 | S 12 | S 12 | S 12 | S 12 | S 12 | SSW 12 | SSW 11 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SSW 5 | S 6 | S 6 | S 6 | S 6 | S 6 | S 10 |
| kJ | 484 | 298 | 403 | 403 | 407 | 362 | 280 | 183 | 167 | 137 | 130 | 95 | 47 | 42 | 23 | 15 | 16 | 16 | 17 | 47 |
Swell 2 Height (m) Direction Period (s) | S 16 | S 14 | E 13 | E 13 | E 13 | SE 10 | SSW 5 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | SSW 11 | SSW 10 | SSE 9 | S 11 | S 11 | S 10 | SSW 6 |
| kJ | 181 | 243 | 3 | 3 | 3 | 25 | 13 | 48 | 48 | 47 | 33 | 32 | 31 | 45 | 39 | 28 | 58 | 55 | 49 | 10 |
Swell 3 Height (m) Direction Period (s) | E 14 | E 13 | E 13 | ESE 13 | ESE 13 | E 13 | SE 10 | SSW 5 | E 12 | E 12 | E 11 | E 11 | S 10 | SSE 8 | SSE 9 | SW 10 | SW 10 | SSE 10 | SSE 10 | SE 10 |
| kJ | 4 | 3 | 31 | 34 | 33 | 3 | 25 | 9 | 3 | 3 | 3 | 2 | 19 | 28 | 32 | 25 | 26 | 18 | 18 | 23 |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | SSW 5 | SW 4 | SW 4 | S 5 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | SW 5 | SSW 5 | — | — | — | — | — |
| kJ | 15 | 43 | 50 | 33 | 29 | 22 | 24 | 15 | 11 | 29 | 55 | 62 | 53 | 51 | 32 | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 249 | 249 | 249 | 27 | 12 | 10 | 10 | 18 | 534 | 534 | 27 | 27 | 27 | 14 | 2 | 0 | 0 | 0 | 8 | 14 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Rock Island surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Nearest