Surf Forecasts:
How big are the waves at Rock Island today (18 Jul):
- Morning surf: Morning surf (18 Jul, local time) - 1ft (0.3m), 9s period with SE swell.
- Afternoon surf: Afternoon surf (18 Jul, local time) - 1ft (0.3m), 8s period with SE swell.
- Evening surf: Evening surf (18 Jul, local time) - 1ft (0.3m), 8s period with SE swell.
The current surf forecast for Rock Island at 1AM is: 0.2m 9s primary swell from a South-southeast direction and 0.2m 8s secondary swell from a South-southwest direction, 0.4m 4s secondary swell from a South-southeast direction (forecast issued at 08:00pm July 17). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Jul) | 1ft (0.3m) | 9s |
| Afternoon (18 Jul) | 1ft (0.3m) | 8s |
| Evening (18 Jul) | 1ft (0.3m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastSome drizzle, heaviest during Fri night. Warm (max 29°C on Mon afternoon, min 25°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Fri 17 | Saturday 18 | Sunday 19 | ||||||||||||||||
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) | S 4 | SSW 8 | SSE 9 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | S 4 | S 4 | S 4 |
Wave Graph  | ||||||||||||||||||
 kJ | 7 | 6 | 8 | 12 | 12 | 12 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 12 | 19 | 15 |
Wind (km/h) | ||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | on |
High Tide | 7:41PM1.45m | 6:25AM1.48m | 8:09PM1.43m | 7:14AM1.43m | 8:36PM1.42m | |||||||||||||
Low Tide | 00:59AM0.86m | 1:20PM0.16m | 1:40AM0.79m | 1:55PM0.29m | ||||||||||||||
 |  |  | |  | | | | | | | | | | | | |  | |
 | — | — | — | 4:39 | — | — | — | — | — | — | — | 4:39 | — | — | — | — | — | — |
 | 6:55 | — | — | — | — | — | — | — | 6:54 | — | — | — | — | — | — | — | 6:54 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 25 | 25 | 25 | 26 | 27 | 27 | 26 | 26 | 25 | 25 | 25 | 26 | 27 | 27 | 27 | 27 |
Feels °C | 29 | 28 | 27 | 27 | 28 | 29 | 29 | 28 | 27 | 28 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 8 | SE 9 | SSE 9 | SSE 4 | SSE 4 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 7 | SSE 7 | SSE 7 |
| kJ | 6 | 3 | 8 | 6 | 3 | 12 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 5 | 5 | 5 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SSW 8 | SSW 8 | SE 9 | SE 9 | S 7 | SW 8 | S 9 | S 9 | S 8 | S 8 | S 8 | S 9 | S 8 | S 8 | SE 12 | E 12 | S 8 |
| kJ | 3 | 6 | 6 | 12 | 12 | 1 | 2 | 2 | 1 | 5 | 1 | 1 | 6 | 5 | 5 | 6 | 3 | 5 |
Swell 3 Height (m) Direction Period (s) | E 8 | E 8 | E 10 | SW 8 | SW 8 | SW 8 | S 9 | S 8 | S 8 | SE 13 | S 8 | S 7 | E 12 | E 12 | E 12 | — | S 12 | S 10 |
| kJ | 1 | 1 | 2 | 2 | 2 | 3 | 2 | 1 | 1 | 6 | 1 | 1 | 3 | 3 | 3 | — | 3 | 2 |
Wind waves Height (m) Direction Period (s) | S 4 | SSE 4 | SSE 4 | SSE 4 | — | SSE 4 | S 4 | S 4 | SSE 3 | SSE 3 | SSE 3 | S 3 | S 4 | S 4 | S 3 | S 4 | S 4 | S 4 |
| kJ | 7 | 5 | 5 | 12 | — | 4 | 3 | 6 | 3 | 3 | 3 | 3 | 2 | 3 | 4 | 12 | 19 | 15 |
Nearest Offshore or Glassy | ||||||||||||||||||
Distance (km) | 145 | 77 | 77 | 77 | 51 | 64 | 64 | 64 | 64 | 77 | 64 | 76 | 76 | 76 | 77 | 77 | 77 | 76 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||
Header Global | ||||||||||||||||||
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