Surf Forecasts:
How big are the waves at Rock Island today (20 Jul):
- Morning surf: Morning surf (20 Jul, local time) - 0.5ft (0.2m), 9s period with SSE swell.
- Afternoon surf: Afternoon surf (20 Jul, local time) - 0.5ft (0.2m), 8s period with SSE swell.
- Evening surf: Evening surf (20 Jul, local time) - 1.5ft (0.5m), 4s period with SSW swell.
The current surf forecast for Rock Island at 5AM is: 0.2m 8s primary swell from a South-southeast direction and 0.2m 3s secondary swell from a South-southwest direction, 0.3m 4s secondary swell from a South direction (forecast issued at 02:00am July 20). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Jul) | 0.5ft (0.2m) | 9s |
| Afternoon (20 Jul) | 0.5ft (0.2m) | 8s |
| Evening (20 Jul) | 1.5ft (0.5m) | 4s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 2mm), mostly falling on Wed night. Warm (max 29°C on Tue morning, min 27°C on Mon night). Wind will be generally light. | ||||||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 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) | S 4 | SSE 8 | SSE 9 | SSE 9 | SSE 9 | SSE 8 | S 4 | SSW 4 | SSW 4 | SW 4 | SW 4 | SSE 8 | SSE 8 | ESE 11 | S 4 | E 11 | SSW 4 | SW 4 | SW 4 | SSW 4 | SSW 4 | SSW 3 | SSW 3 | SSW 4 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 5 | 6 | 8 | 7 | 7 | 7 | 7 | 8 | 9 | 15 | 9 | 6 | 6 | 12 | 7 | 9 | 10 | 17 | 9 | 4 | 3 | 5 | 5 | 5 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | on | on | on | on | glassy | on | cross-on | on | on | on | on | glassy | off | glassy | on | on | on | on |
High Tide | 8:05AM1.36m | 9:04PM1.41m | 9:03AM1.27m | 9:33PM1.40m | 10:14AM1.18m | |||||||||||||||||||
Low Tide | 2:24AM0.71m | 2:31PM0.43m | 3:12AM0.65m | 3:07PM0.59m | 4:07AM0.58m | 3:45PM0.75m | ||||||||||||||||||
 | |  | | | | | | | | | |  | | | | | | | | | | | | |
 | — | 4:41 | — | — | — | — | — | — | — | 4:41 | — | — | — | — | — | — | — | 4:41 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:53 | — | — | — | — | — | — | — | 6:53 | — | — | — | — | — | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 28 |
Feels °C | 30 | 30 | 31 | 32 | 30 | 30 | 31 | 31 | 30 | 31 | 32 | 34 | 32 | 32 | 31 | 32 | 33 | 33 | 33 | 34 | 32 | 32 | 31 | 32 |
Swell 1 Height (m) Direction Period (s) | S 4 | SSE 8 | SSE 9 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSW 4 | SW 4 | SSW 4 | SSE 8 | SSE 8 | SE 8 | SSE 8 | SE 8 | SSW 4 | SSW 4 | SSW 4 | SE 8 | SE 8 | SE 11 | SE 11 |
| kJ | 4 | 6 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 4 | 3 | 6 | 6 | 2 | 6 | 2 | 7 | 6 | 3 | 2 | 2 | 5 | 5 |
Swell 2 Height (m) Direction Period (s) | SSE 7 | S 8 | SSW 3 | SSW 3 | S 7 | S 7 | S 7 | S 7 | S 7 | SSE 8 | SSE 8 | SSE 8 | E 11 | SE 11 | E 11 | SE 11 | SE 11 | SE 8 | SE 8 | SE 8 | S 11 | SE 11 | S 7 | SE 7 |
| kJ | 5 | 5 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | 7 | 6 | 2 | 5 | 2 | 5 | 4 | 2 | 2 | 2 | 2 | 5 | 1 | 2 |
Swell 3 Height (m) Direction Period (s) | S 8 | S 9 | S 8 | S 7 | SE 11 | SE 11 | SE 11 | SE 11 | E 11 | S 7 | SE 11 | E 11 | S 7 | ESE 11 | S 7 | E 11 | — | SE 11 | E 11 | SE 11 | E 10 | SE 11 | SE 7 | S 6 |
| kJ | 5 | 2 | 4 | 4 | 5 | 5 | 5 | 5 | 2 | 1 | 5 | 2 | 1 | 12 | 1 | 9 | — | 5 | 2 | 4 | 2 | 4 | 2 | 1 |
Wind waves Height (m) Direction Period (s) | SW 3 | S 4 | SW 3 | SW 3 | S 3 | SSW 3 | S 4 | SSW 4 | SSW 4 | SW 4 | SW 4 | SW 4 | SSW 4 | S 3 | S 4 | SSW 4 | SSW 4 | SW 4 | SW 4 | — | SSW 4 | SSW 3 | SSW 3 | SSW 4 |
| kJ | 2 | 2 | 1 | 1 | 1 | 3 | 6 | 8 | 9 | 15 | 9 | 5 | 3 | 5 | 7 | 9 | 10 | 17 | 9 | — | 3 | 3 | 3 | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 76 | 76 | 76 | 76 | 77 | 77 | 92 | 76 | 76 | 76 | 76 | 76 | 76 | 77 | 92 | 76 | 76 | 76 | 55 | 76 | 76 | 77 | 77 | 76 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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