Surf Forecasts:
How big are the waves at Rock Island today (12 Jul):
- Morning surf: Morning surf (12 Jul, local time) - 5.5ft (1.7m), 16s period with SSW swell.
- Afternoon surf: Afternoon surf (12 Jul, local time) - 5ft (1.5m), 16s period with SSW swell.
- Evening surf: Evening surf (12 Jul, local time) - 4.5ft (1.3m), 15s period with SSW swell.
The current surf forecast for Rock Island at 2PM is: 1.6m 16s primary swell from a South-southwest direction and 0.4m 10s secondary swell from a Southeast direction (forecast issued at 08:00am July 12). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Jul) | 5.5ft (1.7m) | 16s |
| Afternoon (12 Jul) | 5ft (1.5m) | 16s |
| Evening (12 Jul) | 4.5ft (1.3m) | 15s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastSome drizzle, heaviest during Sun night. Warm (max 28°C on Mon morning, min 25°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wed 15 | |||||||||||||||||||||
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 | 12 AM | 3 AM | |
Swell Height Map |  |  |  |  |  |  |  |  |  | |||||||||||||||
Wave Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 1512 | 1341 | 1324 | 1107 | 837 | 656 | 487 | 379 | 384 | 302 | 258 | 206 | 158 | 145 | 109 | 95 | 93 | 91 | 64 | 59 | 39 | 39 | 38 | 38 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | cross-on | on | glassy | off | glassy | cross-on | on | on | on | glassy | cross-off | glassy | glassy | on | on | on | on | on | on | on |
High Tide | 4:55PM1.32m | 2:17AM1.43m | 5:37PM1.38m | 3:10AM1.46m | 6:12PM1.43m | |||||||||||||||||||
Low Tide | 9:13AM0.17m | 9:17PM1.11m | 10:01AM0.08m | 10:13PM1.10m | 10:45AM0.02m | 10:59PM1.06m | ||||||||||||||||||
 |  | | | |  |  | | | | | | | | |  | | | |  | | | | | |
 | 4:35 | — | — | — | — | — | — | 4:35 | — | — | — | — | — | — | — | 4:37 | — | — | — | — | — | — | — | 4:37 |
 | — | — | — | — | 6:58 | — | — | — | — | — | — | — | 6:58 | — | — | — | — | — | — | — | 6:57 | — | — | 6:57 |
mm | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 27 | 26 | 28 | 28 | 28 | 28 | 25 | 25 | 25 | 26 | 27 | 27 | 27 | 26 | 26 | 26 |
Feels °C | 26 | 27 | 27 | 27 | 27 | 28 | 31 | 30 | 32 | 29 | 30 | 30 | 30 | 32 | 28 | 29 | 29 | 29 | 29 | 28 | 28 | 27 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 |
| kJ | 1512 | 1341 | 1324 | 1107 | 837 | 656 | 487 | 379 | 384 | 302 | 258 | 206 | 158 | 145 | 109 | 95 | 93 | 91 | 64 | 59 | 39 | 39 | 38 | 38 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SE 13 | SSE 10 | S 4 | S 5 | SE 10 | SE 10 | SSE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 12 | SE 12 | SE 12 | SE 10 | SE 10 | SE 10 |
| kJ | 24 | 35 | 32 | 32 | 7 | 9 | 10 | 12 | 4 | 4 | 9 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 6 | 6 | 5 | 4 | 4 | 4 |
Swell 3 Height (m) Direction Period (s) | — | SE 14 | SE 14 | SE 13 | — | ESE 13 | SSE 10 | SE 10 | SE 13 | SE 13 | ESE 13 | ESE 12 | SE 12 | SE 12 | SE 12 | SE 12 | SE 12 | SE 12 | SE 9 | S 15 | — | S 15 | S 14 | S 14 |
| kJ | — | 7 | 7 | 7 | — | 17 | 9 | 4 | 7 | 7 | 16 | 15 | 6 | 6 | 6 | 6 | 6 | 6 | 3 | 4 | — | 4 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | S 4 | S 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | S 2 | S 3 | S 3 | SSW 3 | SSW 3 |
| kJ | — | — | — | — | 12 | 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 5 | 6 | 4 | 4 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 12 | 14 | 142 | 77 | 76 | 12 | 0 | 0 | 0 | 14 | 14 | 14 | 14 | 0 | 0 | 0 | 0 | 18 | 18 | 76 | 77 | 38 | 76 | 76 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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