Surf Forecasts:
How big are the waves at Rock Island today (13 Sep):
- Morning surf: Morning surf (13 Sep, local time) - 0.5ft (0.2m), 7s period with SSW swell.
- Afternoon surf: Afternoon surf (13 Sep, local time) - 1ft (0.3m), 9s period with SE swell.
- Evening surf: Evening surf (13 Sep, local time) - 1.5ft (0.4m), 8s period with SE swell.
The current surf forecast for Rock Island at 8AM is: 0.2m 7s primary swell from a South-southwest direction and 0.1m 7s secondary swell from a Southeast direction (forecast issued at 02:00am September 13). The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Sep) | 0.5ft (0.2m) | 7s |
| Afternoon (13 Sep) | 1ft (0.3m) | 9s |
| Evening (13 Sep) | 1.5ft (0.4m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 10mm), heaviest on Tue morning. Warm (max 27°C on Mon afternoon, min 21°C on Sun morning). Winds decreasing (fresh winds from the SSW on Mon afternoon, calm by Tue night). | ||||||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||||||||||
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) | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 7 | SE 7 | SSE 7 | S 4 | S 4 | SSW 4 | SE 10 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 7 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 9 | 9 | 5 | 5 | 12 | 12 | 18 | 17 | 15 | 14 | 12 | 4 | 13 | 28 | 32 | 24 | 21 | 20 | 26 | 24 | 22 | 16 | 16 | 20 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | cross-off | cross-on | on | on | on | on | on | on | on | on | on | on | cross-on | on | cross-on | on | on | on | cross-on | glassy |
High Tide | 5:41AM1.58m | 6:03PM1.50m | 6:24AM1.58m | 6:25PM1.51m | 7:08AM1.53m | 6:48PM1.52m | ||||||||||||||||||
Low Tide | 11:34PM0.56m | 11:58AM0.45m | 00:08AM0.45m | 12:29PM0.55m | 00:43AM0.37m | 12:59PM0.67m | ||||||||||||||||||
 |  |  |  |  | |  |  | | | | | |  | | | |  | | |  | | | | |
 | — | 5:22 | — | — | — | — | — | — | — | 5:22 | — | — | — | — | — | — | — | 5:22 | — | — | — | — | — | — |
 | — | — | — | — | — | 5:52 | — | — | — | — | — | — | — | 5:51 | — | — | — | — | — | — | — | 5:50 | — | — |
mm | 1 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 5 | 1 | — | — | — |
Temp °C | 20 | 21 | 20 | 21 | 23 | 24 | 24 | 24 | 25 | 25 | 25 | 26 | 26 | 27 | 27 | 26 | 24 | 24 | 23 | 23 | 24 | 25 | 26 | 26 |
Feels °C | 20 | 22 | 21 | 22 | 26 | 27 | 26 | 26 | 27 | 27 | 27 | 26 | 25 | 25 | 26 | 25 | 23 | 24 | 23 | 24 | 25 | 27 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 7 | SE 7 | SSE 7 | SE 9 | SE 10 | SE 10 | SE 10 | S 5 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 7 |
| kJ | 9 | 9 | 5 | 5 | 12 | 12 | 18 | 17 | 15 | 14 | 12 | 4 | 13 | 15 | 15 | 23 | 11 | 20 | 26 | 24 | 22 | 15 | 15 | 20 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SE 9 | SE 7 | SE 7 | SSW 7 | E 13 | E 13 | SW 7 | SW 7 | SW 7 | S 7 | SE 8 | E 11 | E 12 | E 12 | E 12 | SE 9 | S 7 | E 13 | S 7 | E 13 | E 14 | E 14 | E 14 |
| kJ | 3 | 3 | 2 | 2 | 5 | 3 | 3 | 2 | 2 | 2 | 1 | 3 | 3 | 11 | 12 | 11 | 21 | 1 | 13 | 1 | 14 | 4 | 16 | 16 |
Swell 3 Height (m) Direction Period (s) | E 13 | SE 7 | SE 9 | SE 9 | E 12 | SSW 7 | SSW 7 | E 13 | E 12 | E 12 | E 12 | E 12 | E 16 | E 15 | E 15 | E 15 | S 7 | S 7 | E 16 | S 7 | S 7 | E 14 | E 12 | E 12 |
| kJ | 4 | 2 | 3 | 3 | 3 | 5 | 5 | 3 | 3 | 3 | 3 | 3 | 5 | 4 | 4 | 4 | 1 | 1 | 5 | 1 | 1 | 16 | 11 | 11 |
Wind waves Height (m) Direction Period (s) | NNE 2 | NNE 2 | — | — | — | — | S 7 | S 3 | SSW 3 | SSW 2 | SSW 2 | SSW 2 | S 4 | S 4 | SSW 4 | SSW 4 | SW 4 | SSW 4 | SSW 4 | SSW 4 | S 3 | S 4 | S 4 | SSW 4 |
| kJ | 1 | 1 | — | — | — | — | 8 | 1 | 1 | 1 | 1 | 1 | 12 | 28 | 32 | 24 | 15 | 15 | 8 | 6 | 5 | 12 | 10 | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 38 | 38 | 51 | 38 | 16 | 64 | 76 | 76 | 76 | 76 | 76 | 92 | 142 | 518 | 77 | 90 | 38 | 38 | 38 | 77 | 77 | 76 | 38 | 0 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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