Surf Forecasts:
How big are the waves at Rock Island today (04 Sep):
- Morning surf: Morning surf (04 Sep, local time) - 2ft (0.6m), 10s period with S swell.
- Afternoon surf: Afternoon surf (04 Sep, local time) - 1.5ft (0.5m), 10s period with S swell.
- Evening surf: Evening surf (04 Sep, local time) - 2ft (0.6m), 9s period with SSW swell.
The current surf forecast for Rock Island at 8AM is: 0.6m 10s primary swell from a South direction and 0.3m 7s secondary swell from a Southeast direction (forecast issued at 02:00am September 04). The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (04 Sep) | 2ft (0.6m) | 10s |
| Afternoon (04 Sep) | 1.5ft (0.5m) | 10s |
| Evening (04 Sep) | 2ft (0.6m) | 9s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 81mm), heaviest during Sun night. Warm (max 27°C on Fri afternoon, min 19°C on Sun night). Winds increasing (light winds from the NE on Fri morning, near gales from the N by Sun night). | ||||||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | ||||||||||||||||||||||
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 11 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | SSW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SE 8 | SSE 8 | SSE 8 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 91 | 82 | 75 | 73 | 71 | 49 | 67 | 66 | 68 | 52 | 52 | 35 | 28 | 27 | 14 | 13 | 14 | 11 | 11 | 11 | 6 | 16 | 24 | 23 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | off | off | off | off | off | off | off | cross-off | off | cross-off | off | off | off | off | off | off | off | off | off | off | off | off |
High Tide | 10:36AM1.22m | 8:48PM1.44m | 12:35PM1.19m | 9:29PM1.40m | 2:50PM1.24m | |||||||||||||||||||
Low Tide | 3:32AM0.40m | 2:58PM1.03m | 4:36AM0.42m | 3:39PM1.14m | 5:57AM0.42m | 5:39PM1.22m | ||||||||||||||||||
 | |  | | | |  | |  |  |  |  | | | | | | | | | | | |  | |
 | — | 5:15 | — | — | — | — | — | — | — | 5:16 | — | — | — | — | — | — | — | 5:16 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:05 | — | — | — | — | — | — | — | 6:04 | — | — | — | — | — | — | — | 6:02 | — |
mm | — | — | — | — | — | — | 1 | — | 3 | 8 | 9 | 5 | 3 | 1 | — | — | — | 1 | 1 | 1 | 2 | 3 | 3 | 16 |
Temp °C | 26 | 26 | 26 | 25 | 26 | 27 | 26 | 24 | 23 | 22 | 21 | 21 | 20 | 21 | 21 | 22 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 19 |
Feels °C | 28 | 29 | 29 | 25 | 27 | 28 | 27 | 24 | 23 | 21 | 20 | 19 | 17 | 18 | 19 | 19 | 17 | 17 | 16 | 17 | 16 | 13 | 13 | 12 |
Swell 1 Height (m) Direction Period (s) | S 11 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | SSW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SE 8 | SE 8 | SSE 8 | SE 8 | SSE 8 | SSE 8 |
| kJ | 91 | 82 | 75 | 73 | 71 | 49 | 67 | 66 | 68 | 52 | 52 | 35 | 28 | 27 | 14 | 13 | 14 | 7 | 11 | 11 | 6 | 16 | 24 | 23 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SSE 6 | SE 7 | SE 6 | SE 6 | SE 6 | SE 6 | SSE 6 | SE 9 | SE 9 | SE 9 | ESE 7 | ESE 7 | ESE 7 | SE 7 | SE 8 | SE 8 | SSW 8 | SSW 8 | S 8 | S 9 | SE 11 | S 10 |
| kJ | 4 | 4 | 4 | 7 | 7 | 10 | 7 | 6 | 4 | 12 | 12 | 12 | 4 | 4 | 4 | 2 | 11 | 11 | 7 | 7 | 1 | 1 | 5 | 16 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | E 9 | E 9 | SE 9 | SE 8 | SE 8 | SW 10 | SW 9 | SW 10 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | S 10 | ESE 11 |
| kJ | 15 | 14 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 6 | 6 | 12 | 3 | 3 | 4 | 3 | 4 | 4 | 3 | 3 | 3 | 3 | 2 | 11 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NNE 2 | NNE 2 | NE 2 | NE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NE 4 | NNE 4 |
| kJ | — | — | — | — | — | — | — | — | 1 | 1 | 1 | 2 | 5 | 5 | 5 | 5 | 8 | 10 | 14 | 20 | 24 | 23 | 39 | 67 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 14 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 38 | 0 | 38 | 552 | 552 | 509 | 487 | 470 | 487 | 487 | 552 | 565 | 488 | 552 | 487 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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