Surf Forecasts:
How big are the waves at Rock Island today (15 Sep):
- Morning surf: Morning surf (15 Sep, local time) - 1.5ft (0.4m), 8s period with SE swell.
- Afternoon surf: Afternoon surf (15 Sep, local time) - 3.5ft (1.0m), 5s period with S swell.
- Evening surf: Evening surf (15 Sep, local time) - 1.5ft (0.5m), 6s period with SE swell.
The current surf forecast for Rock Island at 8AM is: 0.4m 8s primary swell from a Southeast direction and 0.6m 5s secondary swell from a South direction (forecast issued at 08:00pm September 14). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Sep) | 1.5ft (0.4m) | 8s |
| Afternoon (15 Sep) | 3.5ft (1.0m) | 5s |
| Evening (15 Sep) | 1.5ft (0.5m) | 6s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 58mm), heaviest during Wed night. Warm (max 26°C on Mon night, min 19°C on Wed night). Winds increasing (light winds from the N on Tue afternoon, strong winds from the N by Wed night). | ||||||||||||||||||
Mon 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||||
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 | SE 10 | E 14 | S 5 | S 5 | SE 8 | SE 8 | S 5 | S 5 | S 6 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 |
Wave Graph  | ||||||||||||||||||
 kJ | 33 | 25 | 33 | 34 | 21 | 17 | 17 | 52 | 37 | 21 | 22 | 16 | 12 | 12 | 11 | 17 | 17 | 17 |
Wind (km/h) | ||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | on | on | cross-off | off | off | off | off | off | off | off | off | off |
High Tide | 6:25PM1.51m | 7:08AM1.53m | 6:48PM1.52m | 7:55AM1.46m | 7:12PM1.51m | |||||||||||||
Low Tide | 00:43AM0.37m | 12:59PM0.67m | 1:21AM0.32m | 1:28PM0.80m | ||||||||||||||
 | | | |  |  | | |  | |  | |  | | | | |  | |
 | — | — | — | 5:22 | — | — | — | — | — | — | — | 5:24 | — | — | — | — | — | — |
 | — | — | — | — | — | — | — | 5:50 | — | — | — | — | — | — | — | 5:47 | — | — |
mm | — | — | — | — | — | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | 9 |
Temp °C | 27 | 26 | 26 | 25 | 24 | 24 | 24 | 24 | 24 | 23 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 20 |
Feels °C | 26 | 25 | 26 | 25 | 24 | 25 | 25 | 27 | 27 | 23 | 21 | 22 | 20 | 20 | 20 | 20 | 21 | 17 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | — | S 5 | S 6 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 |
| kJ | 15 | 23 | 22 | 20 | 12 | 17 | 16 | — | 37 | 17 | 22 | 16 | 12 | 12 | 11 | 17 | 17 | 17 |
Swell 2 Height (m) Direction Period (s) | E 12 | E 12 | E 14 | E 13 | — | E 13 | E 13 | E 14 | E 14 | SE 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | S 6 |
| kJ | 12 | 11 | 33 | 14 | — | 13 | 14 | 16 | 16 | 21 | 11 | 12 | 11 | 6 | 6 | 3 | 3 | 2 |
Swell 3 Height (m) Direction Period (s) | E 15 | E 15 | — | S 7 | S 7 | S 7 | — | E 12 | E 12 | E 14 | E 13 | S 9 | S 9 | S 9 | SE 9 | SSW 6 | E 13 | E 12 |
| kJ | 4 | 4 | — | 1 | 1 | 1 | — | 11 | 11 | 16 | 13 | 2 | 2 | 2 | 3 | 6 | 13 | 11 |
Wind waves Height (m) Direction Period (s) | S 4 | SSW 4 | SSW 4 | S 5 | S 5 | S 5 | S 4 | S 5 | SSW 5 | — | NNE 2 | NNE 2 | NNE 2 | NNE 3 | NE 3 | NE 3 | NE 2 | NE 2 |
| kJ | 33 | 25 | 22 | 34 | 21 | 10 | 17 | 52 | 19 | — | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||
Distance (km) | 92 | 92 | 27 | 38 | 38 | 38 | 145 | 14 | 0 | 0 | 38 | 38 | 55 | 51 | 51 | 55 | 51 | 51 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||
Header Global | ||||||||||||||||||
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