Surf Forecasts:
How big are the waves at Rock Island today (03 Sep):
- Morning surf: Morning surf (03 Sep, local time) - 1.5ft (0.5m), 9s period with S swell.
- Afternoon surf: Afternoon surf (03 Sep, local time) - 3ft (0.9m), 4s period with SSW swell.
- Evening surf: Evening surf (03 Sep, local time) - 1.5ft (0.4m), 8s period with SSW swell.
The current surf forecast for Rock Island at 6AM is: 0.5m 9s primary swell from a South direction and 0.1m 10s secondary swell from a Southeast direction (forecast issued at 02:00am September 03). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (03 Sep) | 1.5ft (0.5m) | 9s |
| Afternoon (03 Sep) | 3ft (0.9m) | 4s |
| Evening (03 Sep) | 1.5ft (0.4m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 75mm), heaviest during Fri night. Warm (max 30°C on Thu afternoon, min 20°C on Fri night). Winds increasing (calm on Thu night, strong winds from the NNE by Sat night). | ||||||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||||||||||
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 9 | S 9 | S 9 | S 9 | S 9 | SSW 4 | SSW 8 | SSW 8 | 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 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 37 | 40 | 39 | 39 | 74 | 24 | 24 | 24 | 64 | 57 | 53 | 73 | 71 | 70 | 67 | 66 | 49 | 52 | 52 | 29 | 28 | 16 | 13 | 14 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | off | cross-off | cross-on | on | glassy | cross-off | off | off | off | off | off | off | cross-off | off | off | off | off | off |
High Tide | 9:19AM1.31m | 8:17PM1.47m | 10:36AM1.22m | 8:48PM1.44m | 12:35PM1.19m | |||||||||||||||||||
Low Tide | 2:40AM0.39m | 2:27PM0.91m | 3:32AM0.40m | 2:58PM1.03m | 4:36AM0.42m | 3:39PM1.14m | ||||||||||||||||||
 |  |  | | | |  |  | | | | |  | | | |  |  |  | | | | | | |
 | — | 5:13 | — | — | — | — | — | — | — | 5:15 | — | — | — | — | — | — | — | 5:16 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:07 | — | — | — | — | — | — | — | 6:05 | — | — | — | — | — | — | — | 6:04 | — |
mm | — | — | — | — | — | — | 1 | 1 | 1 | — | — | — | 1 | — | 2 | 4 | 10 | 24 | 19 | 3 | 1 | 1 | 1 | 2 |
Temp °C | 27 | 27 | 27 | 27 | 28 | 30 | 25 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 23 | 22 | 22 | 21 | 20 | 20 | 22 | 22 | 22 | 22 |
Feels °C | 30 | 31 | 30 | 29 | 28 | 31 | 22 | 25 | 27 | 28 | 29 | 28 | 28 | 27 | 25 | 24 | 23 | 20 | 18 | 17 | 20 | 19 | 18 | 18 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 9 | S 9 | SE 10 | SE 10 | SSW 4 | S 4 | 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 |
| kJ | 37 | 40 | 39 | 39 | 4 | 4 | 14 | 6 | 64 | 57 | 53 | 73 | 71 | 70 | 67 | 66 | 49 | 52 | 52 | 29 | 28 | 16 | 13 | 14 |
Swell 2 Height (m) Direction Period (s) | SSW 10 | SE 10 | SE 10 | SE 10 | E 10 | S 13 | SSW 8 | SSW 8 | SSE 5 | SSE 5 | SSE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SSE 6 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | ESE 7 | SE 7 |
| kJ | 10 | 4 | 4 | 4 | 2 | 3 | 24 | 24 | 5 | 5 | 10 | 9 | 6 | 6 | 7 | 6 | 4 | 12 | 19 | 11 | 11 | 11 | 4 | 7 |
Swell 3 Height (m) Direction Period (s) | SE 11 | E 10 | E 10 | E 10 | — | E 10 | SSW 13 | SSW 12 | NNE 3 | SE 10 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | E 9 | E 9 | E 9 | E 9 | SE 8 | SE 8 | SE 8 |
| kJ | 4 | 2 | 2 | 2 | — | 2 | 16 | 14 | 1 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 6 | 6 | 6 | 6 | 11 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | S 9 | SSW 4 | — | NNE 3 | ENE 3 | — | — | — | — | — | — | — | — | — | ENE 2 | — | NE 3 | ENE 3 | ENE 3 | ENE 3 |
| kJ | — | — | — | — | 74 | 24 | — | 3 | 4 | — | — | — | — | — | — | — | — | — | 1 | — | 2 | 6 | 6 | 7 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 76 | 77 | 76 | 76 | 90 | 228 | 76 | 38 | 14 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 38 | 38 | 228 | 228 | 552 | 228 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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