Surf Forecasts:
How big are the waves at Rock Island today (10 Sep):
- Morning surf: Morning surf (10 Sep, local time) - 3.5ft (1.0m), 8s period with S swell.
- Afternoon surf: Afternoon surf (10 Sep, local time) - 2.5ft (0.8m), 8s period with S swell.
- Evening surf: Evening surf (10 Sep, local time) - 2ft (0.6m), 8s period with S swell.
The current surf forecast for Rock Island at 9AM is: 1.0m 8s primary swell from a South direction (forecast issued at 02:00am September 10). An open ocean swell of 0.6m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (10 Sep) | 3.5ft (1.0m) | 8s |
| Afternoon (10 Sep) | 2.5ft (0.8m) | 8s |
| Evening (10 Sep) | 2ft (0.6m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 20mm), heaviest during Fri afternoon. Warm (max 22°C on Sat afternoon, min 20°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||||||||||
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 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 306 | 220 | 181 | 143 | 90 | 86 | 65 | 48 | 45 | 44 | 30 | 28 | 28 | 28 | 29 | 19 | 19 | 19 | 19 | 19 | 11 | 11 | 10 | 10 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off |
High Tide | 3:13AM1.43m | 4:57PM1.44m | 4:08AM1.50m | 5:19PM1.47m | 4:56AM1.56m | 5:41PM1.48m | ||||||||||||||||||
Low Tide | 9:53PM0.96m | 10:09AM0.31m | 10:28PM0.82m | 10:49AM0.32m | 11:01PM0.69m | 11:24AM0.37m | ||||||||||||||||||
 |  |  |  | | | | |  | | | | | | | | | |  | | | | | | |
 | — | 5:20 | — | — | — | — | — | — | — | 5:20 | — | — | — | — | — | — | — | 5:20 | — | — | — | — | — | — |
 | — | — | — | — | — | 5:57 | — | — | — | — | — | — | — | 5:55 | — | — | — | — | — | — | — | 5:53 | — | — |
mm | 6 | 3 | — | 1 | 1 | — | 1 | 1 | — | — | 1 | 2 | 2 | 5 | 4 | 1 | — | — | 1 | — | — | — | — | — |
Temp °C | 21 | 21 | 20 | 20 | 20 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 22 | 21 |
Feels °C | 19 | 19 | 17 | 18 | 18 | 19 | 18 | 19 | 20 | 20 | 20 | 21 | 21 | 20 | 19 | 20 | 20 | 20 | 20 | 19 | 21 | 20 | 22 | 21 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 |
| kJ | 306 | 220 | 181 | 143 | 90 | 86 | 65 | 48 | 45 | 44 | 30 | 28 | 28 | 28 | 29 | 19 | 19 | 19 | 19 | 19 | 11 | 11 | 10 | 10 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | ESE 9 | ESE 9 | — | E 11 | ESE 9 | ESE 10 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 8 | SE 9 |
| kJ | 9 | 8 | 8 | — | 2 | 8 | 10 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 11 | SE 11 | E 15 | — | E 15 | E 8 | — | E 16 | E 15 | E 10 | S 9 | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | E 14 | E 14 | E 14 | SE 9 | E 13 |
| kJ | 5 | 5 | 5 | 4 | — | 17 | 5 | — | 5 | 4 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 4 | 4 | 4 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | NE 3 | NE 3 | NE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NE 3 | NNE 3 | NNE 3 | — | — | — | — | — | NNE 2 | NNE 2 | NNE 2 | NNE 3 | NNE 2 | NNE 2 | NNE 3 | NNE 3 | NNE 3 |
| kJ | 7 | 7 | 7 | 8 | 6 | 4 | 4 | 2 | 1 | 2 | — | — | — | — | — | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 8 | 145 | 145 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 51 | 51 | 16 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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