Surf Forecasts:
How big are the waves at Rock Island today (16 Sep):
- Morning surf: Morning surf (16 Sep, local time) - 1.5ft (0.4m), 7s period with SE swell.
- Afternoon surf: Afternoon surf (16 Sep, local time) - 1.5ft (0.4m), 8s period with SE swell.
- Evening surf: Evening surf (16 Sep, local time) - 1.5ft (0.4m), 8s period with SE swell.
The current surf forecast for Rock Island at 3PM is: 0.4m 8s primary swell from a Southeast direction and 0.2m 6s secondary swell from a South-southwest direction (forecast issued at 08:00am September 16). An open ocean swell of 0.3m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Sep) | 1.5ft (0.4m) | 7s |
| Afternoon (16 Sep) | 1.5ft (0.4m) | 8s |
| Evening (16 Sep) | 1.5ft (0.4m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 41mm), heaviest during Wed morning. Warm (max 22°C on Thu afternoon, min 19°C on Thu morning). Winds increasing (light winds from the NNE on Wed morning, strong winds from the N by Fri morning). | ||||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||||||||
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) | SSE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 7 | SSE 8 | SSE 8 | SSE 9 | SSE 9 | SE 8 | SE 7 | E 10 | S 13 | S 12 | SE 12 | SE 18 | SE 16 | SE 15 |
Wave Graph  | ||||||||||||||||||||||
 kJ | 18 | 12 | 13 | 17 | 17 | 17 | 17 | 17 | 8 | 7 | 6 | 7 | 8 | 9 | 9 | 3 | 3 | 6 | 6 | 50 | 69 | 221 |
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 |
High Tide | 7:55AM1.46m | 7:12PM1.51m | 8:47AM1.38m | 7:38PM1.50m | 9:52AM1.29m | 8:06PM1.47m | ||||||||||||||||
Low Tide | 1:28PM0.80m | 2:02AM0.31m | 1:57PM0.92m | 2:48AM0.33m | 2:28PM1.03m | |||||||||||||||||
 |  | | |  | |  | |  |  | |  |  | |  |  | | | | | | | |
 | 5:24 | — | — | — | — | — | — | 5:24 | — | — | — | — | — | — | — | 5:24 | — | — | — | — | — | — |
 | — | — | — | 5:47 | — | — | — | — | — | — | — | 5:46 | — | — | — | — | — | — | — | 5:45 | — | — |
mm | 5 | 8 | 9 | 8 | 7 | 6 | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 19 | 21 | 22 | 21 | 20 | 20 | 19 | 19 | 20 | 20 | 20 | 19 | 20 |
Feels °C | 20 | 21 | 22 | 20 | 18 | 17 | 18 | 17 | 17 | 16 | 17 | 17 | 15 | 14 | 15 | 13 | 12 | 13 | 14 | 14 | 13 | 15 |
Swell 1 Height (m) Direction Period (s) | SSE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 7 | SSE 8 | SSE 8 | SSE 9 | SSE 9 | SSE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 12 | SE 16 | SE 15 |
| kJ | 18 | 12 | 13 | 17 | 17 | 17 | 17 | 17 | 8 | 7 | 6 | 7 | 8 | 7 | 3 | 3 | 3 | 3 | 3 | 5 | 69 | 221 |
Swell 2 Height (m) Direction Period (s) | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | S 5 | S 5 | S 5 | SE 8 | SE 7 | SE 8 | SE 7 | SE 8 | SE 8 | ESE 5 | E 10 | E 10 | S 12 | SE 12 | SE 18 | SSE 11 | E 10 |
| kJ | 12 | 7 | 6 | 3 | 3 | 2 | 1 | 1 | 3 | 2 | 2 | 2 | 2 | 9 | 3 | 2 | 2 | 3 | 6 | 13 | 13 | 2 |
Swell 3 Height (m) Direction Period (s) | S 9 | SE 9 | SE 9 | SSW 6 | E 13 | E 12 | E 12 | S 5 | S 8 | — | E 12 | — | E 13 | SE 9 | SE 7 | SE 7 | S 13 | SE 12 | — | SE 18 | E 11 | — |
| kJ | 2 | 3 | 3 | 3 | 13 | 11 | 3 | 1 | 1 | — | 3 | — | 3 | 3 | 9 | 2 | 3 | 6 | — | 50 | 9 | — |
Wind waves Height (m) Direction Period (s) | NNE 2 | NNE 3 | NE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NE 3 | ENE 3 | ENE 4 | NE 4 | NE 4 | NNE 4 | NNE 4 | N 4 | NNE 4 | NNE 4 | NNE 4 | N 4 |
| kJ | 1 | 1 | 1 | 1 | 3 | 3 | 4 | 5 | 5 | 7 | 5 | 8 | 12 | 17 | 14 | 18 | 24 | 33 | 28 | 28 | 28 | 27 |
Nearest Offshore or Glassy | ||||||||||||||||||||||
Distance (km) | 38 | 51 | 51 | 51 | 51 | 145 | 145 | 145 | 145 | 145 | 145 | 145 | 145 | 470 | 470 | 470 | 470 | 487 | 228 | 228 | 470 | 470 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||
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