Surf Forecasts:
How big are the waves at Rock Island today (17 Sep):
- Afternoon surf: Afternoon surf (17 Sep, local time) - 0.5ft (0.2m), 9s period with SSE swell.
- Evening surf: Evening surf (17 Sep, local time) - 1ft (0.3m), 8s period with SE swell.
The current surf forecast for Rock Island at 9PM is: 0.3m 8s primary swell from a Southeast direction and 0.2m 8s secondary swell from a South-southeast direction (forecast issued at 02:00pm September 17). An open ocean swell of 0.8m 4s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Sep) | - | - |
| Afternoon (17 Sep) | 0.5ft (0.2m) | 9s |
| Evening (17 Sep) | 1ft (0.3m) | 8s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 54mm), heaviest during Sun morning. Warm (max 23°C on Thu afternoon, min 19°C on Thu night). Winds increasing (fresh winds from the N on Sat afternoon, near gales from the N by Sun morning). | ||||||||||||||||||||
Thu 17 | Friday 18 | Saturday 19 | ||||||||||||||||||
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 8 | SSE 9 | SE 9 | SE 8 | SE 7 | SE 7 | SSE 9 | S 12 | SSE 12 | SSE 11 | SSE 12 | SE 14 | SE 14 | SE 14 | SE 16 | SE 15 | SE 14 | SE 14 | SE 13 | SE 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 6 | 8 | 3 | 9 | 9 | 9 | 7 | 3 | 14 | 12 | 13 | 51 | 119 | 327 | 1333 | 1219 | 1289 | 1167 | 1083 | 864 |
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 |
High Tide | 7:38PM1.50m | 9:52AM1.29m | 8:06PM1.47m | 11:24AM1.23m | 8:42PM1.41m | |||||||||||||||
Low Tide | 1:57PM0.92m | 2:48AM0.33m | 2:28PM1.03m | 3:44AM0.37m | 3:06PM1.13m | |||||||||||||||
 |  |  | | |  |  | | | | | |  | | | | | | | | |
 | — | — | — | — | — | 5:24 | — | — | — | — | — | — | — | 5:26 | — | — | — | — | — | — |
 | — | 5:46 | — | — | — | — | — | — | — | 5:45 | — | — | — | — | — | — | — | 5:44 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 23 | 21 | 20 | 20 | 19 | 19 | 20 | 22 | 23 | 22 | 20 | 20 | 21 | 21 | 21 | 21 | 23 | 23 | 23 |
Feels °C | 17 | 19 | 16 | 15 | 15 | 13 | 13 | 14 | 16 | 19 | 18 | 15 | 15 | 17 | 17 | 17 | 17 | 21 | 20 | 21 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 9 | SE 9 | SSE 8 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 12 | SE 14 | SE 14 | SE 14 | SE 16 | SE 15 | SE 14 | SE 14 | SE 13 | SE 13 |
| kJ | 6 | 8 | 3 | 7 | 7 | 7 | 3 | 3 | 3 | 3 | 13 | 51 | 119 | 327 | 1014 | 1219 | 1289 | 1167 | 1083 | 864 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 7 | SE 8 | SE 8 | SE 7 | SE 7 | S 13 | S 12 | SE 12 | SE 12 | SE 8 | E 9 | E 9 | S 10 | SE 16 | E 10 | — | — | — | E 9 |
| kJ | 2 | 2 | 2 | 9 | 9 | 9 | 3 | 3 | 6 | 5 | 3 | 6 | 14 | 2 | 1333 | 8 | — | — | — | 7 |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 9 | — | SE 9 | SE 9 | SSE 9 | SSE 9 | SE 9 | SSE 12 | SSE 11 | SSE 11 | E 11 | — | — | — | — | — | — | — | — |
| kJ | 3 | 3 | — | 3 | 3 | 8 | 7 | 3 | 14 | 12 | 11 | 20 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 3 | NE 3 | NE 4 | NE 4 | NE 4 | NNE 4 | NNE 4 | NNE 4 | N 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | N 4 | N 4 | NNE 4 | NNE 4 | NNE 3 | NNE 4 | NE 3 |
| kJ | 9 | 9 | 10 | 17 | 14 | 16 | 19 | 19 | 18 | 15 | 15 | 15 | 15 | 14 | 14 | 15 | 11 | 7 | 13 | 3 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 885 | 145 | 487 | 470 | 470 | 470 | 470 | 470 | 228 | 491 | 491 | 487 | 487 | 228 | 145 | 228 | 487 | 509 | 470 | 488 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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