Surf Forecasts:
How big are the waves at Rock Island today (18 Sep):
- Morning surf: Morning surf (18 Sep, local time) - 0.5ft (0.1m), 12s period with S swell.
- Afternoon surf: Afternoon surf (18 Sep, local time) - 0.5ft (0.2m), 11s period with SSE swell.
- Evening surf: Evening surf (18 Sep, local time) - 1.5ft (0.4m), 15s period with SE swell.
The current surf forecast for Rock Island at 6AM is: 0.1m 8s primary swell from a Southeast direction and 0.1m 13s secondary swell from a South direction (forecast issued at 02:00am September 18). 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 (18 Sep) | 0.5ft (0.1m) | 12s |
| Afternoon (18 Sep) | 0.5ft (0.2m) | 11s |
| Evening (18 Sep) | 1.5ft (0.4m) | 15s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 148mm), heaviest during Sun night. Warm (max 24°C on Sat afternoon, min 20°C on Fri morning). Winds increasing (moderate winds from the NNE on Sat night, strong winds from the N by Sun night). | ||||||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||||||||||
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) | SE 7 | SSE 8 | S 13 | S 12 | SE 12 | SSE 11 | SE 14 | SE 15 | SE 14 | SE 14 | SE 16 | SE 15 | SE 14 | SE 14 | SE 13 | SE 13 | SE 12 | SE 12 | SE 12 | SSE 12 | SSE 12 | SSE 12 | SSE 13 | SSE 13 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 9 | 7 | 3 | 3 | 6 | 12 | 32 | 76 | 164 | 368 | 1591 | 1376 | 1407 | 1214 | 1083 | 864 | 657 | 597 | 587 | 885 | 949 | 1064 | 1344 | 1622 |
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 | 9:52AM1.29m | 8:06PM1.47m | 11:24AM1.23m | 8:42PM1.41m | 1:35PM1.24m | |||||||||||||||||||
Low Tide | 2:48AM0.33m | 2:28PM1.03m | 3:44AM0.37m | 3:06PM1.13m | 4:55AM0.41m | 4:31PM1.21m | ||||||||||||||||||
 |  |  | |  | | | | | | | |  | |  | | | |  |  | | |  | | |
 | — | 5:24 | — | — | — | — | — | — | — | 5:26 | — | — | — | — | — | — | — | 5:26 | — | — | — | — | — | — |
 | — | — | — | — | — | 5:45 | — | — | — | — | — | — | — | 5:44 | — | — | — | — | — | — | — | 5:43 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 3 | — | 3 | 9 | 5 | 10 | 19 | 22 |
Temp °C | 21 | 20 | 19 | 20 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 24 | 24 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 22 | 22 |
Feels °C | 16 | 15 | 13 | 14 | 17 | 17 | 16 | 17 | 17 | 17 | 16 | 17 | 19 | 23 | 24 | 21 | 22 | 21 | 19 | 20 | 20 | 18 | 18 | 18 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 11 | SE 15 | SE 14 | SE 14 | SE 16 | SE 15 | SE 14 | SE 14 | SE 13 | SE 13 | SE 12 | SE 12 | SE 12 | SSE 12 | SSE 12 | SSE 12 | SSE 13 | SSE 13 |
| kJ | 7 | 7 | 3 | 3 | 3 | 3 | 20 | 76 | 164 | 368 | 1144 | 1376 | 1407 | 1214 | 1083 | 864 | 657 | 597 | 587 | 885 | 949 | 1064 | 1344 | 1622 |
Swell 2 Height (m) Direction Period (s) | SE 7 | SE 7 | S 13 | S 12 | SE 12 | SE 12 | E 9 | E 9 | E 8 | S 10 | SE 16 | — | — | — | — | S 9 | S 9 | — | SSE 15 | — | — | SSE 14 | E 13 | E 13 |
| kJ | 9 | 2 | 3 | 3 | 6 | 5 | 16 | 7 | 23 | 2 | 1591 | — | — | — | — | 2 | 2 | — | 169 | — | — | 777 | 3 | 3 |
Swell 3 Height (m) Direction Period (s) | SE 9 | SSE 8 | SE 9 | SE 9 | SE 12 | SSE 11 | SE 14 | E 9 | — | E 8 | — | — | — | — | — | — | — | — | — | — | — | E 13 | — | — |
| kJ | 3 | 7 | 3 | 3 | 6 | 12 | 32 | 23 | — | 12 | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 4 | N 4 | N 4 | NNE 4 | NNE 4 | NE 3 | NE 4 | NNE 4 | NE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 3 | NNE 4 | NNE 4 |
| kJ | 14 | 16 | 19 | 19 | 16 | 18 | 18 | 18 | 11 | 10 | 13 | 14 | 7 | 5 | 14 | 8 | 2 | 3 | 6 | 8 | 7 | 10 | 16 | 21 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 470 | 470 | 470 | 470 | 552 | 491 | 491 | 487 | 491 | 228 | 228 | 487 | 488 | 0 | 0 | 0 | 0 | 488 | 74 | 74 | 565 | 552 | 552 | 510 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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