Surf Forecasts:
How big are the waves at Rock Island today (31 Jul):
- Afternoon surf: Afternoon surf (31 Jul, local time) - 1.5ft (0.5m), 6s period with S swell.
- Evening surf: Evening surf (31 Jul, local time) - 1.5ft (0.5m), 6s period with S swell.
The current surf forecast for Rock Island at 7PM is: 0.4m 6s primary swell from a South-southwest direction and 0.1m 10s secondary swell from a Southeast direction, 0.3m 3s secondary swell from a South direction (forecast issued at 02:00pm July 31). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 Jul) | - | - |
| Afternoon (31 Jul) | 1.5ft (0.5m) | 6s |
| Evening (31 Jul) | 1.5ft (0.5m) | 6s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastSome drizzle, heaviest during Sat night. Warm (max 31°C on Sun afternoon, min 24°C on Sun night). Winds increasing (calm on Sat morning, fresh winds from the NE by Sun night). | ||||||||||||||||||||
Fri 31 | Saturday 1 | Sunday 2 | ||||||||||||||||||
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 6 | S 6 | SSW 6 | S 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | ESE 16 | ESE 16 | SE 17 | ESE 18 | SE 15 | ESE 16 | ESE 16 | SE 15 | SE 15 | SE 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 21 | 21 | 13 | 20 | 13 | 13 | 12 | 14 | 14 | 13 | 25 | 25 | 46 | 30 | 60 | 99 | 97 | 104 | 115 | 121 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross-off | off | off | glassy | cross-on | on | on | on | glassy | cross-off | off | cross-off | off | cross-off | cross-off | off |
High Tide | 7:07PM1.47m | 6:03AM1.53m | 7:32PM1.46m | 6:50AM1.50m | 7:56PM1.45m | |||||||||||||||
Low Tide | 12:16PM0.11m | 00:29AM0.82m | 12:51PM0.19m | 1:07AM0.73m | 1:26PM0.30m | |||||||||||||||
 | |  |  | | | | | | | |  | |  |  | | | | | | |
 | — | — | — | — | — | 4:48 | — | — | — | — | — | — | — | 4:50 | — | — | — | — | — | — |
 | — | — | 6:45 | — | — | — | — | — | — | — | 6:45 | — | — | — | — | — | — | — | 6:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — |
Temp °C | 29 | 29 | 28 | 28 | 27 | 27 | 27 | 28 | 29 | 29 | 29 | 28 | 28 | 29 | 28 | 28 | 29 | 31 | 28 | 24 |
Feels °C | 31 | 31 | 30 | 32 | 31 | 30 | 31 | 32 | 33 | 31 | 32 | 31 | 32 | 33 | 32 | 31 | 31 | 32 | 28 | 22 |
Swell 1 Height (m) Direction Period (s) | S 6 | SE 10 | SSW 6 | S 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SE 15 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SE 15 | ESE 16 | ESE 16 | SE 15 | SE 15 | SE 16 |
| kJ | 21 | 4 | 13 | 20 | 13 | 13 | 12 | 14 | 14 | 8 | 8 | 8 | 12 | 6 | 60 | 99 | 97 | 104 | 115 | 121 |
Swell 2 Height (m) Direction Period (s) | SE 9 | S 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 8 | SE 18 | ESE 16 | ESE 16 | SE 17 | ESE 14 | SSW 6 | S 6 | SSW 6 | SSW 6 | SSW 6 | SE 9 |
| kJ | 3 | 1 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 12 | 25 | 25 | 46 | 21 | 6 | 11 | 7 | 7 | 4 | 3 |
Swell 3 Height (m) Direction Period (s) | S 9 | S 11 | S 8 | S 8 | S 8 | S 8 | S 8 | SE 15 | SE 11 | SE 9 | SE 10 | SE 10 | SE 9 | ESE 18 | SE 9 | ESE 9 | SE 9 | SE 9 | SE 9 | SSW 6 |
| kJ | 1 | 3 | 1 | 1 | 1 | 1 | 1 | 9 | 4 | 3 | 4 | 4 | 3 | 30 | 3 | 8 | 3 | 3 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | — | S 6 | S 3 | — | — | — | — | — | — | SSW 6 | SSW 3 | SSW 4 | — | — | — | — | ENE 2 | ENE 2 | E 3 | ENE 3 |
| kJ | — | 21 | 2 | — | — | — | — | — | — | 13 | 2 | 2 | — | — | — | — | 1 | 1 | 4 | 6 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 16 | 77 | 77 | 77 | 77 | 55 | 54 | 54 | 16 | 77 | 76 | 38 | 0 | 0 | 0 | 0 | 0 | 12 | 12 | 487 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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