Surf Forecasts:
How big are the waves at Rock Island today (25 Aug):
- Morning surf: Morning surf (25 Aug, local time) - 4.5ft (1.4m), 13s period with SSE swell.
- Afternoon surf: Afternoon surf (25 Aug, local time) - 3.5ft (1.0m), 12s period with SSE swell.
- Evening surf: Evening surf (25 Aug, local time) - 4ft (1.2m), 12s period with S swell.
The current surf forecast for Rock Island at 6AM is: 1.4m 13s primary swell from a South-southeast direction and 0.1m 14s secondary swell from a East direction, 0.4m 4s secondary swell from a South-southwest direction (forecast issued at 02:00am August 25). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (25 Aug) | 4.5ft (1.4m) | 13s |
| Afternoon (25 Aug) | 3.5ft (1.0m) | 12s |
| Evening (25 Aug) | 4ft (1.2m) | 12s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 13mm), heaviest on Thu night. Warm (max 31°C on Wed afternoon, min 23°C on Thu night). Winds decreasing (fresh winds from the SSW on Tue afternoon, light winds from the SW by Thu night). | ||||||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||||||||||
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) | SSE 14 | S 14 | SSE 13 | SSE 13 | SSE 13 | SSE 12 | S 12 | S 12 | S 12 | S 12 | S 12 | SSW 12 | SSW 11 | SSW 12 | SSW 11 | SSW 11 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | S 11 | SSW 5 | S 10 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 711 | 836 | 700 | 690 | 484 | 298 | 403 | 403 | 407 | 362 | 280 | 183 | 167 | 140 | 135 | 98 | 69 | 74 | 49 | 47 | 49 | 36 | 53 | 30 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | on | on | on | on | on | cross-on | on | cross-on | on | on | on | off | off |
High Tide | 1:21AM1.36m | 4:45PM1.39m | 2:39AM1.41m | 5:10PM1.43m | 3:40AM1.47m | 5:33PM1.46m | ||||||||||||||||||
Low Tide | 9:11AM0.27m | 9:41PM1.08m | 10:00AM0.23m | 10:21PM0.97m | 10:42AM0.22m | |||||||||||||||||||
 | |  | | | | | | | |  | | | |  |  | | | | | | | |  | |
 | — | 5:07 | — | — | — | — | — | — | — | 5:07 | — | — | — | — | — | — | — | 5:09 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:19 | — | — | — | — | — | — | — | 6:17 | — | — | — | — | — | — | — | 6:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 2 |
Temp °C | 27 | 27 | 27 | 28 | 29 | 29 | 29 | 28 | 27 | 27 | 27 | 28 | 29 | 31 | 30 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 25 | 23 |
Feels °C | 29 | 30 | 30 | 30 | 29 | 29 | 28 | 29 | 29 | 30 | 30 | 31 | 31 | 32 | 30 | 28 | 30 | 32 | 32 | 32 | 31 | 32 | 25 | 23 |
Swell 1 Height (m) Direction Period (s) | SSE 14 | S 14 | SSE 13 | SSE 13 | SSE 13 | SSE 12 | S 12 | S 12 | S 12 | S 12 | S 12 | SSW 12 | SSW 11 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SSW 6 | SSW 6 | S 6 | S 6 | S 11 | SSW 6 | S 6 |
| kJ | 711 | 836 | 700 | 690 | 484 | 298 | 403 | 403 | 407 | 362 | 280 | 183 | 167 | 140 | 135 | 98 | 69 | 47 | 35 | 25 | 27 | 35 | 31 | 24 |
Swell 2 Height (m) Direction Period (s) | S 17 | ESE 14 | E 14 | E 14 | S 16 | S 14 | E 13 | E 13 | E 13 | SE 10 | SSW 5 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | SSW 11 | SSE 9 | SSE 8 | S 11 | SE 10 | S 10 | S 10 |
| kJ | 351 | 41 | 4 | 4 | 181 | 243 | 3 | 3 | 3 | 25 | 15 | 48 | 48 | 32 | 33 | 33 | 32 | 47 | 30 | 24 | 37 | 24 | 32 | 30 |
Swell 3 Height (m) Direction Period (s) | SW 8 | E 14 | ESE 14 | ESE 14 | E 14 | E 13 | E 13 | ESE 13 | ESE 13 | E 13 | SE 10 | SSW 5 | E 12 | E 12 | E 11 | E 11 | S 10 | SSE 9 | SSW 11 | SW 10 | SW 10 | SW 10 | SSE 10 | SSE 10 |
| kJ | 18 | 37 | 41 | 66 | 4 | 3 | 31 | 34 | 33 | 3 | 25 | 9 | 3 | 3 | 3 | 3 | 19 | 27 | 45 | 27 | 26 | 15 | 18 | 18 |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 4 | SSW 4 | SSW 4 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | SSW 5 | SSW 5 | SW 4 | SW 4 | SSW 5 | SSW 5 | SSW 5 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 5 | N 2 |
| kJ | 8 | 13 | 6 | 6 | 24 | 45 | 50 | 42 | 29 | 21 | 24 | 16 | 13 | 37 | 70 | 73 | 69 | 74 | 49 | 47 | 49 | 36 | 53 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 14 | 12 | 12 | 14 | 249 | 249 | 249 | 27 | 12 | 10 | 10 | 14 | 534 | 534 | 518 | 491 | 14 | 14 | 12 | 14 | 14 | 12 | 1 | 0 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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