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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 am Monday 01 Jun 2026 JSTForecast update in hr min s Forecast update imminent
Rock Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Rock Island sea temperature is
21.0° C
(Which is slightly cooler than normal)How big are the waves at Rock Island today (01 Jun):
- Morning surf: Morning surf (01 Jun, local time) - 2ft (0.6m), 11s period with S swell.
- Afternoon surf: Afternoon surf (01 Jun, local time) - 2ft (0.6m), 14s period with SSW swell.
- Evening surf: Evening surf (01 Jun, local time) - 2.5ft (0.7m), 13s period with SSW swell.
The current surf forecast for Rock Island at 2PM is: 0.6m 14s primary swell from a South-southwest direction and 0.5m 10s secondary swell from a South direction, 0.5m 3s secondary swell from a South direction (forecast issued at 08:00am June 01). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (01 Jun) | 2ft (0.6m) | 11s |
| Afternoon (01 Jun) | 2ft (0.6m) | 14s |
| Evening (01 Jun) | 2.5ft (0.7m) | 13s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 230mm), heaviest during Wed morning. Warm (max 24°C on Mon morning, min 18°C on Tue night). Winds increasing (light winds from the SSW on Mon morning, gales from the N by Wed afternoon). | ||||||||||||||||||||||||
Monday 1 | Tuesday 2 | Wednesday 3 | Thu 4 | |||||||||||||||||||||
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 | 12 AM | 3 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
S 11 | S 11 | S 11 | SSW 14 | S 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 14 | SSW 14 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SE 6 | SSE 7 | SE 10 | SSW 15 | SSW 14 | SSW 13 | SSW 12 | SSW 11 | |
119 | 86 | 85 | 145 | 163 | 168 | 238 | 242 | 238 | 147 | 125 | 261 | 142 | 263 | 127 | 96 | 312 | 310 | 3189 | 2813 | 4555 | 1326 | 749 | 471 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | on | on | on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | |
High Tide | 4:05AM1.44m | 6:40PM1.39m | 4:40AM1.45m | 7:23PM1.39m | 5:17AM1.45m | 8:06PM1.37m | ||||||||||||||||||
Low Tide | 11:23AM-0.08m | 11:32PM0.97m | 12:03PM-0.10m | 00:12AM0.99m | 12:43PM-0.08m | 00:54AM1.00m | ||||||||||||||||||
 | | | | |  |  | |  | | | | |  |  |  |  | | | |  | | | | |
 | 4:28 | — | — | — | — | — | — | 4:28 | — | — | — | — | — | — | — | 4:28 | — | — | — | — | — | — | — | 4:26 |
 | — | — | — | — | 6:50 | — | — | — | — | — | — | — | 6:51 | — | — | — | — | — | — | — | 6:51 | — | — | 6:52 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 8 | 24 | 69 | 68 | 50 | 8 | 1 | — | — | |
Temp °C | 21 | 23 | 24 | 24 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 18 | 18 | 18 | 19 | 21 | 19 | 18 | 19 | 19 | 19 |
22 | 23 | 23 | 21 | 18 | 18 | 18 | 18 | 19 | 18 | 18 | 18 | 19 | 19 | 17 | 17 | 16 | 14 | 15 | 8 | 6 | 10 | 13 | 16 | |
Swell 1 Height (m) Direction Period (s) | S 11 | S 11 | S 11 | SSW 14 | S 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 12 | SSE 6 | SW 13 | SSE 9 | SSE 11 | SSW 14 | SSW 13 | SSW 12 | SSW 11 |
 kJ | 119 | 86 | 85 | 145 | 163 | 168 | 238 | 242 | 238 | 147 | 109 | 261 | 142 | 263 | 127 | 96 | 73 | 42 | 924 | 1826 | 4555 | 1326 | 749 | 471 |
Swell 2 Height (m) Direction Period (s) | S 5 | S 5 | SSW 16 | S 10 | SSW 15 | SSW 15 | SSW 18 | SW 17 | SW 16 | SSW 14 | SSW 14 | SE 11 | SW 13 | SE 11 | S 5 | S 5 | SSW 13 | SW 15 | SW 16 | SSW 15 | SE 11 | SSE 11 | SE 10 | SE 10 |
| kJ | 21 | 14 | 53 | 48 | 89 | 87 | 31 | 71 | 64 | 138 | 125 | 5 | 88 | 5 | 15 | 14 | 109 | 36 | 89 | 2813 | 690 | 560 | 225 | 134 |
Swell 3 Height (m) Direction Period (s) | SSW 17 | SSW 14 | SSW 14 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | S 15 | SE 11 | ESE 10 | SE 11 | SW 15 | SE 11 | S 14 | SW 12 | SSW 19 | — | — | N 5 | — |
| kJ | 29 | 39 | 36 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 5 | 9 | 5 | 35 | 5 | 4 | 25 | 1247 | — | — | 34 | — |
Wind waves Height (m) Direction Period (s) | — | SSW 5 | SSW 5 | S 3 | SSW 4 | SSW 4 | SSW 4 | SSW 4 | SSW 4 | SSW 3 | S 4 | S 4 | S 4 | — | — | SSE 5 | SE 6 | SSE 7 | SE 10 | NE 4 | N 6 | NNW 5 | NNW 5 | — |
| kJ | — | 18 | 9 | 5 | 25 | 28 | 14 | 10 | 7 | 4 | 9 | 9 | 6 | — | — | 47 | 312 | 310 | 3189 | 63 | 342 | 102 | 9 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 10 | 18 | 18 | 77 | 92 | 27 | 27 | 27 | 14 | 77 | 77 | 77 | 77 | 29 | 77 | 811 | 4 | 510 | 488 | 487 | 487 | 38 | 27 | 0 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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