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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 pm Monday 13 Apr 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
16.0° C
(Which is 2.0°C colder than average for this time of year)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 8PM is: 0.6m 11s primary swell from a Southeast direction and 0.3m 11s secondary swell from a Southeast direction, 0.4m 5s secondary swell from a South-southeast direction (forecast issued at 02:00pm April 13). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Apr) | - | - |
| Afternoon (13 Apr) | 1ft (0.3m) | 11s |
| Evening (13 Apr) | 2ft (0.6m) | 11s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | |||||||||||||||||||||
| 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 13 | 17 | 17 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 15 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 19 | 19 | 19 | 73 | 19 | 19 | 31 | 44 | 48 | 50 | 71 | 72 | 73 | 79 | 381 | 246 | 539 | 724 | 730 | 693 | 763 | 742 | 742 | 752 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- on | cross- on | cross- on | cross | glass | off | cross- off | glass | cross- on | cross | cross | cross | cross | glass | glass | on | on | on | cross- on | glass | cross- off | off | off |
High Tide / height (m) | 1:47PM 1.11 | 3:19AM 1.22 | 2:58PM 1.19 | 3:44AM 1.25 | 3:54PM 1.28 | 4:08AM 1.28 | ||||||||||||||||||
Low Tide / height (m) | 8:32PM 0.34 | 9:12AM 0.61 | 9:22PM 0.36 | 9:48AM 0.45 | 10:04PM 0.40 | |||||||||||||||||||
Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:09 | - | - | - | - | - | - | - | 5:09 | - |
| Sunset | - | - | 6:12 | - | - | - | - | - | - | - | 6:12 | - | - | - | - | - | - | - | 6:13 | - | - | - | - | - |
 |  | |  |  | |  | | | | | |  | | | | | | | |  |  |  |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 6 | 10 | 5 |
| Temp. °C | 19 | 19 | 18 | 17 | 17 | 16 | 16 | 17 | 20 | 19 | 18 | 17 | 17 | 17 | 16 | 17 | 18 | 18 | 18 | 18 | 17 | 14 | 12 | 11 |
| Feels °C (?) | 18 | 17 | 16 | 16 | 18 | 17 | 15 | 15 | 20 | 17 | 15 | 16 | 16 | 17 | 16 | 17 | 17 | 16 | 17 | 19 | 18 | 9 | 5 | 3 |
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Live Wave Height (m)
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Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
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