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Surf Forecasts:
Rock Island surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 8 am Saturday 21 Feb 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
16.1° C
(Which is normal for this time of year)How big are the waves at Rock Island today?
The current surf forecast for Rock Island at 1PM is: 0.1m 12s primary swell from a East direction (forecast issued at 08:00am February 21). The wind direction is predicted to be glassy.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Feb) | 0.5ft (0.1m) | 12s |
| Afternoon (21 Feb) | 0.5ft (0.1m) | 4s |
| Evening (21 Feb) | 0.5ft (0.1m) | 12s |
Table - waves today at Rock Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 21 | Sunday 22 | Monday 23 | Tue 24 | |||||||||||||||||||||
| 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 | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | — | |||||||||||||||||||||||
| Period(s) (?) | 4 | 12 | 12 | 4 | 12 | 12 | 12 | - | 6 | 12 | 12 | 4 | 4 | 5 | 6 | 6 | 6 | 6 | 7 | 6 | 6 | 6 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1 | 3 | 3 | 1 | 3 | 3 | 3 | 0 | 1 | 3 | 3 | 10 | 28 | 69 | 160 | 229 | 244 | 252 | 214 | 197 | 223 | 209 | 32 | 22 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | glass | glass | glass | cross | glass | cross- on | on | on | on | on | on | on | on | on | on | on | on | on | cross- off | off | off |
High Tide / height (m) | 7:26AM 1.33 | 7:48PM 1.30 | 7:50AM 1.32 | 8:39PM 1.21 | 8:15AM 1.31 | 9:41PM 1.11 | ||||||||||||||||||
Low Tide / height (m) | 1:36PM 0.34 | 1:47AM 0.45 | 2:18PM 0.29 | 2:17AM 0.59 | 3:05PM 0.27 | 2:46AM 0.74 | ||||||||||||||||||
Saturday 21 | Sunday 22 | Monday 23 | Tue 24 | |||||||||||||||||||||
| Sunrise | - | 6:22 | - | - | - | - | - | - | - | 6:20 | - | - | - | - | - | - | - | 6:20 | - | - | - | - | - | - |
| Sunset | - | - | - | 5:28 | - | - | - | - | - | - | - | 5:29 | - | - | - | - | - | - | - | 5:30 | - | - | - | - |
 |  | | | |  | | | | |  | | | | |  |  |  | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 | - | - | - | - | - | - |
| Temp. °C | 7 | 8 | 10 | 12 | 12 | 12 | 12 | 12 | 11 | 12 | 13 | 14 | 15 | 15 | 15 | 15 | 14 | 16 | 17 | 18 | 18 | 14 | 11 | 11 |
| Feels °C (?) | 2 | 3 | 6 | 9 | 10 | 10 | 9 | 10 | 8 | 8 | 7 | 7 | 8 | 8 | 8 | 8 | 6 | 10 | 11 | 12 | 13 | 10 | 5 | 6 |
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Rock Island surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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