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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 2 pm Thursday 15 Jan 2026 JST
Forecast 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
15.0° C
 (Which is 2.4°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 10PM is: 1.8m 6s primary swell from a Southwest direction and 0.1m 9s secondary swell from a Southeast direction (forecast issued at 02:00pm January 15). The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (15 Jan)--
Afternoon (15 Jan)1.5ft (0.4m)4s
Evening (15 Jan)6ft (1.8m)6s

Table - waves today at Rock Island. (Swell directed towards the surf break)

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Thursday
15
Friday
16
Saturday
17
Sunday
18
12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM
Rating
(10 max)
0
0
0
0
0
0
3
1
1
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.2
SSW
0.4
SW
1.5
SW
1.8
SW
1.8
SW
1.6
SW
2.1
SW
1
SSW
0.7
SSW
0.5
SSW
0.4
SSW
0.4
SSW
0.3
SSW
0.3
SSW
0.2
S
0.3
SW
0.9
SW
0.6
SSW
0.9
SSW
0.8
SSW
0.6
SSW
0.3
SSW
0.1
E
0.1
E
Period(s) (?)54666777887777545566651111
Wave
Graph
(?)Metric surfscale
Energy kJ (?)34146273244220410111503221211110244519574725522
Wind
(km/h)
5
SSW
25
SW
40
WSW
45
WSW
45
WSW
45
WSW
10
NW
10
NE
10
NE
10
ENE
5
ESE
5
ESE
10
NNE
10
NNE
10
NNE
5
NNE
0
NE
5
ESE
5
ENE
15
N
25
NNE
35
NNE
30
NNE
25
NNE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
oncross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
off		offoffcross-
off		crosscrossoffoffoffglassglasscross-
off		cross-
off		offoffoffoffoff
High Tide
/ height (m)
1:02PM
1.32
4:46AM
1.23
2:00PM
1.34
5:27AM
1.30
2:57PM
1.37
6:01AM
1.34
Low Tide
/ height (m)
8:58PM
0.13
9:01AM
1.05
9:49PM
0.03
10:01AM
1.03
10:34PM
-0.03
Thursday
15
Friday
16
Saturday
17
Sunday
18
Sunrise-------6:50-------6:48-------6:48
Sunset-4:51-------4:52-------4:52------
cloud
cloud
cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
Rain (mm)
------------------------
Temp. °C9111213131311111214141412111091112121211977
Feels °C (?)6422337791011118776999840-1-1
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

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FREE! Surf-Forecast.com widget for your website

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.

View detailed surf forecast for Rock Island at:
surf-forecast.com

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