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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 2 am Wednesday 04 Feb 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
14.8° C
 (Which is 1.8°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 6AM is: 0.7m 4s primary swell from a Southwest direction and 0.4m 4s secondary swell from a Southwest direction (forecast issued at 02:00am February 04). The wind direction is predicted to be cross-offshore.

Time (JST) & DateWave HeightWave Period
Morning (04 Feb)2.5ft (0.8m)5s
Afternoon (04 Feb)3.5ft (1.1m)5s
Evening (04 Feb)3ft (0.9m)5s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Wednesday
04
Thursday
05
Friday
06
0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM
Rating
(10 max)
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.1
S
0.6
SW
0.7
SW
0.8
SW
0.8
SW
1.1
SW
1.1
SW
0.9
SW
0.5
SSW
0.4
SSW
0.1
E
0.2
S
0.1
S
0.1
S
0.2
SSW
0.4
SSW
0.4
SSW
0.4
SSW
0.4
SSW
0.4
SW
0.3
SSW
0.3
SSW
0.4
SSW
0.6
SSW
Period(s) (?)1044555556514412106677755577
Wave
Graph
(?)Metric surfscale
Energy kJ (?)210162638625845171041323131719217552033
Wind
(km/h)
15
SW
15
WSW
10
NNW
5
NNW
5
NE
5
SSE
0
SSE
10
NNE
15
N
10
NNE
10
NNE
10
NNE
5
E
5
ENE
10
ENE
5
N
5
NW
5
N
10
N
5
N
0
SSE
5
E
15
NE
30
NNE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
oncross-
on		cross-
off		cross-
off		glassglassglassoffoffoffoffoffglasscross-
off		cross-
off		glasscross-
off		glasscross-
off		offglassglasscross-
off		off
High Tide
/ height (m)
6:53AM
1.35
5:54PM
1.41
7:17AM
1.34
6:39PM
1.39
7:41AM
1.33
7:26PM
1.33
Low Tide
/ height (m)
12:05AM
0.00
12:17PM
0.68
12:40AM
0.08
12:54PM
0.59
1:14AM
0.18
1:32PM
0.50
Wednesday
04
Thursday
05
Friday
06
Sunrise---6:39-------6:37-------6:37----
Sunset-----5:12-------5:13-------5:14--
part cloud
clear
part cloud
clear
clear
clear
part cloud
cloud
cloud
clear
clear
clear
cloud
cloud
cloud
cloud
clear
part cloud
clear
clear
clear
part cloud
clear
cloud
Rain (mm)
------------------------
Temp. °C9865791010988891011111110991112129
Feels °C (?)432146764334667877568971
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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