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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 pm Thursday 08 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
15.4° C
 (Which is 2.3°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 4AM is: 0.1m 8s primary swell from a Southwest direction and 0.1m 5s secondary swell from a Southwest direction (forecast issued at 08:00pm January 08). An open ocean swell of 0.3m 2s is not directed at the surf break. The wind direction is predicted to be offshore.

Time (JST) & DateWave HeightWave Period
Morning (09 Jan)0.5ft (0.1m)12s
Afternoon (09 Jan)0.5ft (0.1m)8s
Evening (09 Jan)0.5ft (0.1m)11s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Thu
08
Friday
09
Saturday
10
Sunday
11
6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM
Rating
(10 max)
0
0
0
0
0
0
0
0
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 (?)
0.6
SSW
0.4
SW
0.2
SSW
0.1
SW
0.1
SW
0.1
S
0.1
SW
0.1
SW
0.1
E
0.1
E
0.1
E
0.1
E
0.4
SW
0.7
SW
1.3
SW
1.7
SW
1.6
SSW
2.3
SSW
2.4
SSW
2.5
SW
2.3
SW
2.3
SW
1.9
SW
2.1
SW
Period(s) (?)68588128811111110345667887777
Wave
Graph
(?)Metric surfscale
Energy kJ (?)2418333332232232080182166486620868558480351410
Wind
(km/h)
40
NNE
35
NNE
30
N
25
N
15
N
10
NNE
5
SSE
15
S
20
S
15
SSW
10
WSW
10
W
15
WSW
25
SW
45
SW
45
SW
45
SW
45
SW
50
SW
55
SW
60
WSW
65
WSW
55
WSW
60
WSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffoffoffoffoffglasscross-
on		ononcross-
on		crosscross-
on		cross-
on		cross-
on		cross-
on		cross-
on		oncross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on
High Tide
/ height (m)
7:27PM
1.33
9:01AM
1.34
8:22PM
1.25
9:31AM
1.32
9:25PM
1.15
10:03AM
1.31
Low Tide
/ height (m)
2:14AM
0.23
2:48PM
0.69
2:52AM
0.37
3:41PM
0.62
3:31AM
0.53
Thu
08
Friday
09
Saturday
10
Sunday
11
Sunrise-----6:50-------6:50-------6:50--
Sunset-------4:45-------4:46-------4:47
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
cloud
clear
clear
clear
Rain (mm)
------------------------
Temp. °C6544346788876811131312141311998
Feels °C (?)-5-5-5-4-4-122234311024342-3-6-5-7
  • 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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