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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 pm Sunday 11 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
15.7° 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 2AM is: 0.9m 6s primary swell from a Southwest direction and 0.5m 11s secondary swell from a Southwest direction (forecast issued at 08:00pm January 11). The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (12 Jan)1.5ft (0.4m)10s
Afternoon (12 Jan)0.5ft (0.2m)9s
Evening (12 Jan)5ft (1.6m)8s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Sun
11
Monday
12
Tuesday
13
Wednesday
14
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
3
1
1
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.9
SW
1.5
WSW
1.3
WSW
0.9
SW
0.4
SW
0.4
SW
0.3
SW
0.2
SSW
0.2
SSW
1.6
SW
0.9
SW
1.1
SW
1.5
SW
1.9
SW
2.1
SW
2.1
SW
2.1
SW
2.1
SW
1.7
SW
1.5
SW
2.1
SW
0.9
SW
0.6
SSW
0.3
SW
Period(s) (?)776611101099866666777889999
Wave
Graph
(?)Metric surfscale
Energy kJ (?)383198149663027158826964981772933743603603933202506431205512
Wind
(km/h)
45
W
45
W
35
W
15
W
10
S
5
ESE
5
S
10
S
10
S
10
SW
25
W
20
W
45
WSW
50
WSW
55
SW
55
WSW
50
WSW
55
WSW
35
WSW
20
W
15
NE
15
NE
5
NE
10
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
on		cross-
on		cross-
on		onglassoncross-
on		oncross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		crossoffcross-
off		offcross-
on
High Tide
/ height (m)
10:45PM
1.07
10:38AM
1.30
12:27AM
1.03
11:18AM
1.30
2:21AM
1.07
12:06PM
1.30
Low Tide
/ height (m)
4:40PM
0.54
4:13AM
0.69
5:47PM
0.45
5:05AM
0.83
6:56PM
0.35
6:15AM
0.96
Sun
11
Monday
12
Tuesday
13
Wednesday
14
Sunrise-----6:50-------6:50-------6:50--
Sunset-------4:47-------4:49-------4:50
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
------------------------
Temp. °C65444556776681013131211987789
Feels °C (?)-6-7-6-2-111132-10-3-2110-2021244
  • 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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