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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 2 pm Saturday 10 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
15.5° C
 (Which is 2.0°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 8PM is: 1.9m 6s primary swell from a South-southwest direction and 0.1m 10s secondary swell from a East direction (forecast issued at 02:00pm January 10). The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (10 Jan)--
Afternoon (10 Jan)6ft (1.9m)6s
Evening (10 Jan)6.5ft (2.0m)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
Saturday
10
Sunday
11
Monday
12
Tuesday
13
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
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.2
SW
1.9
SW
1.6
SW
2
SSW
2.3
SSW
2.4
SSW
2
SSW
1.6
SW
2.1
SW
2.2
SW
1.8
WSW
1.6
WSW
1.3
WSW
2.1
WSW
0.4
SW
0.4
SW
0.3
SW
0.2
SSW
0.3
SW
1.3
SW
0.8
SW
1.2
SW
1.6
SW
1.9
SW
Period(s) (?)5666788667776610101010986666
Wave
Graph
(?)Metric surfscale
Energy kJ (?)6722017631255062044118236150729720911834732251591320651106200275
Wind
(km/h)
45
SW
50
SW
45
SW
50
SW
50
SW
45
SW
50
SW
55
SW
60
WSW
50
W
50
W
45
WSW
40
WSW
15
WSW
5
SSE
5
ENE
10
S
10
S
10
S
10
SW
25
WSW
25
WSW
45
WSW
50
WSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		cross-
on		cross-
on		oncross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		glassoncross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on
High Tide
/ height (m)
9:31AM
1.32
9:25PM
1.15
10:03AM
1.31
10:45PM
1.07
10:38AM
1.30
12:27AM
1.03
Low Tide
/ height (m)
3:41PM
0.62
3:31AM
0.53
4:40PM
0.54
4:13AM
0.69
5:47PM
0.45
5:05AM
0.83
Saturday
10
Sunday
11
Monday
12
Tuesday
13
Sunrise-------6:50-------6:50-------6:50
Sunset-4:46-------4:47-------4:47------
clear
clear
clear
clear
part cloud
cloud
cloud
cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
Rain (mm)
------------------------
Temp. °C1113131414141210118544444567767811
Feels °C (?)0234441-3-4-5-8-8-7-2-101123-1-1-3-1
  • 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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