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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 2 pm Friday 13 Mar 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 1.7°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: 0.1m 18s primary swell from a East direction and 0.1m 10s secondary swell from a South direction (forecast issued at 02:00pm March 13). An open ocean swell of 0.8m 4s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (JST) & DateWave HeightWave Period
Morning (13 Mar)--
Afternoon (13 Mar)0.5ft (0.1m)18s
Evening (13 Mar)0.5ft (0.1m)18s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table
Friday
13
Saturday
14
Sunday
15
Monday
16
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
1
1
1
0
1
1
1
1
1
1
0
0
0
1
1
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.6
SSE
0.8
SSE
0.9
SSE
0.9
SSE
0.9
SE
0.8
SE
0.8
SE
0.6
SE
0.6
SE
0.6
SE
0.6
SE
0.6
SE
0.5
SE
0.4
SE
0.3
E
0.4
SE
0.4
SE
Period(s) (?)181818181818181010101010101010101010101010161012
Wave
Graph
(?)Metric surfscale
Energy kJ (?)97666888313018218515112012284806363644836442634
Wind
(km/h)
25
NNE
25
NE
35
ENE
35
NE
40
NNE
40
NNE
40
NNE
40
NNE
30
NE
25
NE
20
ENE
20
ENE
20
NE
15
NE
15
NNE
20
NNE
10
ENE
5
SE
10
SSE
10
SE
15
E
15
NE
20
NNE
15
NNE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffcross-
off		offoffoffoffoffoffcross-
off		cross-
off		cross-
off		offoffoffoffcross-
off		glasscross-
on		cross-
on		cross-
off		offoffoff
High Tide
/ height (m)
10:12AM
1.17
3:23AM
1.13
12:04PM
1.13
3:53AM
1.18
1:47PM
1.16
4:19AM
1.22
Low Tide
/ height (m)
6:56PM
0.24
7:45AM
1.01
8:10PM
0.21
8:58AM
0.91
9:08PM
0.17
Friday
13
Saturday
14
Sunday
15
Monday
16
Sunrise------5:54-------5:52-------5:52-
Sunset-5:45-------5:46-------5:47------
cloud
cloud
cloud
cloud
cloud
cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
cloud
cloud
light rain
cloud
Rain (mm)
----------------------1-
Temp. °C81099877710121210998910111111111089
Feels °C (?)0200-2-4-3-32565443368777635
  • 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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