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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 am Wednesday 14 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 1.9°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 11AM is: 0.7m 9s primary swell from a South-southwest direction and 0.1m 11s secondary swell from a East direction (forecast issued at 08:00am January 14). The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (14 Jan)2.5ft (0.8m)9s
Afternoon (14 Jan)1.5ft (0.4m)9s
Evening (14 Jan)1ft (0.3m)9s

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
14
Thursday
15
Friday
16
Sat
17
6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM
Rating
(10 max)
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
1
1
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.9
SW
0.8
SSW
0.6
SSW
0.4
SW
0.4
SW
0.3
SW
0.2
SSW
0.2
SSW
0.2
SSW
0.1
SE
0.3
SW
0.2
SSW
1.5
SW
1.8
SW
1.9
SW
1.7
SW
2.1
SW
1
SSW
0.7
SW
0.6
SSW
0.4
SSW
0.4
SW
0.4
SW
0.2
SSW
Period(s) (?)9999999661048666777888887
Wave
Graph
(?)Metric surfscale
Energy kJ (?)5731085521211384443615624428425538511159412315155
Wind
(km/h)
5
SE
10
SSE
10
SSE
10
E
10
NE
20
NNE
15
NE
10
NNE
10
N
5
NNW
5
SSW
20
SW
40
WSW
45
WSW
55
WSW
30
W
10
NNW
15
NE
10
NE
10
ENE
10
ENE
10
NE
15
NE
15
NNE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
on		cross-
on		cross-
off		cross-
off		offoffoffoffglassononcross-
on		cross-
on		cross-
on		cross-
on		cross-
off		offoffcross-
off		cross-
off		offoffoff
High Tide
/ height (m)
12:06PM
1.30
3:49AM
1.15
1:02PM
1.32
4:46AM
1.23
2:00PM
1.34
Low Tide
/ height (m)
6:15AM
0.96
8:01PM
0.24
7:43AM
1.03
8:58PM
0.13
9:01AM
1.05
9:49PM
0.03
Wednesday
14
Thursday
15
Friday
16
Sat
17
Sunrise-6:50-------6:50-------6:50------
Sunset---4:50-------4:51-------4:52----
clear
clear
part cloud
clear
part cloud
clear
clear
clear
clear
clear
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
------------------------
Temp. °C991010108766681012121312111112131413119
Feels °C (?)5566521123542114878910954
  • 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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