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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 pm Saturday 17 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
14.8° C
 (Which is 2.5°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: 0.2m 5s primary swell from a South-southwest direction and 0.1m 6s secondary swell from a Southwest direction (forecast issued at 08:00pm January 17). An open ocean swell of 0.4m 3s is not directed at the surf break. The wind direction is predicted to be offshore.

Time (JST) & DateWave HeightWave Period
Morning (18 Jan)0.5ft (0.1m)11s
Afternoon (18 Jan)0.5ft (0.1m)11s
Evening (18 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
Sat
17
Sunday
18
Monday
19
Tuesday
20
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)
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.6
SW
0.8
SSW
0.5
SSW
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.2
ESE
0.1
E
0.4
SW
0.8
SW
1.6
SW
1.4
SW
0.6
SSW
0.4
SW
0.2
SSW
Period(s) (?)6661111111111111111111111116113556655
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1554719222222222222322251431332273
Wind
(km/h)
5
N
20
NNE
25
NNE
25
NNE
25
NE
30
NNE
15
NNE
15
ENE
15
ENE
20
NE
25
NE
25
NNE
25
NNE
20
NNE
15
N
5
NE
5
SSE
5
SW
25
WSW
25
W
25
NNE
30
NNE
25
NNE
20
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffoffoffoffoffoffcross-
off		cross-
off		cross-
off		offoffoffoffoffoffglassglasscross-
on		cross-
on		offoffoffoff
High Tide
/ height (m)
6:01AM
1.34
3:50PM
1.40
6:32AM
1.36
4:40PM
1.42
7:00AM
1.37
Low Tide
/ height (m)
10:34PM
-0.03
10:48AM
0.99
11:15PM
-0.06
11:30AM
0.92
11:55PM
-0.06
12:08PM
0.84
Sat
17
Sunday
18
Monday
19
Tuesday
20
Sunrise-----6:48-------6:48-------6:48--
Sunset-------4:53-------4:54-------4:55
clear
clear
clear
clear
clear
cloud
cloud
cloud
cloud
light rain
light rain
cloud
cloud
cloud
clear
clear
part cloud
clear
cloud
clear
part cloud
part cloud
part cloud
part cloud
Rain (mm)
---------11-------------
Temp. °C141398778910988778991112119778
Feels °C (?)117210-12464221147710653-2-11
  • 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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