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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 pm Tuesday 20 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
14.9° C
 (Which is 2.3°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 5AM is: 0.2m 10s primary swell from a South-southeast direction and 0.1m 9s secondary swell from a South direction (forecast issued at 08:00pm January 20). An open ocean swell of 0.7m 4s is not directed at the surf break. The wind direction is predicted to be offshore.

Time (JST) & DateWave HeightWave Period
Morning (21 Jan)0.5ft (0.2m)10s
Afternoon (21 Jan)1ft (0.3m)10s
Evening (21 Jan)1.5ft (0.4m)10s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Tue
20
Wednesday
21
Thursday
22
Friday
23
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
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.2
SSW
0.2
SSW
0.1
SE
0.1
SE
0.2
SSE
0.2
SSE
0.2
SSE
0.3
SE
0.4
SE
0.4
SE
0.4
SE
0.4
SE
0.4
SE
0.4
SE
0.4
SE
0.4
SE
0.4
SE
0.3
SE
0.3
SE
0.3
SE
0.3
SE
0.2
ESE
0.2
SSW
0.2
SSW
Period(s) (?)66101010101010101010101010111111111010101088
Wave
Graph
(?)Metric surfscale
Energy kJ (?)444411111117272525282727293130181716161066
Wind
(km/h)
35
NNE
35
NNE
30
NNE
25
NNE
30
NNE
25
NNE
15
NNE
10
ESE
15
ESE
15
N
5
WNW
25
NNE
25
NNE
20
N
10
N
5
S
5
SE
20
NNE
15
NNE
10
N
5
NNW
10
N
0
SSW
10
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffoffoffoffoffoffcrosscrossoffglassoffoffoffcross-
off		glassglassoffoffoffglasscross-
off		glasscross-
on
High Tide
/ height (m)
5:28PM
1.43
7:27AM
1.36
6:15PM
1.41
7:54AM
1.35
7:03PM
1.36
8:20AM
1.34
Low Tide
/ height (m)
12:32AM
-0.01
12:47PM
0.76
1:08AM
0.08
1:26PM
0.68
1:43AM
0.19
2:08PM
0.60
Tue
20
Wednesday
21
Thursday
22
Friday
23
Sunrise-----6:48-------6:47-------6:47--
Sunset-------4:57-------4:58-------4:59
cloud
cloud
cloud
part cloud
cloud
cloud
cloud
cloud
cloud
light rain
rain showers
part cloud
part cloud
cloud
part cloud
cloud
cloud
cloud
part cloud
clear
clear
clear
clear
clear
Rain (mm)
---------21-------------
Temp. °C644322343344333454333345
Feels °C (?)-4-6-5-6-7-6-3-1-2-21-4-5-5-201-3-3-2-1-211
  • 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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