Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 2 am Thursday 09 Apr 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
15.6° C
(Which is 2.1°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 9AM is: 0.3m 8s primary swell from a Southeast direction and 0.1m 11s secondary swell from a Southeast direction, 0.5m 3s secondary swell from a South-southwest direction (forecast issued at 02:00am April 09). The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (09 Apr)1ft (0.3m)8s
Afternoon (09 Apr)3.5ft (1.1m)5s
Evening (09 Apr)3.5ft (1.0m)5s

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


Updates in  hr  min  s Forecast update imminent
Thursday
09
Friday
10
Saturday
11
0AM3AM6AM9AM12PM3PM6PM9PM0AM3AM6AM9AM12PM3PM6PM9PM0AM3AM6AM9AM12PM3PM6PM9PM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
1
3
2
1
1
0
Swell
Height Map
Wave Height (m) & direction (?)
0.3
SSW
0.2
SSW
0.2
SSW
0.3
SE
0.9
SSW
1.1
SSW
1.3
SSW
1
SSW
0.9
SSW
1.2
S
1.6
S
1.7
S
1.7
S
1.9
S
3.5
SSW
3
SSW
2.4
SSW
2.2
SSW
1.4
SSW
2
SSW
1.4
SSW
1.7
SSW
1
SSW
0.9
SSW
Period(s) (?)888845554566778999987888
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1376927567547346617522826235514271480897781297560214348133122
Wind
(km/h)
25
SW
15
SW
20
SW
25
SW
35
SSW
40
SSW
40
SSW
35
SSW
30
SSW
35
SSW
40
SSW
40
SSW
40
SSW
40
SSW
25
SSW
10
SW
25
SW
25
SW
10
W
0
NNW
5
ENE
10
SSE
5
ESE
25
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
onononononononononononononononcross-
on
ononcrossglasscross-
off
cross-
on
glassoff
High Tide
/ height (m)
10:12PM
1.13
7:49AM
1.27
11:44PM
1.10
8:33AM
1.19
1:18AM
1.11
9:53AM
1.10
Low Tide
/ height (m)
2:29AM
0.95
3:41PM
0.17
3:32AM
1.01
4:52PM
0.24
5:41AM
1.01
6:14PM
0.29
Thursday
09
Friday
10
Saturday
11
Sunrise--5:18-------5:16-------5:16-----
Sunset------6:07-------6:08-------6:09-
clear
part cloud
clear
clear
part cloud
cloud
cloud
cloud
light rain
light rain
light rain
light rain
light rain
light rain
light rain
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
--------11142351--------
Temp. °C131413141616161615161616171718181818171820212119
Feels °C (?)8109998810910910121216181615171920212114
  • 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

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.


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