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Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 am Sunday 15 Feb 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
16.7° C
 (Which is normal for this time of year)

How big are the waves at Rock Island today?

The current surf forecast for Rock Island at 4PM is: 0.9m 5s primary swell from a South-southwest direction and 0.5m 5s secondary swell from a South direction, 0.3m 10s secondary swell from a Southeast direction (forecast issued at 08:00am February 15). The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (15 Feb)3.5ft (1.1m)5s
Afternoon (15 Feb)3ft (0.9m)5s
Evening (15 Feb)2.5ft (0.7m)5s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Sunday
15
Monday
16
Tuesday
17
Wed
18
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)
0
1
1
0
0
0
0
1
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 (?)
1.1
SW
1.1
SW
0.9
SSW
0.9
SSW
0.3
SE
0.7
SSW
1.2
SW
0.7
SSW
0.5
SSW
0.4
SSW
0.2
E
0.3
SSW
0.3
SSW
0.3
S
0.3
S
0.2
SSE
0.2
SSE
0.2
SSE
0.2
SSE
0.1
E
0.1
E
0.2
E
0.2
E
0.2
E
Period(s) (?)5555105666612666665661010111111
Wave
Graph
(?)Metric surfscale
Energy kJ (?)646045392229953518121267673333229109
Wind
(km/h)
10
WNW
10
NNW
5
S
10
SSW
10
SSW
15
SW
10
WNW
10
N
20
NE
35
N
25
NE
25
ENE
25
E
25
ENE
35
NNE
25
NNE
25
NNE
20
NE
10
NE
10
ENE
5
SSE
10
SSE
5
SSE
5
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
off		glassononcross-
on		crosscross-
off		offoffoffcross-
off		cross-
off		cross-
off		offoffoffcross-
off		offcross-
off		cross-
on		cross-
on		glassglass
High Tide
/ height (m)
5:05AM
1.26
2:56PM
1.29
5:30AM
1.29
3:54PM
1.34
5:54AM
1.31
4:45PM
1.39
Low Tide
/ height (m)
9:57AM
0.94
10:19PM
0.03
10:37AM
0.84
10:59PM
0.02
11:13AM
0.72
11:37PM
0.04
Sunday
15
Monday
16
Tuesday
17
Wed
18
Sunrise-6:28-------6:28-------6:26------
Sunset---5:22-------5:23-------5:24----
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
cloud
part cloud
cloud
cloud
light rain
light rain
light rain
light rain
cloud
cloud
part cloud
cloud
cloud
cloud
cloud
Rain (mm)
-------------2431-------
Temp. °C1111121415141312111112111084344678866
Feels °C (?)7810121311109636542-4-4-3-1134444
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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