Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 pm Saturday 18 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
16.6° C
(Which is 1.6°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 12AM is: 1.4m 15s primary swell from a South-southeast direction and 0.2m 10s secondary swell from a East direction (forecast issued at 08:00pm April 18). The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (19 Apr)--
Afternoon (19 Apr)--
Evening (19 Apr)4.5ft (1.4m)15s

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


Updates in  hr  min  s Forecast update imminent
Sat
18
Sunday
19
Monday
20
Tuesday
21
6PM9PM0AM3AM6AM9AM12PM3PM6PM9PM0AM3AM6AM9AM12PM3PM6PM9PM0AM3AM6AM9AM12PM3PM
Rating
(10 max)
0
2
2
3
3
3
3
1
1
2
3
3
2
3
1
0
0
0
0
0
0
0
1
0
Swell
Height Map
Wave Height (m) & direction (?)
1.5
SSE
1.4
SSE
1.4
SSE
1.4
SSE
1.4
SSE
1.5
SSE
1.5
SSE
1.5
SSE
1.6
SSE
1.5
SSE
1.5
SSE
1.4
SE
1.4
SE
1.3
SE
1.1
SE
1.1
SE
0.9
SE
0.8
SE
0.8
SE
0.8
SE
0.7
SE
0.6
SE
0.5
SE
0.5
SE
Period(s) (?)151515151414151514151414141313131212121212121111
Wave
Graph
(?)Metric surfscale
Energy kJ (?)96282286985784589991191110729879478347115774443742562101721691421086059
Wind
(km/h)
15
S
10
SSE
5
S
0
N
5
N
10
NE
5
E
15
S
15
S
5
SE
5
E
10
ENE
15
ENE
10
E
10
SSW
20
S
20
S
20
S
20
SSW
20
SW
25
SW
10
WNW
20
NNE
10
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
cross-
on
cross-
on
glassglasscross-
off
cross-
off
ononcrossglasscross-
off
cross-
off
cross-
off
ononcross-
on
cross-
on
onononcrossoffcross-
on
High Tide
/ height (m)
6:12PM
1.39
5:21AM
1.37
6:57PM
1.36
5:46AM
1.38
7:44PM
1.32
6:14AM
1.38
Low Tide
/ height (m)
11:48PM
0.63
12:07PM
-0.00
12:20AM
0.72
12:45PM
-0.03
12:52AM
0.81
1:25PM
-0.02
Sat
18
Sunday
19
Monday
20
Tuesday
21
Sunrise----5:05-------5:03-------5:03---
Sunset6:15-------6:16-------6:16-------
clear
clear
part cloud
clear
cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
part cloud
cloud
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
Rain (mm)
------------------------
Temp. °C171716161617191919171716161718181717171616171820
Feels °C (?)151616171616181717171715141516151414141212161418
  • 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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