Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 2 am Thursday 14 May 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
19.1° C
(Which is 1.1°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 5AM is: 0.4m 10s primary swell from a Southeast direction and 0.1m 10s secondary swell from a Southeast direction (forecast issued at 02:00am May 14). The wind direction is predicted to be glassy.

Time (JST) & DateWave HeightWave Period
Morning (14 May)1ft (0.3m)10s
Afternoon (14 May)0.5ft (0.2m)10s
Evening (14 May)1ft (0.3m)10s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 10mm), heaviest on Thu afternoon. Warm (max 22°C on Thu morning, min 14°C on Thu night). Wind will be generally light.

Thursday
14
Friday
15
Saturday
16
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
Rating
(10 max)
1
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
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.5
SE
10
0.4
SE
10
0.4
SE
10
0.3
ESE
10
0.2
ESE
10
0.2
ESE
10
0.2
ESE
10
0.3
SE
10
0.2
ESE
11
0.3
SE
11
0.3
SE
8
0.3
SE
9
0.1
SE
12
0.3
SE
8
0.2
ESE
8
0.2
ESE
8
0.4
SE
8
0.3
SE
8
0.3
SE
7
0.3
SE
7
0.3
ESE
9
0.4
SE
7
0.5
SE
7
0.5
SE
7
Wave Graph
Metric surfscale
Energy kJ
47
24
24
19
9
9
10
16
11
18
10
12
5
11
7
6
15
9
9
8
17
17
26
27
Wind (km/h)
10
NNE
5
NNE
5
NNE
10
ENE
10
E
20
SSE
5
SE
25
NE
25
NE
20
NE
25
NE
20
NE
20
NE
10
ENE
15
SE
10
E
5
NNE
10
NNE
15
NNE
15
NE
5
ENE
10
S
15
S
5
SSE
off
glassy
glassy
cross-off
cross-off
cross-on
cross
cross-off
off
off
off
off
off
cross-off
cross
cross-off
off
off
off
off
glassy
on
cross-on
glassy
High Tide
2:40AM1.28m
3:50PM1.25m
3:10AM1.32m
4:42PM1.32m
3:39AM1.36m
5:29PM1.36m
Low Tide
9:17AM0.32m
9:25PM0.66m
9:56AM0.17m
10:08PM0.73m
10:34AM0.05m
clear
part cloud
clear
clear
clear
clear
thunderstorm
light rain
rain showers
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:39
4:37
4:37
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:37
6:38
4
4
2
Temp °C
19
18
18
20
22
21
20
16
15
15
14
15
18
21
19
17
17
16
16
18
21
21
21
20
18
18
18
19
21
19
20
12
11
12
10
11
15
18
16
16
17
15
14
16
20
19
20
21
Swell 1
Height (m)
Direction
Period (s)
0.5
SE
10
0.4
SE
10
0.4
SE
10
0.3
ESE
10
0.2
SSE
8
0.2
SSE
7
0.2
SSE
6
0.3
SE
10
0.2
ESE
11
0.3
SE
11
0.3
SE
8
0.3
SE
9
0.1
SE
10
0.3
SE
8
0.2
ESE
8
0.2
ESE
8
0.4
SE
8
0.3
SE
8
0.3
SE
7
0.3
SE
7
0.3
SE
7
0.4
SE
7
0.5
SE
7
0.5
SE
7
Energy kJ
47
24
24
19
6
5
4
16
11
18
10
12
4
11
7
6
15
9
9
8
7
13
26
27
Swell 2
Height (m)
Direction
Period (s)
0.1
SE
11
0.1
SE
10
0.1
SE
10
0.2
SSE
8
0.2
ESE
10
0.2
ESE
10
0.2
ESE
10
0.1
E
9
0.2
ESE
4
0.2
SSE
6
0.1
SE
11
0.1
SE
11
0.1
SE
6
0.1
SE
11
0.1
SE
11
0.1
SE
11
0.1
SE
11
0.1
SE
11
0.1
SE
11
0.1
SE
11
0.1
SE
11
0.1
SE
10
0.2
SSE
10
0.3
SE
10
Energy kJ
5
4
4
6
9
9
10
2
1
4
5
5
2
5
5
5
5
5
5
5
5
4
9
14
Swell 3
Height (m)
Direction
Period (s)
0.1
S
9
0.1
S
7
0.1
SE
10
0.1
SE
10
0.1
SE
10
0.1
E
9
0.1
S
7
0.2
SSE
6
0.1
S
7
0.1
SE
12
0.1
SE
12
0.1
SE
12
0.1
S
7
0.1
S
7
0.1
S
7
0.3
ESE
9
0.3
ESE
9
0.2
E
9
0.1
E
10
Energy kJ
2
1
4
4
4
2
1
4
1
6
6
5
1
1
1
17
17
6
2
Wind waves
Height (m)
Direction
Period (s)
0.2
SSE
3
0.3
ESE
2
0.4
NE
3
0.4
NE
3
0.4
NE
3
0.4
NE
3
0.4
NE
3
0.2
ENE
2
0.3
ESE
2
0.3
ESE
4
Energy kJ
1
1
2
3
3
3
2
1
1
2
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
2
1
2
1
1
2
1
1
2
1
1
1
1
1
Distance (km)
18
16
38
38
38
16
16
64
38
38
145
145
145
487
2812
38
64
38
16
38
38
16
16
18
Best forecast wave conditions in Kanagawa
Rating
(10 max)
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
Best forecast wave conditions in Japan
Rating
(10 max)
2
3
2
2
2
2
2
1
2
2
2
3
2
2
2
1
2
2
3
3
2
1
2
Header Global
Rating
(10 max)
8
7
7
9
9
9
9
9
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
  • 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.


Nearest locationNearest
Nearest locationNearest
Nearest locationNearest