Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 2 pm 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
19.0° C
(Which is 1.3°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 6PM is: 0.2m 10s primary swell from a East-southeast direction and 0.2m 6s secondary swell from a South-southeast direction (forecast issued at 02:00pm May 14). The wind direction is predicted to be glassy.

Time (JST) & DateWave HeightWave Period
Morning (14 May)--
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 23°C on Sun morning, min 14°C on Thu night). Wind will be generally light.

Thu
14
Friday
15
Saturday
16
Sun
17
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
12 AM
3 AM
6 AM
9 AM
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
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.2
ESE
10
0.2
ESE
10
0.2
ESE
10
0.3
SE
10
0.2
ESE
11
0.2
ESE
8
0.3
SE
8
0.2
SSE
8
0.2
SSE
6
0.2
ESE
8
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.3
SE
7
0.3
SE
7
0.3
SE
7
0.3
SE
7
0.4
SE
7
0.3
SE
10
0.5
SE
10
0.4
SE
8
0.4
SE
8
Wave Graph
Metric surfscale
Energy kJ
9
9
10
16
11
6
10
6
5
6
11
11
9
9
9
8
8
8
7
12
18
45
25
24
Wind (km/h)
15
E
15
SSE
0
S
25
NE
20
NNE
20
NE
20
NE
15
NE
10
NE
10
SE
10
S
10
ESE
5
NE
5
NE
10
NE
5
ENE
5
SSW
10
SSW
10
SSW
5
SW
5
WSW
10
NNW
5
NE
5
NE
cross-off
cross-on
glassy
cross-off
off
cross-off
cross-off
cross-off
cross-off
cross-on
cross-on
cross
cross-off
cross-off
off
cross-off
glassy
on
on
glassy
cross-on
cross-off
glassy
glassy
High Tide
3:50PM1.25m
3:10AM1.32m
4:42PM1.32m
3:39AM1.36m
5:29PM1.36m
4:08AM1.40m
Low Tide
9:17AM0.32m
9:25PM0.66m
9:56AM0.17m
10:08PM0.73m
10:34AM0.05m
10:46PM0.79m
clear
thunderstorm
thunderstorm
rain showers
rain showers
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
cloud
part cloud
part cloud
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:37
4:37
4:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:37
6:38
6:38
1
5
3
1
Temp °C
22
21
19
17
15
15
14
16
19
20
19
17
17
17
16
18
20
21
20
19
19
18
19
20
20
19
20
13
12
11
11
14
18
18
18
16
17
17
15
17
19
18
19
20
20
18
19
20
Swell 1
Height (m)
Direction
Period (s)
0.2
SSE
8
0.2
SSE
7
0.2
SSE
6
0.3
SE
10
0.2
ESE
4
0.2
ESE
8
0.3
SE
8
0.2
SSE
8
0.2
SSE
6
0.2
ESE
8
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.3
SE
7
0.3
SE
7
0.3
SE
7
0.3
SE
7
0.4
SE
7
0.4
SE
7
0.5
SE
10
0.4
SE
8
0.4
SE
8
Energy kJ
6
5
4
16
1
6
10
6
4
6
11
11
9
9
9
8
8
8
7
12
18
45
25
24
Swell 2
Height (m)
Direction
Period (s)
0.2
ESE
10
0.2
ESE
10
0.2
ESE
10
0.1
E
9
0.2
ESE
11
0.1
SE
11
0.1
SE
11
0.1
SE
11
0.1
SE
10
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
11
0.1
SE
10
0.2
SSE
10
0.3
SE
10
0.3
SE
10
0.2
SSE
10
Energy kJ
9
9
10
2
11
5
5
5
4
5
5
5
5
5
5
5
5
5
4
10
15
17
10
Swell 3
Height (m)
Direction
Period (s)
0.1
SE
10
0.1
SE
10
0.1
E
9
0.1
S
7
0.2
SSE
6
0.2
SSE
6
0.1
SE
12
0.1
SE
12
0.1
SE
12
0.1
S
7
0.1
S
7
0.1
S
7
0.1
S
6
0.1
S
6
0.1
S
6
0.1
S
6
0.1
E
10
0.1
SE
13
0.1
S
14
Energy kJ
4
4
2
1
4
4
6
6
5
1
1
1
1
1
1
1
2
7
4
Wind waves
Height (m)
Direction
Period (s)
0.4
ESE
3
0.3
NE
2
0.4
NE
3
0.4
NE
3
0.3
NE
3
0.3
SE
2
0.3
SE
3
Energy kJ
2
1
2
2
1
1
2
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
2
2
2
1
1
1
2
1
1
1
1
2
1
1
1
1
1
1
1
Distance (km)
38
64
38
145
38
51
51
38
16
16
64
38
38
38
51
16
16
18
38
16
16
16
38
16
Best forecast wave conditions in Kanagawa
Rating
(10 max)
1
1
1
1
2
1
1
1
2
1
1
1
1
1
1
Best forecast wave conditions in Japan
Rating
(10 max)
2
1
2
2
3
2
2
2
2
1
1
2
3
2
2
1
2
1
1
1
2
2
2
2
Header Global
Rating
(10 max)
9
5
4
5
5
5
5
5
6
5
5
5
5
5
5
5
5
5
4
5
7
5
6
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

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