Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 am Sunday 10 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
20.7° C
(Which is slightly warmer than usual)

How big are the waves at Rock Island today?

The current surf forecast for Rock Island at 3PM is: 0.6m 6s primary swell from a South-southeast direction and 0.2m 9s secondary swell from a East-southeast direction, 0.1m 6s secondary swell from a West direction (forecast issued at 08:00am May 10). The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (10 May)1ft (0.3m)10s
Afternoon (10 May)2ft (0.6m)6s
Evening (10 May)3.5ft (1.1m)7s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Light rain (total 3mm), mostly falling on Sun night. Very mild (max 19°C on Mon afternoon, min 16°C on Tue night). Winds decreasing (fresh winds from the S on Mon afternoon, calm by Tue night).

Sunday
10
Monday
11
Tuesday
12
Wed
13
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
12 AM
3 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
1
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)
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.6
SSE
6
0.8
SSE
6
1.1
SE
7
0.8
SSE
6
0.9
SSE
6
0.8
S
6
0.7
S
5
0.7
S
5
0.8
S
4
0.8
S
4
0.5
SE
10
0.6
SSE
8
0.8
SSE
9
0.7
SSE
9
0.6
SSE
9
0.6
SE
9
0.6
SE
9
0.5
SE
9
0.5
SE
9
0.5
SE
9
0.5
SE
11
Wave Graph
Metric surfscale
Energy kJ
17
16
15
22
51
100
47
56
39
29
26
20
21
51
47
86
68
50
67
50
39
41
42
56
Wind (km/h)
20
NE
15
NE
20
SE
25
S
20
SSE
20
SSE
25
S
25
S
25
SSW
25
SSW
30
S
30
S
30
S
25
S
25
SSW
20
SSW
15
SSW
15
SSW
20
S
20
S
20
S
10
SSE
5
S
0
NE
off
cross-off
cross-on
cross-on
cross-on
cross-on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
cross-on
cross-on
glassy
High Tide
9:58AM1.08m
00:56AM1.20m
11:56AM1.05m
1:36AM1.22m
1:36PM1.09m
2:10AM1.25m
Low Tide
5:29AM0.93m
5:26PM0.37m
6:54AM0.81m
6:38PM0.46m
7:52AM0.65m
7:43PM0.53m
clear
part cloud
clear
clear
clear
part cloud
rain showers
rain showers
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:41
4:41
4:39
4:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:34
6:35
6:35
6:36
1
1
1
Temp °C
16
18
18
18
18
18
18
18
17
18
18
19
18
18
17
17
17
18
18
18
18
17
17
17
11
13
14
13
14
15
14
14
13
14
13
14
12
14
13
14
15
16
15
14
15
15
16
18
Swell 1
Height (m)
Direction
Period (s)
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.2
ESE
9
0.3
SE
9
0.8
SSE
7
0.1
SE
9
0.1
SE
9
0.1
SE
9
0.1
SE
11
0.3
SE
11
0.2
ESE
11
0.2
SSE
7
0.5
SE
8
0.6
SSE
8
0.8
SSE
9
0.7
SSE
9
0.6
SSE
9
0.6
SE
9
0.6
SE
9
0.5
SE
9
0.5
SE
9
0.5
SE
9
0.5
SE
11
Energy kJ
17
16
15
9
13
50
3
3
3
4
18
11
5
31
47
86
68
50
67
50
39
41
42
56
Swell 2
Height (m)
Direction
Period (s)
0.2
S
3
0.2
S
3
0.1
S
6
0.1
W
6
0.1
SE
11
0.1
SE
8
0.1
SE
11
0.1
SE
11
0.1
SE
11
0.1
SE
8
0.2
ESE
10
0.5
SE
10
Energy kJ
1
1
1
1
5
3
5
5
5
3
11
51
Swell 3
Height (m)
Direction
Period (s)
0.2
S
6
0.1
S
6
0.1
W
6
0.1
SE
11
Energy kJ
3
1
1
5
Wind waves
Height (m)
Direction
Period (s)
0.4
SE
2
0.6
SSE
6
0.8
SSE
6
1.1
SE
7
0.8
SSE
6
0.9
SSE
6
0.8
S
6
0.7
S
5
0.7
S
5
0.8
S
4
0.8
S
4
0.6
S
4
0.5
S
3
0.3
S
2
0.3
S
3
0.3
SSE
3
Energy kJ
2
22
51
100
47
56
39
29
26
20
21
11
6
1
1
2
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
Distance (km)
38
145
64
470
491
77
77
77
76
77
77
77
77
77
38
14
14
18
64
64
64
38
38
0
Best forecast wave conditions in Kanagawa
Rating
(10 max)
1
1
1
1
1
1
1
1
Best forecast wave conditions in Japan
Rating
(10 max)
2
1
1
2
1
1
1
2
1
1
1
1
2
1
2
2
2
2
1
1
1
2
2
2
Header Global
Rating
(10 max)
4
4
4
4
5
9
9
8
6
9
5
5
4
5
4
8
9
6
9
9
9
9
9
9
  • 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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