Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 2 pm Thursday 30 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
19.8° C
(Which is slightly warmer than usual)

How big are the waves at Rock Island today?

The current surf forecast for Rock Island at 10PM is: 0.4m 7s primary swell from a Southeast direction and 0.1m 10s secondary swell from a Southeast direction (forecast issued at 02:00pm April 30). The wind direction is predicted to be offshore.

Time (JST) & DateWave HeightWave Period
Morning (30 Apr)--
Afternoon (30 Apr)1ft (0.3m)8s
Evening (30 Apr)1ft (0.3m)7s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Heavy rain (total 38mm), heaviest during Fri morning. Very mild (max 19°C on Sat afternoon, min 11°C on Thu night). Winds decreasing (near gales from the SW on Fri night, calm by Sat night).

Thu
30
Friday
1
Saturday
2
Sun
3
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
2
1
0
0
0
0
2
0
0
0
0
0
0
0
0
0
Swell
Height Map
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span><span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span><span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span><span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span><span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span><span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span><span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span><span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span><span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
Wave
Height (m)
Direction
Period (s)
0.2
ESE
5
0.3
SE
8
0.6
ESE
6
0.3
SE
7
0.5
SE
7
0.9
SSE
7
1
SSE
7
1.2
SSE
8
1.3
SSE
8
1.4
SSW
8
2
SSW
8
2.5
SSW
8
2.2
SSW
8
2.5
SW
10
1.3
SSW
10
1
SSW
10
0.8
SSW
10
0.5
SW
10
0.4
SW
10
0.4
S
7
0.4
SW
8
0.4
SW
8
0.3
SSW
7
0.3
S
7
Wave Graph
Metric surfscale
Energy kJ
2
9
21
8
25
75
101
171
207
277
534
936
627
1108
331
202
123
50
23
15
18
15
10
8
Wind (km/h)
15
ENE
15
NNE
15
NNE
20
NNE
30
N
35
N
30
N
35
N
5
NNW
10
SSE
30
SSW
50
SW
35
WSW
35
WSW
15
NNE
10
WSW
30
S
20
SSE
10
SSE
5
ESE
10
NE
15
NNE
20
N
10
N
cross-off
off
off
off
off
cross-off
off
off
cross-off
cross-on
on
cross-on
cross-on
cross-on
off
cross-on
on
cross-on
cross-on
glassy
off
off
cross-off
cross-off
High Tide
4:17PM1.30m
3:52AM1.32m
5:05PM1.35m
4:18AM1.35m
5:51PM1.38m
4:45AM1.38m
Low Tide
9:51AM0.30m
10:05PM0.56m
10:27AM0.16m
10:43PM0.63m
11:03AM0.04m
11:18PM0.71m
light rain
light rain
cloud
light rain
light rain
light rain
mod rain
heavy rain
mod rain
light rain
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:50
4:50
4:48
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:25
6:25
6:27
6:28
1
1
1
4
3
7
13
7
2
Temp °C
14
13
14
14
12
11
11
12
15
15
18
17
16
15
15
17
18
19
19
19
18
18
17
18
10
10
10
10
6
4
5
6
15
15
14
8
9
9
12
15
12
15
18
19
17
16
13
16
Swell 1
Height (m)
Direction
Period (s)
0.2
ESE
5
0.3
SE
8
0.3
SE
6
0.3
SE
7
0.5
SE
7
0.9
SSE
7
1
SSE
7
1.2
SSE
8
1.3
SSE
8
1.2
SSE
9
0.9
SE
9
0.7
SE
9
1.7
SSW
8
1.3
SSW
10
1
SSW
10
0.8
SSW
10
0.5
S
8
0.4
S
7
0.4
S
7
0.4
SW
8
0.4
SW
8
0.3
SSW
7
0.3
S
7
Energy kJ
2
9
5
8
25
75
101
171
207
207
123
86
361
331
202
123
30
16
15
18
15
9
8
Swell 2
Height (m)
Direction
Period (s)
0.1
SE
8
0.1
S
5
0.1
SE
9
0.1
SE
10
0.4
N
3
0.3
N
3
0.4
SSE
8
0.1
SE
10
0.3
SE
8
0.4
SE
8
0.5
SW
10
0.4
SW
10
0.3
SW
9
0.2
S
7
0.2
ESE
10
0.2
ESE
10
0.1
SW
7
Energy kJ
2
1
3
4
4
2
26
4
9
15
50
23
13
4
9
10
2
Swell 3
Height (m)
Direction
Period (s)
0.1
S
6
0.1
SE
9
0.1
S
5
0.1
S
5
0.1
SE
10
0.1
SE
11
0.3
E
9
0.1
SE
9
0.1
SE
9
0.1
SE
9
0.2
S
7
0.2
S
7
0.1
SE
8
Energy kJ
1
3
1
1
4
4
14
3
3
3
4
4
3
Wind waves
Height (m)
Direction
Period (s)
0.6
ESE
6
0.2
NNE
2
0.5
N
3
0.4
N
3
0.5
N
3
1.4
SSW
8
2
SSW
8
2.5
SSW
8
2.2
SSW
8
2.5
SW
10
Energy kJ
21
1
4
3
5
277
534
936
627
1108
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
2
1
2
1
2
2
2
1
1
1
2
1
1
1
1
2
1
2
1
1
Distance (km)
38
38
794
854
755
17
491
17
0
491
487
487
487
487
0
14
76
136
64
16
38
54
54
16
Best forecast wave conditions in Kanagawa
Rating
(10 max)
1
2
2
2
3
2
1
Best forecast wave conditions in Japan
Rating
(10 max)
2
1
1
2
2
4
4
4
4
2
2
1
1
1
4
4
2
1
3
2
2
2
1
1
Header Global
Rating
(10 max)
5
5
5
5
5
6
6
6
7
7
7
6
5
5
9
9
5
5
5
4
4
4
4
4
  • 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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