Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 pm Sunday 03 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 normal for this time of year)

How big are the waves at Rock Island today?

The current surf forecast for Rock Island at 11PM is: 1.8m 6s primary swell from a South-southwest direction and 0.4m 9s secondary swell from a East-southeast direction (forecast issued at 08:00pm May 03). The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (03 May)--
Afternoon (03 May)--
Evening (03 May)5ft (1.6m)6s

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 5mm), mostly falling on Sun night. Warm (max 22°C on Mon morning, min 15°C on Mon night). Winds decreasing (gales from the SW on Mon afternoon, calm by Tue morning).

Sun
3
Monday
4
Tuesday
5
Wednesday
6
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
12 PM
3 PM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
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)
1.5
SSW
5
1.6
SSW
6
1.9
SSW
6
2.4
S
7
3
SSW
8
2.5
SSW
9
2.5
SSW
8
2.3
SSW
7
2.3
SSW
7
1.3
SSW
8
1.3
SSW
8
0.9
SSW
9
0.5
SW
9
0.5
SSW
8
0.3
SW
9
0.5
S
7
0.7
S
4
0.5
S
4
0.5
S
3
0.4
S
4
0.4
SE
6
0.4
SSE
6
0.4
SE
9
0.4
SSE
6
Wave Graph
Metric surfscale
Energy kJ
133
159
284
537
1221
1098
824
473
459
246
239
140
41
41
12
23
13
7
6
4
8
10
22
10
Wind (km/h)
45
SSW
40
SSW
50
SSW
55
SSW
60
SW
45
SW
50
SW
65
SW
60
SW
15
W
30
NNE
30
NNE
25
N
0
NE
15
S
25
S
25
S
25
S
20
SSW
15
SW
10
WSW
10
SSW
15
SSW
20
S
on
on
on
on
on
on
on
cross-on
on
cross-on
off
off
off
glassy
cross-on
on
cross-on
on
on
cross-on
cross-on
on
on
on
High Tide
6:36PM1.38m
5:12AM1.40m
7:22PM1.35m
5:42AM1.40m
8:10PM1.31m
6:13AM1.38m
Low Tide
11:51PM0.79m
12:16PM-0.07m
00:25AM0.86m
12:56PM-0.07m
1:01AM0.92m
1:38PM-0.02m
part cloud
cloud
cloud
light rain
light rain
part cloud
clear
part cloud
part cloud
cloud
part cloud
cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
part cloud
part cloud
cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:48
4:47
4:46
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:28
6:29
6:30
6:30
3
2
Temp °C
20
19
19
19
21
21
22
22
20
19
16
15
15
16
16
17
16
17
17
16
17
17
18
18
13
13
12
11
12
14
13
9
8
15
9
8
9
14
12
11
10
12
13
13
15
15
16
15
Swell 1
Height (m)
Direction
Period (s)
0.2
ESE
10
0.4
ESE
9
0.4
ESE
9
0.4
SE
10
0.3
ESE
9
0.3
ESE
10
0.3
ESE
10
0.3
ESE
10
0.3
ESE
10
1.3
SSW
8
1.3
SSW
8
0.9
SSW
9
0.5
S
7
0.5
SSW
8
0.3
S
7
0.2
SSW
8
0.2
SSW
8
0.2
S
7
0.2
S
7
0.2
SSE
6
0.4
SE
6
0.4
SSE
6
0.2
ESE
11
0.1
SE
9
Energy kJ
10
35
35
23
17
19
19
20
21
246
239
140
26
41
8
7
6
4
3
4
8
10
11
3
Swell 2
Height (m)
Direction
Period (s)
0.4
SE
10
0.1
SE
11
0.5
SW
9
0.1
SE
11
0.3
SW
9
0.1
SE
11
0.1
SE
10
0.1
SE
10
0.1
SE
10
0.1
SE
11
0.3
S
4
0.1
SE
11
0.4
SE
9
0.1
SE
11
Energy kJ
28
5
41
5
12
4
4
4
4
4
3
4
22
5
Swell 3
Height (m)
Direction
Period (s)
0.1
SE
11
0.1
E
10
0.3
SSE
7
0.1
SW
8
0.1
SW
8
0.1
SW
7
0.1
SE
11
0.1
SE
11
0.1
SE
11
0.1
SW
6
Energy kJ
5
2
9
2
2
2
4
5
5
2
Wind waves
Height (m)
Direction
Period (s)
1.5
SSW
5
1.6
SSW
6
1.9
SSW
6
2.4
S
7
3
SSW
8
2.5
SSW
9
2.5
SSW
8
2.3
SSW
7
2.3
SSW
7
1.1
SW
7
0.3
NE
2
0.4
NNE
3
0.3
NNE
3
0.5
S
7
0.7
S
4
0.5
S
4
0.5
S
3
0.4
S
4
0.4
SSE
6
0.4
SSE
6
Energy kJ
133
159
284
537
1221
1098
824
473
459
111
1
3
1
23
13
7
6
4
10
10
Nearest Offshore or Glassy
Rating
(10 max)
1
4
2
4
3
4
2
2
1
2
4
1
1
2
1
1
1
1
1
1
1
1
1
1
Distance (km)
2037
755
755
491
470
470
470
509
487
10
38
8
0
16
16
64
534
77
145
18
18
18
77
77
Best forecast wave conditions in Kanagawa
Rating
(10 max)
2
1
1
2
1
1
1
1
Best forecast wave conditions in Japan
Rating
(10 max)
4
3
4
4
4
2
2
1
2
4
2
2
2
2
1
1
1
1
1
1
1
2
1
Header Global
Rating
(10 max)
4
4
5
4
4
4
4
4
5
5
5
5
5
4
5
5
5
5
5
4
6
5
5
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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