Rock Island surfForecast / Kanagawa / Japan

information circle48hr Weather and Surf, issued 8 am Thursday 07 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
20.3° C
(Which is slightly warmer than usual)

How big are the waves at Rock Island today?

The current surf forecast for Rock Island at 12PM is: 0.4m 10s primary swell from a East-southeast direction and 0.1m 11s secondary swell from a Southeast direction, 0.5m 6s secondary swell from a South-southeast direction (forecast issued at 08:00am May 07). The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (07 May)1.5ft (0.4m)6s
Afternoon (07 May)2.5ft (0.7m)6s
Evening (07 May)1.5ft (0.5m)6s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Warm (max 21°C on Thu afternoon, min 16°C on Sat night). Winds increasing (light winds from the S on Thu morning, strong winds from the SW by Fri night).

Thursday
7
Friday
8
Saturday
9
Sun
10
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
1
2
0
1
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)
0.4
SSE
6
0.4
SSE
6
0.4
ESE
10
0.7
SSE
6
0.4
SSE
6
0.5
SSE
6
1
S
6
0.9
S
6
0.7
S
6
0.7
S
6
1
S
6
1.4
SSW
6
1.6
SSW
6
1.7
SSW
7
1.6
SSW
7
2.1
SW
7
1.8
SW
7
0.9
SSW
7
0.5
SSW
7
0.3
SE
11
0.3
SE
11
0.3
SE
11
0.3
SE
11
0.3
SE
11
Wave Graph
Metric surfscale
Energy kJ
13
13
43
42
15
23
76
60
36
35
79
126
198
261
276
466
353
86
27
18
18
18
18
18
Wind (km/h)
5
SSW
5
S
15
S
20
S
20
SSW
25
SW
20
SW
15
SW
10
SW
20
SSW
25
SSW
40
SSW
40
SSW
45
SW
40
SW
10
W
10
SSW
10
SSE
10
E
15
NNE
10
WSW
10
NNW
10
NNE
10
E
on
cross-on
on
on
on
on
on
on
on
on
on
on
on
on
cross-on
cross-on
on
cross-on
cross-off
off
cross-on
cross-off
off
cross-off
High Tide
6:48AM1.34m
10:01PM1.22m
7:30AM1.26m
11:05PM1.19m
8:28AM1.17m
00:05AM1.19m
Low Tide
2:24PM0.05m
2:34AM0.99m
3:16PM0.16m
3:50AM0.99m
4:16PM0.27m
clear
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
clear
part cloud
cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
part cloud
cloud
part cloud
part cloud
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:45
4:43
4:43
4:41
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:30
6:31
6:32
6:34
Temp °C
17
18
19
19
21
20
19
19
19
20
20
21
21
20
20
18
18
18
19
21
19
19
18
17
17
18
18
18
19
18
17
19
19
19
18
16
16
13
13
16
16
16
16
16
16
16
15
13
Swell 1
Height (m)
Direction
Period (s)
0.4
SSE
6
0.4
SSE
6
0.1
SE
11
0.1
SE
11
0.4
SSE
6
0.5
SSE
6
0.1
SE
11
0.9
S
6
0.7
S
6
0.3
SE
11
0.3
SE
11
0.3
SE
11
0.2
ESE
11
0.1
SE
11
0.1
SE
11
1.5
SSW
7
1.2
SSW
8
0.9
SSW
7
0.5
SSW
7
0.3
SSW
5
0.3
SSW
4
0.3
SSW
6
0.3
SSW
6
0.3
SE
11
Energy kJ
13
13
4
4
15
23
4
60
36
18
18
18
12
5
5
222
161
86
27
5
4
8
8
18
Swell 2
Height (m)
Direction
Period (s)
0.1
SE
11
0.1
SE
11
0.4
ESE
10
0.4
ESE
10
0.1
SE
11
0.2
ESE
11
0.2
ESE
11
0.2
ESE
11
0.2
ESE
11
0.2
ESE
11
0.3
SE
11
0.3
SE
11
0.3
SW
8
0.3
SE
11
0.3
SE
11
0.3
SE
11
0.2
SSW
6
Energy kJ
4
4
43
42
4
11
11
11
12
11
18
18
10
18
18
18
4
Swell 3
Height (m)
Direction
Period (s)
0.2
SSW
8
0.3
SE
11
0.2
S
7
0.1
SW
8
0.1
SW
8
0.1
SW
8
Energy kJ
7
18
4
3
3
2
Wind waves
Height (m)
Direction
Period (s)
0.5
SSE
6
0.7
SSE
6
0.6
S
4
0.7
SSW
4
1
S
6
0.6
SW
6
0.7
S
6
1
S
6
1.4
SSW
6
1.6
SSW
6
1.7
SSW
7
1.6
SSW
7
2.1
SW
7
1.8
SW
7
0.3
NE
2
0.2
ENE
2
Energy kJ
22
40
9
17
76
29
35
79
126
198
261
276
466
353
1
1
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
2
1
1
1
1
1
1
1
Distance (km)
18
76
76
76
38
38
14
14
27
90
518
470
487
487
487
10
14
14
0
38
16
38
38
51
Best forecast wave conditions in Kanagawa
Rating
(10 max)
1
1
1
1
1
1
3
2
4
2
1
Best forecast wave conditions in Japan
Rating
(10 max)
1
1
1
1
1
1
1
1
1
2
1
2
2
1
1
3
3
4
4
3
2
2
2
1
Header Global
Rating
(10 max)
5
6
6
5
7
5
5
5
7
7
6
7
6
5
6
7
9
6
5
5
5
4
9
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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