Niyodo Rivermouth surfForecast / Shikoku / Japan

information circle48hr Weather and Surf, issued 2 am Monday 04 May 2026 JST
Forecast update in hr  min  s Forecast update imminent
Niyodo Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Niyodo Rivermouth sea temperature is
21.1° C
(Which is 1.0°C warmer than normal for this time of year)

How big are the waves at Niyodo Rivermouth today?

The current surf forecast for Niyodo Rivermouth at 7AM is: 2.0m 8s primary swell from a South-southwest direction and 0.4m 10s secondary swell from a East-southeast direction (forecast issued at 02:00am May 04). An open ocean swell of 1.0m 4s is not directed at the surf break. The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (04 May)6ft (1.8m)8s
Afternoon (04 May)4.5ft (1.3m)8s
Evening (04 May)3.5ft (1.1m)7s

Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Warm (max 20°C on Wed morning, min 13°C on Mon night). Winds decreasing (fresh winds from the WNW on Mon morning, calm by Wed afternoon).

Monday
4
Tuesday
5
Wednesday
6
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
6 PM
9 PM
Rating
(10 max)
!
!
1
0
0
1
0
1
1
1
1
0
0
0
1
1
1
1
1
1
0
0
1
1
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>
Wave
Height (m)
Direction
Period (s)
3.5
SSW
9
3
SSW
9
2.1
SSW
8
1.8
SSW
8
1.5
SSW
8
1.3
SSW
8
1.1
SSW
8
1.1
SW
7
0.7
SSW
7
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.6
ESE
10
0.6
ESE
10
0.6
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
SE
10
Wave Graph
Metric surfscale
Energy kJ
1717
1515
618
414
298
202
142
121
46
42
42
42
41
58
58
57
65
64
63
83
81
81
80
92
Wind (km/h)
15
SW
15
W
15
W
20
W
30
WNW
20
WNW
15
NW
5
WNW
10
N
10
NNW
10
N
5
SE
10
SSE
10
S
5
S
5
NE
10
NNE
10
NNE
5
NNE
5
ESE
10
SSE
10
SSE
0
N
10
N
cross-on
cross
cross
cross
cross-off
cross-off
cross-off
cross-off
off
cross-off
off
cross-on
on
on
glassy
cross-off
off
off
off
glassy
on
on
glassy
off
High Tide
6:27AM1.73m
7:55PM1.66m
6:53AM1.69m
8:33PM1.57m
7:21AM1.64m
Low Tide
00:51AM0.86m
1:11PM0.20m
1:19AM0.93m
1:44PM0.26m
1:49AM1.00m
2:21PM0.34m
mod rain
light rain
part cloud
cloud
part cloud
part cloud
cloud
cloud
part cloud
cloud
part cloud
clear
clear
part cloud
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:13
5:13
5:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:49
6:50
6:51
7
1
Temp °C
21
20
17
19
19
18
17
15
13
13
13
17
18
18
17
15
14
14
14
18
20
20
19
16
22
20
15
15
11
12
13
13
11
11
11
15
15
16
16
14
12
12
12
17
18
19
20
15
Swell 1
Height (m)
Direction
Period (s)
0.4
ESE
10
2.5
SSW
9
2.1
SSW
8
1.8
SSW
8
1.5
SSW
8
1.3
SSW
8
1.1
SSW
8
1.1
SW
7
0.7
SSW
7
0.5
SW
7
0.4
ESE
10
0.5
S
6
0.4
ESE
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.6
ESE
10
0.6
ESE
10
0.6
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
ESE
10
0.7
SE
10
Energy kJ
38
1159
618
414
298
202
142
121
46
25
42
21
41
58
58
57
65
64
63
83
81
81
80
92
Swell 2
Height (m)
Direction
Period (s)
0.2
E
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.4
SW
7
0.4
ESE
10
0.3
SSE
6
0.4
S
6
0.3
S
6
0.3
S
6
0.2
S
5
0.2
S
5
0.2
S
5
0.2
S
5
0.2
SSE
3
Energy kJ
7
38
38
38
38
37
38
38
41
42
11
42
7
11
6
6
2
2
2
2
1
Swell 3
Height (m)
Direction
Period (s)
0.3
SE
7
0.3
SE
8
0.4
SE
7
0.3
SSE
7
0.4
SSE
6
0.3
SSW
6
0.3
SW
6
0.1
S
5
0.1
SW
6
0.2
E
3
Energy kJ
9
9
14
9
13
8
6
1
2
1
Wind waves
Height (m)
Direction
Period (s)
3.5
SSW
9
3
SSW
9
1
W
4
1.1
W
4
1.3
W
5
1.3
WNW
5
0.9
WNW
4
0.4
NW
4
0.4
W
4
0.3
W
3
0.3
WNW
3
0.2
E
3
0.3
E
6
0.2
ESE
3
Energy kJ
1717
1515
37
46
81
78
36
7
4
2
2
1
7
1
Nearest Offshore or Glassy
Rating
(10 max)
2
5
3
2
2
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Distance (km)
183
82
55
55
82
65
55
0
0
0
0
55
330
51
0
0
0
0
0
0
432
432
0
0
Best forecast wave conditions in Shikoku
Rating
(10 max)
5
4
4
4
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Best forecast wave conditions in Japan
Rating
(10 max)
3
5
4
4
4
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Header Global
Rating
(10 max)
5
4
4
4
4
4
5
5
5
5
5
4
5
5
5
5
5
5
5
5
5
5
8
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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