Niyodo Rivermouth surfForecast / Shikoku / Japan

information circle48hr Weather and Surf, issued 2 am Sunday 31 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
23.1° C
(Which is 1.1°C warmer than normal for this time of year)

How big are the waves at Niyodo Rivermouth today (31 May):

  • Morning surf: Morning surf (31 May, local time) - 3ft (0.9m), 14s period with S swell.
  • Afternoon surf: Afternoon surf (31 May, local time) - 4ft (1.2m), 12s period with S swell.
  • Evening surf: Evening surf (31 May, local time) - 4.5ft (1.3m), 12s period with S swell.

The current surf forecast for Niyodo Rivermouth at 7AM is: 0.8m 14s primary swell from a South direction and 0.8m 11s secondary swell from a East-southeast direction (forecast issued at 02:00am May 31). The wind direction is predicted to be glassy and the swell rating is 2.

Time (JST) & DateWave HeightWave Period
Morning (31 May)3ft (0.9m)14s
Afternoon (31 May)4ft (1.2m)12s
Evening (31 May)4.5ft (1.3m)12s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Heavy rain (total 154mm), heaviest during Tue night. Warm (max 26°C on Sun afternoon, min 19°C on Sun night). Winds increasing (calm on Sun morning, near gales from the ENE by Tue night).

Sunday
31
Monday
1
Tuesday
2
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
2
2
2
2
3
1
2
2
3
3
4
2
2
3
4
3
4
4
3
3
3
2
0
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.6
E
11
0.5
S
16
0.7
S
14
0.9
S
14
1.1
S
13
1.2
S
12
1.3
S
12
1.3
S
12
0.9
S
16
1.2
S
15
1.1
S
14
2.1
S
14
2.1
S
13
2.1
S
13
2.1
S
14
2.2
S
14
2.3
S
14
2.4
S
14
2.4
S
13
2.5
S
14
2.3
SSW
14
2.3
SSW
14
2.2
SSW
14
2.4
SSW
14
Wave Graph
Metric surfscale
Energy kJ
88
124
203
293
398
439
488
480
386
648
482
1638
1556
1553
1579
1759
1894
2073
2060
2299
2048
2048
1733
2342
Wind (km/h)
5
N
5
N
0
NNE
0
SSW
5
S
5
SSW
15
S
10
SSE
5
S
5
NE
5
NE
5
SSE
15
S
15
SSE
5
SSE
5
SSE
5
SSE
5
NE
5
ENE
10
E
10
E
10
ESE
25
ESE
35
E
off
glassy
glassy
glassy
glassy
glassy
on
on
on
glassy
glassy
glassy
on
on
on
glassy
cross-on
glassy
glassy
cross
cross
cross
cross
cross
High Tide
5:02AM1.68m
6:40PM1.69m
5:34AM1.69m
7:15PM1.68m
6:07AM1.69m
7:51PM1.65m
Low Tide
11:33PM0.93m
11:50AM0.19m
00:06AM0.95m
12:24PM0.17m
00:38AM0.97m
12:59PM0.19m
cloud
cloud
cloud
cloud
cloud
clear
clear
cloud
part cloud
part cloud
clear
clear
clear
part cloud
light rain
light rain
mod rain
light rain
light rain
light rain
mod rain
mod rain
heavy rain
heavy rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:56
4:56
4:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:08
7:08
7:09
1
3
8
5
5
3
10
9
11
17
Temp °C
21
21
21
24
24
26
24
21
20
20
19
22
23
23
21
20
19
19
19
20
20
21
21
21
23
23
23
27
25
27
24
23
22
23
21
24
23
23
23
23
21
21
21
21
21
23
20
18
Swell 1
Height (m)
Direction
Period (s)
0.6
E
11
0.7
ESE
11
0.7
S
14
0.9
S
14
1.1
S
13
1.2
S
12
1.3
S
12
1.3
S
12
1.2
S
12
1.2
S
15
1.2
SSE
6
2.1
S
14
2.1
S
13
2.1
S
13
2.1
S
14
2.2
S
14
2.3
S
14
2.4
S
14
2.4
S
13
2.5
S
14
2.3
SSW
14
2.3
SSW
14
2.2
SSW
14
2.4
SSW
14
Energy kJ
88
105
203
293
398
439
488
480
384
648
109
1638
1556
1553
1579
1759
1894
2073
2060
2299
2048
2048
1733
2342
Swell 2
Height (m)
Direction
Period (s)
0.3
SSE
5
0.5
S
16
0.8
ESE
11
0.8
ESE
11
0.6
ESE
11
0.6
E
11
0.6
E
11
0.7
S
16
0.9
S
16
1.1
SSE
11
1.1
S
14
0.5
E
10
0.5
ESE
10
0.5
E
10
0.5
E
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.4
E
10
0.3
SE
12
0.4
S
10
Energy kJ
5
124
135
135
91
85
85
245
386
297
482
55
60
50
53
58
58
58
30
23
31
Swell 3
Height (m)
Direction
Period (s)
0.2
S
16
0.1
SE
9
0.3
SSE
9
0.2
SSE
9
0.2
SSE
9
0.1
SE
9
0.3
SE
12
0.6
ESE
11
0.5
E
10
0.9
SSE
5
1
S
11
0.5
E
10
0.3
SE
11
0.5
E
10
0.3
SE
11
0.3
SE
12
0.3
SE
12
Energy kJ
20
3
15
8
8
3
22
90
52
42
231
51
19
52
20
22
23
Wind waves
Height (m)
Direction
Period (s)
0.6
S
4
0.8
SSE
5
1.2
ESE
6
0.4
ESE
10
1.4
SE
5
2
ESE
6
2.5
ESE
7
3.5
ESE
8
Energy kJ
11
29
87
31
115
295
652
1692
Nearest Offshore or Glassy
Rating
(10 max)
1
2
2
2
2
3
3
3
3
3
3
4
1
4
4
4
4
4
4
4
4
4
4
4
Distance (km)
0
0
0
0
0
0
283
51
51
0
0
0
380
58
58
0
29
0
0
29
29
432
432
432
Best forecast wave conditions in Shikoku
Rating
(10 max)
1
2
2
2
2
3
3
3
3
3
4
4
4
4
4
4
4
4
4
Best forecast wave conditions in Japan
Rating
(10 max)
1
2
2
2
2
3
3
4
3
3
3
4
2
4
4
4
4
4
4
4
4
4
4
4
Header Global
Rating
(10 max)
6
8
7
7
7
7
7
6
6
5
5
5
5
5
5
4
4
4
5
5
5
5
7
6
  • 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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