Niyodo Rivermouth surfForecast / Shikoku / Japan

information circle48hr Weather and Surf, issued 8 pm 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
23.7° C
(Which is 1.7°C warmer than normal for this time of year)

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

  • Evening surf: Evening surf (31 May, local time) - 4ft (1.2m), 12s period with S swell.

The current surf forecast for Niyodo Rivermouth at 11PM is: 0.9m 16s primary swell from a South direction and 1.4m 7s secondary swell from a South-southeast direction, 1.2m 12s secondary swell from a South direction, 1.2m 6s secondary swell from a South-southeast direction (forecast issued at 08:00pm May 31). The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (31 May)--
Afternoon (31 May)--
Evening (31 May)4ft (1.2m)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 109mm), heaviest during Tue night. Warm (max 26°C on Wed afternoon, min 19°C on Mon night). Winds increasing (calm on Sun night, fresh winds from the NE by Tue night).

Sun
31
Monday
1
Tuesday
2
Wednesday
3
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)
1
1
2
3
3
4
2
3
3
3
4
4
3
4
4
4
3
2
!
!
!
!
!
4
Swell
Height Map
Height MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
1.3
S
12
1.2
S
12
0.9
S
16
1.1
S
15
1.1
S
14
1.8
S
14
1.7
S
13
2.2
S
14
2.3
S
14
2.4
S
14
2.4
S
14
2.4
S
14
2.5
S
13
2.2
SSW
13
2.2
SSW
13
2.2
SSW
14
2.3
SSW
14
2.5
SSW
14
3.5
SSW
15
5.5
SSW
15
5.5
S
14
4.5
S
13
3
SSW
12
2.3
SE
10
Wave Graph
Metric surfscale
Energy kJ
488
411
386
559
482
1196
986
1733
2019
2379
2293
2073
2135
1605
1649
1886
1987
2452
5085
12013
11501
6436
2815
1081
Wind (km/h)
15
S
10
S
10
S
0
WSW
5
NE
5
SE
10
SSE
10
S
10
SE
5
ESE
5
SE
5
E
5
E
10
ENE
10
ENE
10
ENE
20
E
25
E
30
ENE
35
NE
30
NNW
25
NNW
20
NW
15
NNW
on
on
on
glassy
glassy
glassy
on
on
cross-on
cross
glassy
cross-off
cross
cross-off
cross-off
cross-off
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
off
High Tide
6:40PM1.69m
5:34AM1.69m
7:15PM1.68m
6:07AM1.69m
7:51PM1.65m
6:40AM1.68m
Low Tide
00:06AM0.95m
12:24PM0.17m
00:38AM0.97m
12:59PM0.19m
1:11AM0.98m
1:35PM0.23m
clear
light rain
light rain
part cloud
part cloud
clear
clear
part cloud
cloud
cloud
light rain
light rain
light rain
light rain
light rain
light rain
mod rain
heavy rain
heavy rain
heavy rain
rain showers
cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:56
4:56
4:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:08
7:08
7:09
7:09
1
1
3
4
4
5
4
5
9
17
21
32
3
Temp °C
24
21
20
20
20
22
23
23
22
21
20
19
19
20
20
21
22
22
22
23
22
23
25
26
24
22
21
23
22
24
23
24
23
23
23
21
21
22
21
22
22
21
20
20
20
21
24
27
Swell 1
Height (m)
Direction
Period (s)
1.3
S
12
1.2
S
12
1.4
SSE
7
1.3
SSE
7
1.2
SSE
7
1.8
S
14
1.7
S
13
2.2
S
14
2.3
S
14
2.4
S
14
2.4
S
14
2.4
S
14
2.5
S
13
2.2
SSW
13
2.2
SSW
13
2.2
SSW
14
2.3
SSW
14
2.5
SSW
14
3.5
SSW
15
5.5
SSW
15
5.5
S
14
4.5
S
13
3
SSW
12
2.3
SE
10
Energy kJ
488
411
175
163
116
1196
986
1733
2019
2379
2293
2073
2135
1605
1649
1886
1987
2452
4969
12013
11501
6436
2815
1081
Swell 2
Height (m)
Direction
Period (s)
0.6
E
11
0.7
S
16
1.2
S
12
1.1
S
15
1.1
S
14
0.6
SSE
6
1
SSW
16
0.5
E
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.3
SE
12
0.3
SE
12
4
SE
11
5
ESE
11
4
ESE
11
3
ESE
11
2
SSW
11
Energy kJ
83
245
384
559
482
28
540
53
59
59
58
58
22
23
4206
5590
3366
1843
994
Swell 3
Height (m)
Direction
Period (s)
0.3
SE
12
0.6
E
11
0.9
S
16
1
S
11
1
S
11
0.6
ESE
6
0.5
E
10
0.6
E
10
0.3
SE
12
1.3
NE
8
0.6
NE
8
Energy kJ
22
85
386
242
231
31
54
74
21
222
36
Wind waves
Height (m)
Direction
Period (s)
0.6
S
4
1.2
SSE
6
0.8
ESE
5
0.6
E
10
0.4
ESE
10
1.8
ESE
6
2.2
SE
7
2.5
ESE
7
3
ESE
8
4
ESE
8
5
ESE
10
4
ENE
10
2.1
NNE
7
1.1
NW
4
0.8
WNW
4
0.7
WNW
4
Energy kJ
9
91
29
73
32
246
400
653
1143
2408
5085
3286
456
43
20
17
Nearest Offshore or Glassy
Rating
(10 max)
2
3
2
3
3
4
3
3
3
4
4
4
4
4
4
4
2
2
1
4
2
1
4
4
Distance (km)
0
0
647
55
51
0
0
82
82
29
29
29
0
0
29
0
380
539
642
432
539
535
224
224
Best forecast wave conditions in Shikoku
Rating
(10 max)
2
3
3
3
4
3
3
3
4
4
4
4
4
4
4
Best forecast wave conditions in Japan
Rating
(10 max)
2
3
2
3
3
4
3
3
4
4
4
4
4
4
4
4
4
2
3
4
2
1
6
4
Header Global
Rating
(10 max)
7
7
6
6
5
5
5
5
5
5
5
4
5
5
5
8
5
4
5
4
6
4
4
5
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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