Amatu surfForecast / Chiba / Japan

information circle48hr Weather and Surf, issued 8 pm Wednesday 20 May 2026 JST
Forecast update in hr  min  s Forecast update imminent
Amatu surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Amatu sea temperature is
21.4° C
(Which is slightly warmer than usual)

How big are the waves at Amatu today?

The current surf forecast for Amatu at 3AM is: 0.9m 10s primary swell from a East-southeast direction and 0.2m 8s secondary swell from a East-northeast direction, 0.9m 5s secondary swell from a South direction (forecast issued at 08:00pm May 20). The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (21 May)5ft (1.6m)6s
Afternoon (21 May)7.5ft (2.3m)7s
Evening (21 May)5ft (1.6m)8s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 17mm), heaviest on Thu night. Warm (max 24°C on Thu morning, min 14°C on Fri night). Winds increasing (light winds from the NNE on Thu afternoon, strong winds from the NNE by Fri afternoon).

Wed
20
Thursday
21
Friday
22
Saturday
23
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
4
1
0
1
0
0
0
0
0
!
2
2
1
1
1
0
Swell
Height Map
Height MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.9
ESE
10
0.8
SE
10
0.9
ESE
10
0.9
ESE
10
0.8
ESE
10
1.6
SSW
6
2
SSW
7
2.3
SSW
7
2.5
SW
8
1.6
SSW
8
1.5
SSW
8
1.4
SSW
8
1.3
SSW
8
1.2
SSW
8
1.6
NE
7
2.3
NE
8
2.5
NE
8
3
ENE
9
2.5
ENE
9
2.5
ENE
9
2.3
ENE
9
2.2
ENE
9
2.2
ENE
9
2
E
9
Wave Graph
Metric surfscale
Energy kJ
161
117
142
145
117
218
383
530
820
303
264
226
191
155
247
606
941
1244
1169
1021
890
778
758
661
Wind (km/h)
20
SSW
20
SSW
20
SW
25
SW
25
SW
30
SW
35
SW
35
SW
10
NNE
20
NE
25
NE
20
NNE
30
NNE
30
N
35
N
40
NNE
40
NNE
35
NNE
30
NNE
30
NNE
25
NNE
25
NE
30
NE
25
ENE
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
High Tide
8:31PM1.28m
6:24AM1.39m
9:24PM1.23m
7:16AM1.29m
10:17PM1.20m
8:25AM1.17m
Low Tide
1:07AM0.96m
1:55PM0.02m
2:02AM0.96m
2:50PM0.18m
3:17AM0.93m
cloud
cloud
light rain
cloud
part cloud
thunderstorm
thunderstorm
light rain
light rain
cloud
light rain
mod rain
light rain
cloud
light rain
light rain
cloud
light rain
cloud
cloud
cloud
cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:31
4:31
4:30
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:38
6:39
6:39
6:40
1
1
1
1
1
1
6
1
1
2
1
Temp °C
22
22
22
22
22
24
24
22
18
17
16
16
16
16
16
15
15
14
15
14
15
17
18
18
23
23
23
22
22
22
21
19
18
15
13
14
12
11
11
8
8
8
10
9
10
12
13
13
Swell 1
Height (m)
Direction
Period (s)
0.9
ESE
10
0.8
SE
10
0.9
ESE
10
0.9
ESE
10
0.8
ESE
10
0.8
ESE
10
0.8
ESE
10
0.7
ESE
10
1.9
SSW
8
1.6
SSW
8
1.5
SSW
8
1.4
SSW
8
1.3
SSW
8
1.2
SSW
8
0.9
SSW
7
0.7
S
7
0.6
S
7
0.5
SSW
8
0.4
SW
8
0.4
SW
8
0.3
S
7
0.3
S
7
0.3
SSW
7
0.3
SW
7
Energy kJ
161
117
142
145
117
115
105
83
389
303
264
226
191
155
86
49
37
33
17
17
8
8
10
8
Swell 2
Height (m)
Direction
Period (s)
0.3
NE
8
0.5
E
9
0.2
ENE
8
0.2
ENE
8
0.2
ENE
8
0.2
ENE
8
0.1
NE
7
0.7
ESE
10
0.6
ESE
10
0.6
ESE
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.4
SW
8
0.4
SW
8
0.1
S
9
0.3
S
7
0.3
SW
8
0.1
SW
8
0.1
SE
7
0.2
S
6
Energy kJ
11
40
6
6
6
6
2
83
74
72
52
54
54
55
17
16
2
8
10
2
2
3
Swell 3
Height (m)
Direction
Period (s)
0.2
ENE
8
0.1
E
12
0.1
NE
11
0.3
NE
5
0.1
NE
11
0.1
NE
11
0.1
NE
10
0.5
ESE
10
0.4
WSW
8
0.4
ESE
10
Energy kJ
6
3
5
4
5
4
4
54
26
40
Wind waves
Height (m)
Direction
Period (s)
0.7
SSW
4
0.7
S
4
0.7
S
4
0.9
S
5
1.2
S
6
1.6
SSW
6
2
SSW
7
2.3
SSW
7
2.5
SW
8
0.7
NNE
5
0.8
NE
5
0.8
NE
6
1
NE
6
1.3
NE
7
1.6
NE
7
2.3
NE
8
2.5
NE
8
3
ENE
9
2.5
ENE
9
2.5
ENE
9
2.3
ENE
9
2.2
ENE
9
2.2
ENE
9
2
E
9
Energy kJ
17
18
19
43
106
218
383
530
820
23
25
43
74
155
247
606
941
1244
1169
1021
890
778
758
661
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
2
4
1
1
2
2
1
2
1
1
1
2
2
1
1
1
1
Distance (km)
96
96
35
96
96
75
30
30
0
35
35
16
279
519
190
554
558
190
622
601
846
846
929
889
Best forecast wave conditions in Chiba
Rating
(10 max)
1
2
2
2
4
4
4
2
Best forecast wave conditions in Japan
Rating
(10 max)
2
2
2
2
3
3
3
3
4
4
4
4
2
2
2
1
1
1
2
2
1
1
1
1
Header Global
Rating
(10 max)
4
4
4
5
5
5
5
5
5
5
5
5
4
5
5
7
7
7
6
5
5
5
5
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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