Amatu surfForecast / Chiba / Japan

information circle48hr Weather and Surf, issued 2 am Wednesday 13 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
18.9° C
(Which is 1.2°C colder than average for this time of year)

How big are the waves at Amatu today?

The current surf forecast for Amatu at 9AM is: 1.6m 9s primary swell from a East-southeast direction and 0.1m 12s secondary swell from a Northeast direction (forecast issued at 02:00am May 13). The wind direction is predicted to be cross-offshore and the swell rating is 2.

Time (JST) & DateWave HeightWave Period
Morning (13 May)5ft (1.6m)9s
Afternoon (13 May)5.5ft (1.7m)9s
Evening (13 May)5.5ft (1.7m)10s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Light rain (total 7mm), mostly falling on Wed night. Warm (max 22°C on Wed morning, min 15°C on Thu night). Wind will be generally light.

Wednesday
13
Thursday
14
Friday
15
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)
2
2
2
2
0
1
2
3
2
2
2
1
0
0
0
1
1
1
1
1
0
1
0
1
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
1.4
SE
9
1.5
ESE
9
1.5
ESE
9
1.6
ESE
9
1.7
ESE
9
1.7
ESE
9
1.7
ESE
10
1.7
ESE
10
1.6
ESE
10
1.6
ESE
10
1.6
ESE
10
1.6
ESE
10
1.4
ESE
9
1.5
E
9
1.4
E
9
1.5
E
9
1.5
E
9
1.5
E
9
1.4
E
9
1.3
E
9
1.2
E
9
1.1
E
9
1.1
E
9
1
E
9
Wave Graph
Metric surfscale
Energy kJ
323
362
370
398
455
528
539
561
471
471
445
435
355
380
332
383
390
382
332
282
241
202
201
162
Wind (km/h)
5
NE
10
NNE
10
NNE
10
NE
15
E
10
ESE
5
ESE
5
E
5
N
10
NNE
15
NE
20
NE
15
ENE
20
ENE
20
ENE
20
NE
20
NE
15
NE
20
NE
20
NE
15
ENE
15
E
15
E
10
ESE
cross-off
cross-off
cross-off
cross-off
cross-on
cross-on
cross-on
glassy
off
cross-off
cross-off
cross-off
cross
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross-on
cross-on
High Tide
1:31AM1.24m
2:02PM1.16m
2:01AM1.30m
3:03PM1.26m
2:33AM1.36m
3:59PM1.35m
Low Tide
7:55AM0.46m
7:54PM0.54m
8:35AM0.26m
8:44PM0.61m
9:16AM0.06m
clear
clear
clear
clear
clear
clear
thunderstorm
thunderstorm
rain showers
cloud
cloud
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
cloud
part cloud
part cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:37
4:37
4:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:32
6:34
6:35
1
2
1
1
1
1
Temp °C
17
16
17
20
22
21
20
18
18
17
17
19
20
19
17
16
16
15
15
17
19
19
18
19
17
15
16
19
21
21
21
19
18
17
16
17
18
16
14
13
14
13
12
14
17
17
17
19
Swell 1
Height (m)
Direction
Period (s)
1.4
SE
9
1.5
ESE
9
1.5
ESE
9
1.6
ESE
9
1.7
ESE
9
1.7
ESE
9
1.7
ESE
10
1.7
ESE
10
1.6
ESE
10
1.6
ESE
10
1.6
ESE
10
1.6
ESE
10
1.4
ESE
9
1.5
E
9
1.4
E
9
1.5
E
9
1.5
E
9
1.5
E
9
1.4
E
9
1.3
E
9
1.2
E
9
1.1
E
9
1.1
E
9
1
E
9
Energy kJ
323
362
370
398
455
528
539
561
471
471
445
435
355
380
332
383
390
382
332
282
241
202
201
162
Swell 2
Height (m)
Direction
Period (s)
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.1
NE
12
0.1
NE
11
0.1
NE
11
0.1
NE
10
0.1
NE
10
0.1
NE
10
0.1
NE
10
0.1
NE
10
0.2
NNE
10
0.1
S
7
0.1
S
7
0.1
NE
10
0.1
NE
10
0.1
NE
10
0.1
NE
10
0.2
SSE
12
0.4
SE
10
0.6
SE
10
0.5
SE
9
0.5
SE
9
0.5
SE
9
Energy kJ
3
3
3
6
5
4
4
4
4
4
4
9
1
1
4
4
4
4
14
35
60
43
41
41
Swell 3
Height (m)
Direction
Period (s)
0.1
N
13
0.1
S
9
0.1
E
12
0.1
NE
9
0.1
S
8
0.1
S
9
0.1
S
7
0.1
S
7
0.1
NE
10
0.2
SSE
12
0.2
SSE
12
0.3
SE
12
0.3
SE
11
0.3
SE
11
Energy kJ
3
2
3
3
1
2
1
1
4
15
15
22
20
19
Wind waves
Height (m)
Direction
Period (s)
0.5
NE
3
0.6
NE
4
0.8
NE
4
0.9
NE
5
1
NE
5
0.8
NE
5
0.6
NNE
5
0.6
NNE
9
Energy kJ
5
11
26
37
50
31
17
55
Nearest Offshore or Glassy
Rating
(10 max)
2
2
2
2
1
2
2
3
2
2
2
1
1
2
1
1
2
2
2
2
1
1
2
1
Distance (km)
0
0
0
0
35
24
24
0
0
0
0
35
35
35
87
35
40
35
40
40
35
87
24
24
Best forecast wave conditions in Chiba
Rating
(10 max)
2
2
2
2
2
2
2
3
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Best forecast wave conditions in Japan
Rating
(10 max)
2
2
2
2
3
3
3
3
3
3
2
2
2
2
2
2
2
2
2
2
2
1
2
2
Header Global
Rating
(10 max)
8
9
9
9
9
9
9
8
7
9
9
9
9
8
5
5
5
5
5
5
5
5
5
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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