Amatu surfForecast / Chiba / Japan

information circle48hr Weather and Surf, issued 2 pm 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
18.0° C
(Which is 2.3°C colder than average for this time of year)

How big are the waves at Amatu today?

The current surf forecast for Amatu at 6PM is: 1.7m 10s primary swell from a East-southeast direction and 0.1m 10s secondary swell from a Northeast direction (forecast issued at 02:00pm May 13). The wind direction is predicted to be glassy and the swell rating is 3.

Time (JST) & DateWave HeightWave Period
Morning (13 May)--
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 6mm), mostly falling on Wed night. Warm (max 21°C on Wed afternoon, min 14°C on Thu night). Wind will be generally light.

Wed
13
Thursday
14
Friday
15
Sat
16
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
12 AM
3 AM
6 AM
9 AM
Rating
(10 max)
0
1
3
3
2
2
2
2
0
0
0
0
1
1
1
1
0
0
2
1
2
2
2
1
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
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
1.5
ESE
10
1.4
ESE
9
1.4
ESE
9
1.6
E
9
1.6
E
9
1.4
E
9
1.5
E
9
1.5
E
9
1.3
E
9
1.3
E
9
1.3
E
9
1.4
ENE
9
1.1
E
9
1.1
E
9
1.1
E
9
1
E
9
0.9
E
9
Wave Graph
Metric surfscale
Energy kJ
455
475
539
561
471
471
445
383
321
307
427
425
339
383
375
293
287
288
340
196
201
192
155
126
Wind (km/h)
15
ESE
10
SE
5
E
5
NNE
5
NE
10
NE
10
NE
15
NE
20
ENE
25
ENE
20
ENE
25
NE
20
NNE
20
NE
20
NE
20
NE
20
ENE
15
ENE
15
E
10
E
5
NE
10
NNE
10
NNE
15
NE
cross-on
cross-on
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross
cross
cross-off
cross-off
cross-off
cross-off
High Tide
2:02PM1.16m
2:01AM1.30m
3:03PM1.26m
2:33AM1.36m
3:59PM1.35m
3:05AM1.42m
Low Tide
7:54PM0.54m
8:35AM0.26m
8:44PM0.61m
9:16AM0.06m
9:31PM0.69m
clear
thunderstorm
thunderstorm
thunderstorm
clear
part cloud
part cloud
part cloud
thunderstorm
thunderstorm
cloud
cloud
cloud
clear
part cloud
cloud
clear
clear
clear
clear
clear
clear
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:37
4:35
4:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:32
6:34
6:35
6:36
1
1
2
1
1
Temp °C
21
21
20
19
18
17
17
20
20
19
17
16
15
14
15
16
18
18
18
18
17
17
16
19
20
21
21
20
18
17
16
18
17
16
14
12
12
11
12
13
15
16
17
17
17
16
15
17
Swell 1
Height (m)
Direction
Period (s)
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
1.5
ESE
10
1.4
ESE
9
1.4
ESE
9
0.1
NE
10
1.6
E
9
1.4
E
9
1.5
E
9
0.3
SE
12
0.6
SE
10
0.5
SE
10
1.3
E
9
1.2
E
9
1.1
E
9
1.1
E
9
1.1
E
9
1
E
9
0.9
E
9
Energy kJ
455
475
539
561
471
471
445
383
321
307
4
425
339
383
21
57
47
288
246
196
201
192
155
126
Swell 2
Height (m)
Direction
Period (s)
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
0.1
S
7
0.1
S
7
0.2
NNE
10
0.3
NE
10
0.1
NE
10
0.1
NE
10
0.1
NE
10
0.1
SE
10
0.1
SE
12
0.2
SSE
12
0.5
SE
9
0.5
SE
9
0.5
SE
9
0.4
SE
9
0.4
SE
9
0.5
SE
10
0.5
SE
9
Energy kJ
5
4
4
4
4
4
4
1
1
10
16
4
4
4
4
6
15
43
37
37
27
28
46
40
Swell 3
Height (m)
Direction
Period (s)
0.1
S
8
0.1
S
9
0.1
S
7
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.3
SE
12
0.3
SE
11
0.3
SE
11
0.3
SE
11
0.3
SE
11
0.3
SE
11
0.3
SE
12
Energy kJ
1
2
1
3
3
3
22
19
19
19
19
19
22
Wind waves
Height (m)
Direction
Period (s)
0.5
ENE
3
0.6
ENE
4
1.6
E
9
1
NE
5
0.6
NE
4
1.1
NE
5
1.5
E
9
1.3
E
9
1.3
E
9
0.7
NE
7
1.4
ENE
9
0.4
NE
6
Energy kJ
7
11
427
41
16
53
375
293
287
46
340
10
Nearest Offshore or Glassy
Rating
(10 max)
2
2
3
3
2
2
2
2
1
1
1
1
2
3
2
2
2
1
1
1
2
2
2
1
Distance (km)
30
24
0
0
0
0
0
0
35
87
87
537
35
40
40
35
40
43
87
35
0
0
0
0
Best forecast wave conditions in Chiba
Rating
(10 max)
2
2
3
3
2
2
2
2
2
3
3
2
2
2
2
2
2
2
1
Best forecast wave conditions in Japan
Rating
(10 max)
2
2
3
3
2
2
2
2
2
1
2
2
3
3
2
2
2
1
1
2
3
2
3
3
Header Global
Rating
(10 max)
9
9
8
8
7
8
9
9
9
9
5
5
5
5
5
5
5
5
5
5
6
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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