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Surf Forecasts:

Amatu surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 8 pm Wednesday 20 Aug 2025 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
26.5° C
 (Which is normal for this time of year)

Best Forecast Surf Conditions for Amatu this week:

The surf forecast for Amatu over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 21) at 9PM. The primary swell is predicted to be 0.7m and 6s period with a secondary swell of 0.5m and 6s. Another secondary swell of 0.3m and 9s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Amatu in the next 12 days are 1.5m 6s and forecast to arrive on Tuesday (Aug 26) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Thu 21st Aug)2.5ft (0.7m) 6s
Best Surf 9PM (Thu 21st Aug)2.5ft (0.7m) 6s
Most Powerful 6PM (Tue 26th Aug)5ft (1.5m) 6s

Table - best surf conditions forecast for Amatu over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Some drizzle, heaviest during Thu night. Warm (max 31°C on Thu morning, min 26°C on Wed night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Warm (max 31°C on Sun morning, min 25°C on Sat night). Winds increasing (calm on Mon morning, fresh winds from the SW by Tue afternoon).

Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
Wed
27
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1
SW
0.9
SW
0.7
SSW
0.3
ENE
0.5
SW
0.3
SE
0.4
SE
0.5
SE
0.4
ESE
0.4
ESE
0.5
E
0.5
ESE
0.5
E
0.4
SE
0.4
ESE
0.4
ESE
1.1
SW
1.4
SW
1.4
SW
1.2
SW
1.3
SW
Period(s) (?)5559710998888898855666
Wave
Graph
(?)Metric surfscale
Energy (?)10190623557444952554348635435464777138172158158
Wind
(km/h)
25
SW
5
WSW
15
SSW
5
WNW
10
ENE
10
ESE
5
WNW
5
SSE
15
SSW
15
SW
10
SW
20
SSW
10
SW
5
S
15
SSW
15
SSW
25
SW
30
SW
35
SW
35
SW
25
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscrosscross-
on		glasscrosscross-
on		glassglasscross-
on		crosscrosscross-
on		crossglasscross-
on		cross-
on		cross-
on		cross-
on		cross-
on		crosscross-
on
High Tide
/ height (m)
2:09AM
1.42
4:45PM
1.44
3:09AM
1.49
5:08PM
1.47
3:58AM
1.54
5:30PM
1.49
4:41AM
1.56
5:51PM
1.50
5:21AM
1.55
6:10PM
1.50
5:58AM
1.51
6:28PM
1.50
6:34AM
1.44
Low Tide
/ height (m)
9:21PM
1.12
9:28AM
0.16
9:58PM
1.00
10:10AM
0.13
10:31PM
0.88
10:46AM
0.15
11:02PM
0.77
11:19AM
0.21
11:31PM
0.67
11:48AM
0.30
12:00AM
0.59
12:14PM
0.40
12:29AM
0.53
12:38PM
0.52
Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
Wed
27
Sunrise-5:01--5:03--5:03--5:05--5:05--5:05--5:07-
Sunset--6:21--6:20--6:19--6:17--6:15--6:15--6:14
clear
clear
clear
thunderstorm
clear
part cloud
part cloud
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
Rain (mm)
---1-----------------
Temp. °C273130273030273029263130263029262929273030
Feels °C (?)283432313333323331293332293331302829263130
  • 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

Eyeball surf reportRecent Eyeball Surf Reports for Chiba

  1. weather stationWind Update Cross-on wind has become light (light winds from the W at Katsuura 11 km from Amatu). 1.1m 5s windswell from the SSW with a 0.4m 10s swell from the E. 2 swells combining to make bigger set waves.

    56 minutes ago Amatu

  2. weather stationWind Update Cross-off wind 22 km from Tsurigasaki Surfing Beach (Tokyo 2020) has become light (light winds from the W at Katsuura). Waves should be turning clean at Tsurigasaki Surfing Beach (Tokyo 2020). 0.4m 10s swell from the E with a 0.2m 13s groundswell from the ESE and a 0.2m 10s swell from the SSE. 3 swells combining to make bigger set waves.

    56 minutes ago Tsurigasaki Surfing Beach (Tokyo 2020)
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Actual: 56 min ago

6 km/h
W
Clean
Please reload the page to see if there are any updates.

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Amatu surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Amatu at:
surf-forecast.com

Information about the Amatu Surf forecast

The above surf forecast table for Amatu provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Amatu can be found by selecting the local surf guide option on the grey menu. Our Amatu surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Amatu) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Amatu may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Amatu is 9 km (6 miles) from Kawaguchi. If you plan a holiday in Chiba, look for hotels and other accommodation in Kawaguchi. Kawaguchi has rooms for a wide range of budgets as well as car hire and transport links.

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