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Surf Forecasts:
Amatu surfForecast / Chiba / Japan
48hr Weather and Surf, issued 8 am Monday 20 Apr 2026 JSTForecast 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
17.5° C
(Which is slightly cooler than normal)How big are the waves at Amatu today?
The current surf forecast for Amatu at 1PM is: 2.3m 13s primary swell from a Southeast direction and 0.3m 10s secondary swell from a East-northeast direction (forecast issued at 08:00am April 20). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Apr) | 8ft (2.5m) | 13s |
| Afternoon (20 Apr) | 7ft (2.2m) | 13s |
| Evening (20 Apr) | 6.5ft (2.0m) | 12s |
Table - waves today at Amatu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 20 | Tuesday 21 | Wednesday 22 | Thu 23 | |||||||||||||||||||||
| 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 7 | 7 | 7 | 7 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 2357 | 2126 | 1862 | 1583 | 1381 | 1148 | 1111 | 990 | 711 | 617 | 645 | 560 | 480 | 365 | 310 | 774 | 492 | 522 | 480 | 200 | 217 | 207 | 169 | 131 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross | cross- on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- off | cross | cross | cross | cross | cross- on | on | on | on | cross- on | cross- on | cross | cross- on | glass |
High Tide / height (m) | 5:20AM 1.45 | 7:23PM 1.30 | 5:51AM 1.43 | 8:23PM 1.21 | 6:25AM 1.38 | 9:31PM 1.12 | ||||||||||||||||||
Low Tide / height (m) | 12:20PM -0.20 | 12:24AM 0.80 | 1:06PM -0.14 | 12:58AM 0.88 | 1:58PM -0.03 | 1:35AM 0.94 | ||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thu 23 | |||||||||||||||||||||
| Sunrise | 5:01 | - | - | - | - | - | - | - | 5:00 | - | - | - | - | - | - | - | 4:58 | - | - | - | - | - | - | - |
| Sunset | - | - | - | - | 6:15 | - | - | - | - | - | - | - | 6:15 | - | - | - | - | - | - | - | 6:15 | - | - | - |
 | | |  |  |  | |  | | | | | | | | | | | | | |  | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
| Temp. °C | 16 | 18 | 19 | 18 | 17 | 17 | 17 | 17 | 17 | 19 | 19 | 21 | 16 | 16 | 15 | 16 | 16 | 18 | 19 | 19 | 18 | 18 | 17 | 17 |
| Feels °C (?) | 15 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 15 | 17 | 19 | 12 | 10 | 9 | 12 | 13 | 14 | 15 | 17 | 18 | 18 | 17 | 18 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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.
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