- Forecast
- Maps
- Live
- Weather State
- Spot Information
Amatu surfForecast / Chiba / Japan
12 Day Weather and Surf, issued 8 pm Sunday 18 May 2025 JST
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 Monday (May 19) at 9AM. The primary swell is predicted to be 6ft and 8s period with a secondary swell of 2ft and 8s. 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 10ft 7s and forecast to arrive on Thursday (May 22) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 6ft 6s period and expected on Friday (May 23) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 19th May) | 5.5ft (1.7m) 8s |
| Best Surf | 6AM (Thu 22nd May) | 10ft (3.0m) 7s |
| Most Powerful | 6AM (Thu 22nd May) | 10ft (3.0m) 7s |
Table - best surf conditions forecast for Amatu over the next 12 days.
Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | Tuesday 27 | Wednesday 28 | Thursday 29 | Fri 30 | |||||||||||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Rating (10 max) | ||||||||||||||||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||||||||||||||||||||
| Wave Height (ft) & direction (?) | ||||||||||||||||||||||||||||||||||||
| Period(s) (?) | 7 | 8 | 7 | 6 | 6 | 6 | 7 | 6 | 10 | 6 | 8 | 8 | 8 | 7 | 7 | 10 | 7 | 7 | 7 | 9 | 6 | 7 | 8 | 8 | 8 | 7 | 8 | 9 | 9 | 10 | 10 | 10 | 10 | 9 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 333 | 362 | 75 | 111 | 133 | 221 | 200 | 132 | 90 | 118 | 593 | 438 | 336 | 336 | 114 | 90 | 121 | 99 | 93 | 137 | 112 | 259 | 341 | 217 | 191 | 156 | 114 | 132 | 139 | 148 | 146 | 148 | 145 | 113 | 171 | 108 |
Wind (mph) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross- off | cross- off | cross | cross | cross | cross | cross | cross- on | cross- on | glass | cross- on | off | cross | cross | cross- on | cross- on | cross- on | cross | cross- off | cross- off | cross- off | cross- off | cross- on | cross- on | cross | cross | cross- off | cross- off | cross- on | glass | on | on | cross- on | cross- on | cross- on |
High Tide / height (ft) | 9:45PM 3.84 | 7:18AM 3.9 | 10:43PM 3.84 | 8:27AM 3.67 | 11:36PM 3.9 | 10:09AM 3.51 | 12:21AM 4.04 | 12:01PM 3.58 | 12:59AM 4.17 | 1:34PM 3.84 | 1:34AM 4.33 | 2:48PM 4.17 | 2:09AM 4.53 | 3:50PM 4.46 | 2:45AM 4.72 | 4:48PM 4.63 | 3:23AM 4.89 | 5:43PM 4.66 | 4:01AM 4.95 | 6:35PM 4.59 | 4:42AM 4.92 | 7:26PM 4.43 | 5:24AM 4.82 | |||||||||||||
Low Tide / height (ft) | 2:26AM 3.12 | 2:58PM 0.75 | 3:46AM 3.05 | 4:02PM 1.05 | 5:18AM 2.79 | 5:12PM 1.35 | 6:31AM 2.3 | 6:21PM 1.64 | 7:26AM 1.64 | 7:24PM 1.94 | 8:14AM 0.92 | 8:21PM 2.26 | 8:59AM 0.23 | 9:13PM 2.53 | 9:45AM -0.3 | 10:01PM 2.79 | 10:30AM -0.66 | 10:45PM 2.99 | 11:16AM -0.75 | 11:27PM 3.12 | 12:02PM -0.59 | 12:09AM 3.18 | 12:48PM -0.3 | |||||||||||||
Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | Tuesday 27 | Wednesday 28 | Thursday 29 | Fri 30 | |||||||||||||||||||||||||
| Sunrise | - | 4:33 | - | - | 4:31 | - | - | 4:31 | - | - | 4:31 | - | - | 4:30 | - | - | 4:30 | - | - | 4:28 | - | - | 4:28 | - | - | 4:28 | - | - | 4:28 | - | - | 4:26 | - | - | 4:26 | - |
| Sunset | - | - | 6:37 | - | - | 6:38 | - | - | 6:39 | - | - | 6:39 | - | - | 6:40 | - | - | 6:42 | - | - | 6:42 | - | - | 6:43 | - | - | 6:44 | - | - | 6:45 | - | - | 6:45 | - | - | 6:45 |
 |  |  |  |  | | | |  | | | |  | | | | | |  | | | | | |  |  | | | | |  | | | | | | |
Rain (in) | - | 0.2 | - | - | - | - | - | - | - | - | - | - | 0.0 | - | - | - | - | - | 0.3 | 0.2 | - | - | - | - | 0.0 | 0.4 | 0.1 | 0.2 | - | - | - | - | - | - | - | - |
| Temp. °F | 72 | 64 | 63 | 68 | 73 | 73 | 70 | 73 | 72 | 70 | 75 | 75 | 70 | 63 | 63 | 64 | 68 | 66 | 64 | 61 | 61 | 61 | 66 | 66 | 64 | 63 | 63 | 61 | 68 | 66 | 63 | 70 | 70 | 66 | 72 | 72 |
| Feels °F (?) | 68 | 66 | 61 | 64 | 66 | 66 | 64 | 72 | 68 | 66 | 79 | 73 | 66 | 55 | 57 | 61 | 64 | 64 | 63 | 55 | 54 | 55 | 63 | 63 | 64 | 61 | 57 | 55 | 66 | 64 | 64 | 68 | 68 | 66 | 72 | 72 |
Short Range Forecast: Light rain (total 0.2in), mostly falling on Mon morning. Warm (max 73°F on Tue morning, min 63°F on Mon morning). Winds increasing (calm on Mon night, fresh winds from the SW by Tue morning). | Days 3-6 Weather Summary Some drizzle, heaviest during Thu night. Warm (max 75°F on Thu morning, min 59°F on Thu night). Winds increasing (calm on Thu morning, fresh winds from the NE by Thu night). | Days 6-9 Weather Summary Heavy rain (total 1.0in), heaviest during Tue morning. Very mild (max 66°F on Mon morning, min 57°F on Sat night). Wind will be generally light. | Long Range Forecast: Light rain (total 0.2in), mostly falling on Tue night. Warm (max 72°F on Fri morning, min 59°F on Tue night). Winds decreasing (fresh winds from the NNE on Tue night, calm by Wed night). | |||||||||||||||||||||||||||||||||
Join to view 12 day and hourly surf forecasts
- Map Icons:
Break
Live Wave Height (ft)
Live Wind Speed (mph)
Surf Rating (10 Max)
Ocean Swells (ft)- Wind Speed (mph)
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.
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.
Nearest