Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Amatu surfForecast / Chiba / Japan
48hr Weather and Surf, issued 8 pm Tuesday 30 Dec 2025 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
18.6° C
(Which is normal for this time of year)How big are the waves at Amatu today?
The current surf forecast for Amatu at 11PM is: 0.4m 14s primary swell from a East-northeast direction and 0.3m 11s secondary swell from a East direction (forecast issued at 08:00pm December 30). An open ocean swell of 1.5m 7s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (30 Dec) | - | - |
| Afternoon (30 Dec) | - | - |
| Evening (30 Dec) | 5ft (1.6m) | 7s |
Table - waves today at Amatu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tue 30 | Wednesday 31 | Thursday 01 | Friday 02 | |||||||||||||||||||||
| 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 | 6 AM | 9 AM | 12 PM | 3 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |   |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 6 | 7 | 14 | 7 | 13 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 15 | 7 | 8 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 112 | 220 | 73 | 88 | 47 | 55 | 60 | 60 | 115 | 131 | 101 | 55 | 85 | 206 | 292 | 219 | 202 | 397 | 365 | 190 | 187 | 149 | 149 | 230 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross- off | cross- off | off | off | off | cross- off | cross- off | cross- off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | cross- off |
High Tide / height (m) | 2:57AM 1.18 | 12:50PM 1.35 | 4:03AM 1.30 | 1:47PM 1.40 | 4:55AM 1.38 | 2:44PM 1.46 | ||||||||||||||||||
Low Tide / height (m) | 7:29PM 0.28 | 7:18AM 1.00 | 8:27PM 0.09 | 8:33AM 1.05 | 9:20PM -0.06 | 9:44AM 1.05 | ||||||||||||||||||
Tue 30 | Wednesday 31 | Thursday 01 | Friday 02 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 6:47 | - | - | - | - | - | - | - | 6:47 | - | - | - | - | - | - | - | 6:47 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:36 | - | - | - | - | - | - | - | 4:37 | - | - | - | - | - | - | - | 4:37 |
 | |  | |  |  |  | | | | | | |  | | | | |  | |  | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | 1 | - | - | - |
| Temp. °C | 14 | 13 | 11 | 10 | 9 | 10 | 12 | 12 | 10 | 10 | 9 | 8 | 8 | 7 | 7 | 7 | 8 | 7 | 6 | 5 | 5 | 5 | 7 | 7 |
| Feels °C (?) | 9 | 7 | 6 | 7 | 6 | 7 | 10 | 9 | 7 | 7 | 5 | 3 | 3 | 1 | 2 | 3 | 5 | 4 | 1 | 1 | 2 | 1 | 4 | 3 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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