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Surf Forecasts:
Amatu surfForecast / Chiba / Japan
48hr Weather and Surf, issued 2 am Wednesday 13 May 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
18.9° C
(Which is 1.2°C colder than average for this time of year)How big are the waves at Amatu today?
The current surf forecast for Amatu at 9AM is: 1.6m 9s primary swell from a East-southeast direction and 0.1m 12s secondary swell from a Northeast direction (forecast issued at 02:00am May 13). The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 May) | 5ft (1.6m) | 9s |
| 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 ForecastLight rain (total 7mm), mostly falling on Wed night. Warm (max 22°C on Wed morning, min 15°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||||
Wednesday 13 | Thursday 14 | Friday 15 | ||||||||||||||||||||||
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 | 12 PM | 3 PM | 6 PM | 9 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | |
323 | 362 | 370 | 398 | 455 | 528 | 539 | 561 | 471 | 471 | 445 | 435 | 355 | 380 | 332 | 383 | 390 | 382 | 332 | 282 | 241 | 202 | 201 | 162 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | glassy | off | cross-off | cross-off | cross-off | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on | |
High Tide | 1:31AM1.24m | 2:02PM1.16m | 2:01AM1.30m | 3:03PM1.26m | 2:33AM1.36m | 3:59PM1.35m | ||||||||||||||||||
Low Tide | 7:55AM0.46m | 7:54PM0.54m | 8:35AM0.26m | 8:44PM0.61m | 9:16AM0.06m | |||||||||||||||||||
 | |  | | | |  |  |  |  |  | | | | | | | |  | | | | | | |
 | — | 4:37 | — | — | — | — | — | — | — | 4:37 | — | — | — | — | — | — | — | 4:35 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 6:32 | — | — | — | — | — | — | — | 6:34 | — | — | — | — | — | — | — | 6:35 | — |
— | — | — | — | — | — | 1 | 2 | 1 | — | — | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 17 | 16 | 17 | 20 | 22 | 21 | 20 | 18 | 18 | 17 | 17 | 19 | 20 | 19 | 17 | 16 | 16 | 15 | 15 | 17 | 19 | 19 | 18 | 19 |
17 | 15 | 16 | 19 | 21 | 21 | 21 | 19 | 18 | 17 | 16 | 17 | 18 | 16 | 14 | 13 | 14 | 13 | 12 | 14 | 17 | 17 | 17 | 19 | |
Swell 1 Height (m) Direction Period (s) | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 |
 kJ | 323 | 362 | 370 | 398 | 455 | 528 | 539 | 561 | 471 | 471 | 445 | 435 | 355 | 380 | 332 | 383 | 390 | 382 | 332 | 282 | 241 | 202 | 201 | 162 |
Swell 2 Height (m) Direction Period (s) | NE 9 | NE 9 | NE 9 | NE 12 | NE 11 | NE 11 | NE 10 | NE 10 | NE 10 | NE 10 | NE 10 | NNE 10 | S 7 | S 7 | NE 10 | NE 10 | NE 10 | NE 10 | SSE 12 | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 |
| kJ | 3 | 3 | 3 | 6 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 9 | 1 | 1 | 4 | 4 | 4 | 4 | 14 | 35 | 60 | 43 | 41 | 41 |
Swell 3 Height (m) Direction Period (s) | N 13 | S 9 | E 12 | NE 9 | — | — | S 8 | — | S 9 | — | — | S 7 | S 7 | — | — | — | — | — | NE 10 | SSE 12 | SSE 12 | SE 12 | SE 11 | SE 11 |
| kJ | 3 | 2 | 3 | 3 | — | — | 1 | — | 2 | — | — | 1 | 1 | — | — | — | — | — | 4 | 15 | 15 | 22 | 20 | 19 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | NE 3 | — | — | NE 4 | NE 4 | NE 5 | NE 5 | NE 5 | NNE 5 | NNE 9 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 5 | — | — | 11 | 26 | 37 | 50 | 31 | 17 | 55 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 35 | 24 | 24 | 0 | 0 | 0 | 0 | 35 | 35 | 35 | 87 | 35 | 40 | 35 | 40 | 40 | 35 | 87 | 24 | 24 |
Best forecast wave conditions in Chiba | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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