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Surf Forecasts:
Amatu surfForecast / Chiba / Japan
48hr Weather and Surf, issued 8 am Wednesday 20 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
21.4° C
(Which is slightly warmer than usual)How big are the waves at Amatu today?
The current surf forecast for Amatu at 12PM is: 0.9m 10s primary swell from a East-southeast direction and 0.3m 8s secondary swell from a Northeast direction, 0.9m 4s secondary swell from a South-southwest direction (forecast issued at 08:00am May 20). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | 2.5ft (0.7m) | 10s |
| Afternoon (20 May) | 3ft (0.9m) | 10s |
| Evening (20 May) | 3.5ft (1.0m) | 10s |
Table - waves today at Amatu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 20mm), heaviest during Thu night. Warm (max 25°C on Thu morning, min 15°C on Fri morning). Mainly fresh winds. | ||||||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | Sat 23 | |||||||||||||||||||||
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 | 12 AM | 3 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | SSE 10 | SE 10 | ESE 10 | ESE 10 | S 7 | SSW 7 | SSW 7 | SW 8 | SSW 8 | SSW 8 | SSW 8 | NE 7 | NE 7 | NE 8 | NE 8 | NE 9 | ENE 9 | ENE 9 | ENE 9 | |
104 | 102 | 168 | 164 | 161 | 204 | 227 | 142 | 145 | 200 | 383 | 559 | 664 | 362 | 310 | 214 | 169 | 353 | 594 | 752 | 905 | 1198 | 1254 | 1195 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross | cross | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 5:38AM1.46m | 8:31PM1.28m | 6:24AM1.39m | 9:24PM1.23m | 7:16AM1.29m | 10:17PM1.20m | ||||||||||||||||||
Low Tide | 1:04PM-0.13m | 1:07AM0.96m | 1:55PM0.02m | 2:02AM0.96m | 2:50PM0.18m | |||||||||||||||||||
 |  | | | |  |  |  |  |  | |  | | |  | | | | | | |  | | | |
 | 4:31 | — | — | — | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:30 |
 | — | — | — | — | 6:38 | — | — | — | — | — | — | — | 6:39 | — | — | — | — | — | — | — | 6:39 | — | — | 6:40 |
— | — | — | — | — | — | 1 | 1 | — | 1 | — | 2 | 1 | 2 | 10 | 1 | — | 1 | — | — | — | — | — | — | |
Temp °C | 21 | 23 | 24 | 24 | 22 | 21 | 22 | 22 | 22 | 23 | 25 | 22 | 20 | 18 | 16 | 16 | 16 | 15 | 15 | 15 | 16 | 15 | 15 | 15 |
20 | 22 | 23 | 23 | 22 | 21 | 23 | 22 | 21 | 22 | 22 | 20 | 19 | 20 | 13 | 12 | 12 | 10 | 9 | 9 | 10 | 9 | 9 | 10 | |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | SSE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SSW 8 | ESE 10 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | S 7 | S 7 | SSW 8 | S 7 | S 7 |
 kJ | 104 | 102 | 168 | 164 | 161 | 204 | 227 | 142 | 145 | 115 | 105 | 83 | 459 | 74 | 310 | 214 | 147 | 84 | 91 | 49 | 24 | 36 | 8 | 8 |
Swell 2 Height (m) Direction Period (s) | E 10 | E 10 | NE 8 | NE 8 | NE 8 | E 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 7 | — | ESE 10 | E 11 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SW 8 | SW 8 | S 7 | SW 8 | SW 8 |
| kJ | 70 | 70 | 11 | 11 | 11 | 40 | 6 | 6 | 6 | 6 | 2 | — | 74 | 2 | 72 | 52 | 54 | 54 | 38 | 16 | 23 | 14 | 11 | 11 |
Swell 3 Height (m) Direction Period (s) | NE 9 | NE 8 | — | — | — | ENE 8 | S 8 | — | — | E 12 | — | NE 11 | — | NNE 5 | NE 6 | ESE 10 | ESE 10 | SW 8 | SW 8 | — | — | — | — | — |
| kJ | 12 | 11 | — | — | — | 6 | 1 | — | — | 3 | — | 5 | — | 11 | 16 | 52 | 54 | 31 | 17 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | SSW 4 | SSW 4 | SSW 4 | SW 4 | SSW 4 | SSW 5 | S 6 | S 7 | SSW 7 | SSW 7 | SW 8 | SSW 8 | NNE 6 | NE 5 | NE 7 | NE 7 | NE 8 | NE 8 | NE 9 | ENE 9 | ENE 9 | ENE 9 |
| kJ | 35 | 25 | 28 | 22 | 20 | 13 | 13 | 32 | 83 | 200 | 383 | 559 | 664 | 362 | 61 | 68 | 169 | 353 | 594 | 752 | 905 | 1198 | 1254 | 1195 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 30 | 127 | 231 | 231 | 96 | 96 | 96 | 96 | 96 | 52 | 52 | 30 | 29 | 0 | 117 | 189 | 279 | 519 | 190 | 537 | 537 | 537 | 537 | 190 |
Best forecast wave conditions in Chiba | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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