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Surf Forecasts:
Amatu surfForecast / Chiba / Japan
48hr Weather and Surf, issued 2 pm 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 8PM is: 1.0m 10s primary swell from a Southeast direction and 0.5m 9s secondary swell from a East direction, 0.7m 4s secondary swell from a Southwest direction (forecast issued at 02:00pm May 20). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | - | - |
| Afternoon (20 May) | 3ft (0.9m) | 10s |
| Evening (20 May) | 3ft (0.9m) | 10s |
Table - waves today at Amatu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 13mm), heaviest on Thu night. Warm (max 25°C on Thu morning, min 15°C on Fri afternoon). Winds increasing (light winds from the NE on Thu night, fresh winds from the NNE by Fri afternoon). | ||||||||||||||||||||||||
Wed 20 | Thursday 21 | Friday 22 | Sat 23 | |||||||||||||||||||||
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 | 6 AM | 9 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
ESE 10 | ESE 10 | SE 10 | SSE 10 | SE 10 | ESE 10 | ESE 10 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SW 8 | SSW 8 | SSW 8 | SSW 8 | NE 7 | NE 8 | NE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | |
168 | 164 | 235 | 171 | 200 | 145 | 145 | 206 | 397 | 515 | 572 | 531 | 796 | 263 | 191 | 143 | 253 | 613 | 902 | 969 | 1069 | 948 | 938 | 838 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 8:31PM1.28m | 6:24AM1.39m | 9:24PM1.23m | 7:16AM1.29m | 10:17PM1.20m | 8:25AM1.17m | ||||||||||||||||||
Low Tide | 1:04PM-0.13m | 1:07AM0.96m | 1:55PM0.02m | 2:02AM0.96m | 2:50PM0.18m | 3:17AM0.93m | ||||||||||||||||||
 |  |  |  | |  | |  | |  | |  | | | | | | | | | | | | | |
 | — | — | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:30 | — | — |
 | — | — | 6:38 | — | — | — | — | — | — | — | 6:39 | — | — | — | — | — | — | — | 6:39 | — | — | — | — | 6:40 |
— | — | — | — | — | — | — | 1 | 1 | 1 | 1 | 1 | 3 | 5 | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 24 | 24 | 22 | 22 | 21 | 22 | 23 | 24 | 25 | 22 | 21 | 17 | 16 | 16 | 17 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 16 |
23 | 23 | 23 | 23 | 22 | 22 | 23 | 23 | 22 | 19 | 20 | 16 | 13 | 13 | 14 | 11 | 10 | 8 | 8 | 9 | 10 | 10 | 10 | 11 | |
Swell 1 Height (m) Direction Period (s) | ESE 10 | ESE 10 | SE 10 | SSE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | S 7 | S 7 | S 7 | SSW 8 | S 7 | SSE 7 | S 7 | S 7 |
 kJ | 168 | 164 | 235 | 171 | 200 | 145 | 145 | 105 | 107 | 107 | 85 | 74 | 430 | 263 | 191 | 143 | 81 | 47 | 38 | 49 | 15 | 15 | 15 | 15 |
Swell 2 Height (m) Direction Period (s) | NE 8 | NE 8 | NE 8 | E 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 7 | — | NE 7 | NE 6 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SW 8 | SW 8 | SW 8 | S 9 | SW 8 | SW 8 | SW 8 | SW 8 |
| kJ | 11 | 11 | 11 | 40 | 6 | 6 | 6 | 6 | 2 | — | 2 | 2 | 52 | 52 | 54 | 54 | 53 | 32 | 34 | 6 | 24 | 24 | 10 | 10 |
Swell 3 Height (m) Direction Period (s) | — | — | — | ENE 8 | S 8 | — | — | E 12 | — | NE 11 | — | E 11 | NE 6 | NE 11 | ESE 10 | WSW 8 | ESE 10 | ESE 10 | — | — | S 9 | — | — | — |
| kJ | — | — | — | 6 | 1 | — | — | 3 | — | 5 | — | 2 | 9 | 4 | 54 | 26 | 55 | 38 | — | — | 6 | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | SW 4 | SW 4 | SSW 4 | S 6 | S 6 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SW 8 | NE 6 | NE 7 | NE 7 | NE 7 | NE 8 | NE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 |
| kJ | 29 | 21 | 18 | 6 | 14 | 39 | 115 | 206 | 397 | 515 | 572 | 531 | 796 | 82 | 109 | 131 | 253 | 613 | 902 | 969 | 1069 | 948 | 938 | 838 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 540 | 540 | 96 | 96 | 35 | 96 | 86 | 75 | 30 | 30 | 29 | 0 | 35 | 184 | 279 | 190 | 190 | 190 | 190 | 190 | 190 | 622 | 846 | 846 |
Best forecast wave conditions in Chiba | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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