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Surf Forecasts:
Amatu surfForecast / Chiba / Japan
48hr Weather and Surf, issued 8 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 3AM is: 0.9m 10s primary swell from a East-southeast direction and 0.2m 8s secondary swell from a East-northeast direction, 0.9m 5s secondary swell from a South direction (forecast issued at 08:00pm May 20). The wind direction is predicted to be cross-shore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 May) | 5ft (1.6m) | 6s |
| Afternoon (21 May) | 7.5ft (2.3m) | 7s |
| Evening (21 May) | 5ft (1.6m) | 8s |
Table - waves today at Amatu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 17mm), heaviest on Thu night. Warm (max 24°C on Thu morning, min 14°C on Fri night). Winds increasing (light winds from the NNE on Thu afternoon, strong winds from the NNE by Fri afternoon). | ||||||||||||||||||||||||
Wed 20 | Thursday 21 | Friday 22 | Saturday 23 | |||||||||||||||||||||
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 | 12 PM | 3 PM | |
Swell Height Map |   |    |    |    | ||||||||||||||||||||
ESE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | SSW 6 | SSW 7 | SSW 7 | SW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | NE 7 | NE 8 | NE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | E 9 | |
161 | 117 | 142 | 145 | 117 | 218 | 383 | 530 | 820 | 303 | 264 | 226 | 191 | 155 | 247 | 606 | 941 | 1244 | 1169 | 1021 | 890 | 778 | 758 | 661 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | cross | 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 | cross-off | cross-off | cross | |
High Tide | 8:31PM1.28m | 6:24AM1.39m | 9:24PM1.23m | 7:16AM1.29m | 10:17PM1.20m | 8:25AM1.17m | ||||||||||||||||||
Low Tide | 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 | — | 1 | 6 | 1 | — | 1 | 2 | — | 1 | — | — | — | — | — | — | |
Temp °C | 22 | 22 | 22 | 22 | 22 | 24 | 24 | 22 | 18 | 17 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 14 | 15 | 14 | 15 | 17 | 18 | 18 |
23 | 23 | 23 | 22 | 22 | 22 | 21 | 19 | 18 | 15 | 13 | 14 | 12 | 11 | 11 | 8 | 8 | 8 | 10 | 9 | 10 | 12 | 13 | 13 | |
Swell 1 Height (m) Direction Period (s) | ESE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | S 7 | S 7 | SSW 8 | SW 8 | SW 8 | S 7 | S 7 | SSW 7 | SW 7 |
 kJ | 161 | 117 | 142 | 145 | 117 | 115 | 105 | 83 | 389 | 303 | 264 | 226 | 191 | 155 | 86 | 49 | 37 | 33 | 17 | 17 | 8 | 8 | 10 | 8 |
Swell 2 Height (m) Direction Period (s) | NE 8 | E 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 7 | — | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SW 8 | SW 8 | S 9 | S 7 | — | SW 8 | SW 8 | SE 7 | S 6 |
| kJ | 11 | 40 | 6 | 6 | 6 | 6 | 2 | — | 83 | 74 | 72 | 52 | 54 | 54 | 55 | 17 | 16 | 2 | 8 | — | 10 | 2 | 2 | 3 |
Swell 3 Height (m) Direction Period (s) | — | ENE 8 | — | — | — | E 12 | — | NE 11 | — | NE 5 | NE 11 | NE 11 | NE 10 | ESE 10 | WSW 8 | ESE 10 | — | — | — | — | — | — | — | — |
| kJ | — | 6 | — | — | — | 3 | — | 5 | — | 4 | 5 | 4 | 4 | 54 | 26 | 40 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | S 4 | S 4 | S 5 | S 6 | SSW 6 | SSW 7 | SSW 7 | SW 8 | NNE 5 | NE 5 | NE 6 | NE 6 | NE 7 | NE 7 | NE 8 | NE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | E 9 |
| kJ | 17 | 18 | 19 | 43 | 106 | 218 | 383 | 530 | 820 | 23 | 25 | 43 | 74 | 155 | 247 | 606 | 941 | 1244 | 1169 | 1021 | 890 | 778 | 758 | 661 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 96 | 96 | 35 | 96 | 96 | 75 | 30 | 30 | 0 | 35 | 35 | 16 | 279 | 519 | 190 | 554 | 558 | 190 | 622 | 601 | 846 | 846 | 929 | 889 |
Best forecast wave conditions in Chiba | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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