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Surf Forecasts:
Amatu surfForecast / Chiba / Japan
48hr Weather and Surf, issued 8 pm Sunday 17 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
19.8° C
(Which is slightly cooler than normal)How big are the waves at Amatu today?
The current surf forecast for Amatu at 4AM is: 1.2m 8s primary swell from a East-southeast direction and 0.1m 11s secondary swell from a Northeast direction (forecast issued at 08:00pm May 17). The wind direction is predicted to be glassy and the swell rating is 2.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | 3.5ft (1.1m) | 9s |
| Afternoon (18 May) | 3.5ft (1.0m) | 9s |
| Evening (18 May) | 3ft (0.9m) | 9s |
Table - waves today at Amatu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 11mm), heaviest on Wed morning. Warm (max 22°C on Mon morning, min 18°C on Sun night). Wind will be generally light. | ||||||||||||||||||||||||
Sun 17 | Monday 18 | Tuesday 19 | Wednesday 20 | |||||||||||||||||||||
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 8 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 9 | E 9 | E 9 | ESE 9 | ESE 9 | ESE 8 | E 9 | E 10 | E 10 | E 9 | SE 11 | E 10 | E 10 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 10 | |
227 | 243 | 232 | 217 | 212 | 193 | 151 | 158 | 162 | 126 | 118 | 101 | 117 | 120 | 85 | 90 | 90 | 92 | 110 | 106 | 127 | 102 | 127 | 164 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-off | glassy | cross-off | cross-off | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-off | cross-off | |
High Tide | 5:49PM1.42m | 4:17AM1.49m | 6:43PM1.40m | 4:56AM1.49m | 7:37PM1.34m | 5:38AM1.46m | ||||||||||||||||||
Low Tide | 10:59PM0.84m | 11:27AM-0.26m | 11:41PM0.90m | 12:15PM-0.22m | 00:22AM0.94m | 1:04PM-0.13m | ||||||||||||||||||
 |  | | | | | | | | | | | | |  | | | | |  |  | |  | | |
 | — | — | — | 4:33 | — | — | — | — | — | — | — | 4:33 | — | — | — | — | — | — | — | 4:31 | — | — | — | — |
 | 6:36 | — | — | — | — | — | — | — | 6:37 | — | — | — | — | — | — | — | 6:37 | — | — | — | — | — | — | 6:38 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 4 | |
Temp °C | 20 | 18 | 18 | 18 | 18 | 21 | 22 | 22 | 20 | 20 | 19 | 19 | 19 | 21 | 22 | 22 | 20 | 19 | 19 | 19 | 20 | 20 | 18 | 18 |
19 | 17 | 18 | 18 | 18 | 21 | 21 | 21 | 20 | 20 | 19 | 19 | 19 | 20 | 20 | 20 | 19 | 18 | 18 | 17 | 20 | 19 | 19 | 18 | |
Swell 1 Height (m) Direction Period (s) | ESE 8 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 9 | E 9 | E 9 | ESE 9 | ESE 9 | ESE 8 | E 9 | E 10 | E 10 | E 9 | E 9 | E 10 | E 10 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 10 |
 kJ | 227 | 243 | 232 | 217 | 212 | 193 | 151 | 158 | 162 | 126 | 118 | 101 | 117 | 120 | 85 | 87 | 90 | 92 | 110 | 106 | 127 | 102 | 127 | 164 |
Swell 2 Height (m) Direction Period (s) | ENE 9 | ENE 9 | ENE 9 | NE 11 | NE 11 | SSE 8 | SE 8 | SE 7 | SE 7 | SSE 7 | SE 10 | SE 11 | SE 8 | SE 8 | SE 10 | SE 11 | SE 11 | SE 11 | E 10 | E 10 | E 10 | E 10 | E 10 | SSW 4 |
| kJ | 8 | 30 | 16 | 5 | 4 | 6 | 14 | 14 | 14 | 16 | 35 | 92 | 48 | 48 | 77 | 90 | 90 | 90 | 71 | 71 | 70 | 70 | 52 | 6 |
Swell 3 Height (m) Direction Period (s) | NE 9 | NE 9 | NE 9 | ENE 11 | NNE 9 | NE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 7 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | NE 9 | ENE 9 | NE 9 | NE 10 | NE 9 | NE 9 | NE 9 | NE 8 | NE 8 |
| kJ | 20 | 3 | 12 | 12 | 7 | 4 | 16 | 16 | 16 | 16 | 13 | 8 | 8 | 8 | 8 | 3 | 8 | 13 | 14 | 13 | 12 | 12 | 11 | 11 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | S 3 | S 3 | S 3 | SSW 3 | S 3 | S 3 | S 3 | S 4 | SSW 4 | SSW 4 | SSW 4 | SW 4 | SW 4 | SSW 4 | SW 4 |
| kJ | — | — | — | — | — | — | — | — | — | 2 | 1 | 3 | 3 | 5 | 5 | 5 | 9 | 20 | 31 | 32 | 27 | 20 | 12 | 8 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 126 | 0 | 0 | 0 | 0 | 24 | 24 | 24 | 24 | 24 | 35 | 35 | 35 | 30 | 24 | 30 | 30 | 30 | 96 | 96 | 30 | 24 | 0 | 0 |
Best forecast wave conditions in Chiba | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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