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Surf Forecasts:
Amatu surfForecast / Chiba / Japan
48hr Weather and Surf, issued 2 pm Monday 18 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
20.8° C
(Which is normal for this time of year)How big are the waves at Amatu today?
The current surf forecast for Amatu at 10PM is: 0.9m 9s primary swell from a East-southeast direction and 0.4m 7s secondary swell from a Southeast direction, 0.3m 2s secondary swell from a South-southwest direction (forecast issued at 02:00pm May 18). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | - | - |
| 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 ForecastLight rain (total 9mm), mostly falling on Thu morning. Warm (max 23°C on Wed morning, min 18°C on Mon night). Wind will be generally light. | ||||||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
E 9 | E 9 | E 9 | ESE 9 | E 8 | SE 10 | E 10 | E 10 | E 9 | E 10 | E 10 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | SE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | |
151 | 158 | 158 | 126 | 90 | 104 | 117 | 120 | 87 | 90 | 90 | 110 | 134 | 108 | 127 | 124 | 127 | 164 | 161 | 142 | 177 | 177 | 157 | 161 | |
Wind (km/h) | ||||||||||||||||||||||||
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-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | |
High Tide | 6:43PM1.40m | 4:56AM1.49m | 7:37PM1.34m | 5:38AM1.46m | 8:31PM1.28m | 6:24AM1.39m | ||||||||||||||||||
Low Tide | 11:27AM-0.26m | 11:41PM0.90m | 12:15PM-0.22m | 00:22AM0.94m | 1:04PM-0.13m | 1:07AM0.96m | ||||||||||||||||||
 | | |  | | | | | | | |  | | |  | | |  | |  |  |  |  | | |
 | — | — | — | — | — | 4:33 | — | — | — | — | — | — | — | 4:31 | — | — | — | — | — | — | — | 4:31 | — | — |
 | — | — | 6:37 | — | — | — | — | — | — | — | 6:37 | — | — | — | — | — | — | — | 6:38 | — | — | — | — | 6:39 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | 3 | |
Temp °C | 22 | 22 | 20 | 20 | 19 | 18 | 19 | 21 | 22 | 22 | 20 | 19 | 19 | 19 | 19 | 22 | 23 | 23 | 22 | 21 | 21 | 21 | 21 | 19 |
21 | 21 | 20 | 20 | 19 | 18 | 19 | 19 | 20 | 20 | 19 | 18 | 17 | 18 | 18 | 21 | 21 | 22 | 23 | 22 | 22 | 22 | 23 | 20 | |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | ESE 9 | E 8 | SE 10 | E 10 | E 10 | E 9 | E 10 | E 10 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | SE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 |
 kJ | 151 | 158 | 158 | 126 | 90 | 104 | 117 | 120 | 87 | 88 | 90 | 110 | 134 | 108 | 127 | 124 | 127 | 164 | 161 | 142 | 177 | 177 | 157 | 161 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SSE 7 | S 7 | SE 7 | SE 10 | E 8 | SE 8 | SE 8 | SE 10 | SE 11 | SE 11 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | NE 8 | NE 8 | E 9 | ENE 8 | ENE 8 | ENE 8 | S 6 |
| kJ | 14 | 21 | 27 | 12 | 35 | 45 | 48 | 48 | 77 | 90 | 90 | 92 | 71 | 71 | 70 | 70 | 52 | 11 | 11 | 40 | 6 | 6 | 6 | 1 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SSE 7 | E 9 | ENE 9 | ENE 9 | ENE 9 | NE 9 | ENE 9 | NE 9 | NE 10 | SSE 4 | SSE 5 | NE 8 | NE 8 | — | — | ENE 8 | NE 8 | SSW 4 | S 6 | E 12 |
| kJ | 16 | 16 | 16 | 16 | 19 | 28 | 8 | 8 | 8 | 3 | 8 | 13 | 14 | 8 | 7 | 11 | 11 | — | — | 6 | 16 | 3 | 1 | 3 |
Wind waves Height (m) Direction Period (s) | — | — | SSW 2 | SSW 2 | SW 3 | SSW 3 | SSW 3 | SSW 3 | SSW 3 | SSW 4 | SSW 4 | SSW 4 | SSW 4 | SW 4 | WSW 4 | SW 4 | SW 4 | SSW 4 | SSW 4 | SW 4 | — | SW 4 | NE 8 | NE 4 |
| kJ | — | — | 1 | 1 | 2 | 3 | 4 | 4 | 7 | 11 | 11 | 9 | 9 | 12 | 13 | 17 | 12 | 10 | 5 | 5 | — | 3 | 28 | 23 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 24 | 24 | 24 | 126 | 126 | 35 | 96 | 126 | 127 | 567 | 540 | 96 | 96 | 96 | 30 | 30 | 86 | 540 | 96 | 24 | 24 | 30 | 12 | 0 |
Best forecast wave conditions in Chiba | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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