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Surf Forecasts:
Mera surfForecast / Chiba / Japan
48hr Weather and Surf, issued 2 pm Wednesday 20 May 2026 JSTForecast update in hr min s Forecast update imminent
Mera surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Mera sea temperature is
20.9° C
(Which is normal for this time of year)How big are the waves at Mera today?
The current surf forecast for Mera at 10PM is: 0.9m 10s primary swell from a East-southeast direction and 0.4m 4s secondary swell from a Southwest direction (forecast issued at 02:00pm May 20). An open ocean swell of 0.1m 8s is not directed at the surf break. The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | - | - |
| Afternoon (20 May) | 3.5ft (1.0m) | 10s |
| Evening (20 May) | 3.5ft (1.0m) | 10s |
Table - waves today at Mera. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 16mm), heaviest on Thu night. Warm (max 23°C on Thu morning, min 14°C on Fri night). Winds increasing (light winds from the WNW on Thu night, strong winds from the N by Fri morning). | ||||||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
SE 10 | SE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | SSW 6 | SSW 7 | SSW 7 | SW 7 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SSW 8 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SSW 8 | SSW 8 | |
192 | 188 | 181 | 177 | 157 | 142 | 130 | 298 | 401 | 691 | 740 | 724 | 535 | 378 | 314 | 289 | 219 | 175 | 129 | 98 | 69 | 41 | 34 | 32 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | on | on | on | on | on | on | on | cross | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | off | off | |
High Tide | 8:25PM1.29m | 6:11AM1.37m | 9:21PM1.22m | 7:00AM1.27m | 10:18PM1.18m | 8:06AM1.14m | ||||||||||||||||||
Low Tide | 12:59PM-0.13m | 1:04AM0.96m | 1:49PM-0.01m | 1:57AM0.95m | 2:43PM0.14m | 3:10AM0.92m | ||||||||||||||||||
 |  |  |  |  |  |  |  | | | | | | | | | | | | | | | | | |
 | — | — | — | — | — | 4:33 | — | — | — | — | — | — | — | 4:33 | — | — | — | — | — | — | — | 4:31 | — | — |
 | — | — | 6:39 | — | — | — | — | — | — | — | 6:39 | — | — | — | — | — | — | — | 6:40 | — | — | — | — | 6:42 |
— | — | — | — | 1 | — | 1 | 1 | 1 | 2 | 1 | 2 | 4 | 3 | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 21 | 21 | 21 | 22 | 21 | 21 | 22 | 22 | 23 | 22 | 22 | 19 | 17 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 16 |
19 | 19 | 21 | 22 | 21 | 20 | 21 | 20 | 19 | 17 | 18 | 20 | 13 | 11 | 10 | 7 | 7 | 6 | 7 | 6 | 7 | 7 | 8 | 10 | |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SW 8 | SW 8 | SW 8 | SSW 8 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SSW 8 | SSW 8 |
 kJ | 192 | 188 | 181 | 177 | 157 | 142 | 115 | 115 | 107 | 85 | 85 | 74 | 52 | 378 | 314 | 289 | 219 | 175 | 129 | 98 | 69 | 41 | 34 | 32 |
Swell 2 Height (m) Direction Period (s) | NE 9 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 11 | NE 6 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | — | NW 7 | S 9 | SSE 7 | — | — |
| kJ | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 5 | 2 | 54 | 54 | 54 | 52 | 37 | — | 2 | 2 | 9 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NE 12 | E 11 | NE 11 | NE 11 | NE 6 | NE 10 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 5 | 2 | 5 | 5 | 2 | 4 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 4 | SW 4 | SW 4 | S 5 | S 6 | S 6 | SSW 6 | SSW 7 | SSW 7 | SW 7 | SW 8 | SW 8 | NNE 3 | NE 4 | NE 4 | NNE 5 | NNE 5 | NE 8 | NE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 |
| kJ | 18 | 12 | 6 | 3 | 17 | 64 | 130 | 298 | 401 | 691 | 740 | 724 | 535 | 4 | 28 | 30 | 89 | 193 | 665 | 826 | 820 | 800 | 750 | 770 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 504 | 504 | 73 | 73 | 73 | 73 | 73 | 61 | 61 | 36 | 43 | 12 | 14 | 148 | 244 | 153 | 153 | 153 | 153 | 153 | 153 | 585 | 808 | 808 |
Best forecast wave conditions in Chiba | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
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