Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Mera surfForecast / Chiba / Japan
48hr Weather and Surf, issued 8 am Thursday 18 Dec 2025 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
20.2° C
(Which is slightly warmer than usual)How big are the waves at Mera today?
The current surf forecast for Mera at 3PM is: 0.5m 6s primary swell from a Southwest direction (forecast issued at 08:00am December 18). An open ocean swell of 0.4m 16s is not directed at the surf break, a second open ocean swell of 0.8m 8s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Dec) | 2ft (0.6m) | 6s |
| Afternoon (18 Dec) | 1.5ft (0.5m) | 6s |
| Evening (18 Dec) | 1.5ft (0.4m) | 6s |
Table - waves today at Mera. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 18 | Friday 19 | Saturday 20 | Sun 21 | |||||||||||||||||||||
| 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 10 | 10 | 11 | 5 | 5 | 11 | 11 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 47 | 32 | 32 | 19 | 14 | 10 | 6 | 10 | 10 | 11 | 17 | 14 | 11 | 11 | 71 | 73 | 64 | 61 | 86 | 179 | 256 | 272 | 300 | 297 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | off | cross- off | off | off | off | off | off | cross- off | cross | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on |
High Tide / height (m) | 4:32AM 1.29 | 2:32PM 1.40 | 5:08AM 1.33 | 3:08PM 1.42 | 5:42AM 1.36 | 3:43PM 1.43 | ||||||||||||||||||
Low Tide / height (m) | 9:16AM 0.95 | 9:53PM 0.08 | 9:58AM 0.94 | 10:27PM 0.03 | 10:36AM 0.94 | 11:01PM -0.01 | ||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sun 21 | |||||||||||||||||||||
| Sunrise | - | 6:41 | - | - | - | - | - | - | - | 6:41 | - | - | - | - | - | - | - | 6:43 | - | - | - | - | - | - |
| Sunset | - | - | - | 4:30 | - | - | - | - | - | - | - | 4:30 | - | - | - | - | - | - | - | 4:31 | - | - | - | - |
 |  | |  |  | | | |  | |  | | |  | | | | | |  | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 | - | - | - | - | 1 | 2 | 2 | 1 | 2 |
| Temp. °C | 10 | 10 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 12 | 14 | 16 | 16 | 16 | 17 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 20 |
| Feels °C (?) | 3 | 3 | 4 | 6 | 7 | 8 | 8 | 8 | 8 | 7 | 9 | 12 | 14 | 12 | 10 | 10 | 12 | 11 | 13 | 14 | 13 | 12 | 13 | 14 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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