Nazare Big Wave Challenge Gets Yellow Alert, Could Run Saturday in Giant Waves
70-foot plus waves predicted for Portuguese big wave tow surfing competition.
Surf Forecasts:
Mera surfForecast / Chiba / Japan
48hr Weather and Surf, issued 2 pm Sunday 14 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
20.0° C
(Which is normal for this time of year)How big are the waves at Mera today?
The current surf forecast for Mera at 9PM is: 4.0m 9s primary swell from a West-southwest direction and 2.0m 10s secondary swell from a South-southeast direction (forecast issued at 02:00pm December 14). An open ocean swell of 0.2m 14s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (14 Dec) | - | - |
| Afternoon (14 Dec) | 11ft (3.5m) | 10s |
| Evening (14 Dec) | 13ft (4.0m) | 9s |
Table - waves today at Mera. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sunday 14 | Monday 15 | Tuesday 16 | Wednesday 17 | |||||||||||||||||||||
| 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 | 6 AM | 9 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 10 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 6 | 7 | 7 | 7 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1255 | 2434 | 1731 | 2759 | 2410 | 1797 | 1831 | 591 | 370 | 202 | 188 | 136 | 78 | 50 | 45 | 35 | 34 | 24 | 24 | 85 | 204 | 191 | 163 | 356 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- on | cross- on | cross- on | cross- on | cross- on | cross- off | cross- off | cross- off | off | off | off | off | off | cross- off | cross- off | cross- off | glass | on | cross- on | cross- on | cross- on | cross- off | cross- off |
High Tide / height (m) | 11:54AM 1.26 | 1:56AM 1.05 | 12:34PM 1.30 | 3:03AM 1.14 | 1:14PM 1.33 | 3:52AM 1.22 | ||||||||||||||||||
Low Tide / height (m) | 7:18PM 0.52 | 6:29AM 0.86 | 8:04PM 0.38 | 7:33AM 0.92 | 8:42PM 0.26 | 8:29AM 0.94 | ||||||||||||||||||
Sunday 14 | Monday 15 | Tuesday 16 | Wednesday 17 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | - | 6:39 | - | - | - | - | - | - | - | 6:39 | - | - | - | - | - | - | - | 6:41 |
| Sunset | - | 4:30 | - | - | - | - | - | - | - | 4:30 | - | - | - | - | - | - | - | 4:30 | - | - | - | - | - | - |
 |  |  | | | | |  | | | |  |  | | |  | | | | | | | | | |
Rain (mm) | 17 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 10 | 12 | 14 | 13 | 12 | 11 | 11 | 12 | 12 | 13 | 12 | 11 | 10 | 9 | 9 | 9 | 10 | 11 | 12 | 12 | 11 | 11 | 11 | 11 |
| Feels °C (?) | 3 | 7 | 1 | 1 | -1 | 1 | 6 | 8 | 8 | 8 | 6 | 4 | 3 | 2 | 2 | 4 | 6 | 9 | 9 | 8 | 7 | 7 | 8 | 8 |
- 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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