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 8 am Friday 12 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
20.9° C
(Which is 1.1°C warmer than normal for this time of year)How big are the waves at Mera today?
The current surf forecast for Mera at 3PM is: 0.5m 10s primary swell from a East direction and 0.7m 7s secondary swell from a West-southwest direction (forecast issued at 08:00am December 12). An open ocean swell of 1.0m 4s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Dec) | 3ft (0.9m) | 7s |
| Afternoon (12 Dec) | 1.5ft (0.5m) | 10s |
| Evening (12 Dec) | 2.5ft (0.7m) | 12s |
Table - waves today at Mera. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 12 | Saturday 13 | Sunday 14 | Mon 15 | |||||||||||||||||||||
| 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) (?) | 7 | 7 | 10 | 10 | 10 | 12 | 12 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 6 | 6 | 11 | 6 | 9 | 10 | 10 | 11 | 10 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 164 | 83 | 85 | 56 | 56 | 144 | 139 | 127 | 121 | 86 | 86 | 129 | 134 | 129 | 128 | 89 | 89 | 91 | 816 | 1261 | 1874 | 1906 | 1198 | 1494 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | cross- off | cross- off | cross- off | off | off | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | off | cross- off | cross- on | cross- on | cross- on | cross- on | cross- on |
High Tide / height (m) | 10:35AM 1.22 | 10:07PM 1.01 | 11:14AM 1.23 | 12:18AM 0.99 | 11:54AM 1.26 | 1:56AM 1.05 | ||||||||||||||||||
Low Tide / height (m) | 3:26AM 0.46 | 4:51PM 0.81 | 4:19AM 0.62 | 6:18PM 0.67 | 5:21AM 0.76 | 7:18PM 0.52 | ||||||||||||||||||
Friday 12 | Saturday 13 | Sunday 14 | Mon 15 | |||||||||||||||||||||
| Sunrise | - | 6:37 | - | - | - | - | - | - | - | 6:37 | - | - | - | - | - | - | - | 6:39 | - | - | - | - | - | - |
| Sunset | - | - | - | 4:29 | - | - | - | - | - | - | - | 4:29 | - | - | - | - | - | - | - | 4:30 | - | - | - | - |
 |  |  | | | |  |  | | | |  |  | | | | | | |  | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | 1 | 2 | 2 | 4 | - | 2 | 5 | 1 | 1 | - | - | - | - |
| Temp. °C | 9 | 8 | 8 | 9 | 7 | 6 | 6 | 5 | 5 | 6 | 7 | 8 | 10 | 12 | 10 | 9 | 9 | 10 | 10 | 11 | 14 | 13 | 13 | 12 |
| Feels °C (?) | -3 | -2 | -2 | -1 | -2 | -4 | -2 | -2 | -2 | 0 | 1 | 2 | 4 | 8 | 4 | 5 | 4 | 6 | 3 | 7 | 1 | 4 | 1 | 3 |
- 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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