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:
Niyodo Rivermouth surfForecast / Shikoku / Japan
48hr Weather and Surf, issued 2 am Monday 15 Dec 2025 JSTForecast update in hr min s Forecast update imminent
Niyodo Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Niyodo Rivermouth sea temperature is
20.0° C
(Which is normal for this time of year)How big are the waves at Niyodo Rivermouth today?
The current surf forecast for Niyodo Rivermouth at 4AM is: 0.7m 11s primary swell from a East direction and 0.3m 7s secondary swell from a South direction (forecast issued at 02:00am December 15). An open ocean swell of 0.6m 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 (15 Dec) | 2.5ft (0.8m) | 10s |
| Afternoon (15 Dec) | 2.5ft (0.7m) | 10s |
| Evening (15 Dec) | 2ft (0.6m) | 9s |
Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 15 | Tuesday 16 | Wednesday 17 | ||||||||||||||||||||||
| 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 | 12 PM | 3 PM | 6 PM | 9 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    | |||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 39 | 85 | 139 | 128 | 107 | 81 | 80 | 59 | 58 | 56 | 41 | 39 | 38 | 30 | 29 | 28 | 28 | 27 | 26 | 26 | 16 | 16 | 16 | 16 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | off | off | off | glass | glass | glass | cross- off | off | off | off | off | glass | glass | on | glass | off |
High Tide / height (m) | 3:15AM 1.37 | 2:26PM 1.53 | 4:12AM 1.46 | 3:05PM 1.56 | 4:56AM 1.55 | 3:43PM 1.59 | ||||||||||||||||||
Low Tide / height (m) | 8:33AM 0.98 | 9:24PM 0.51 | 9:30AM 1.01 | 10:03PM 0.40 | 10:16AM 1.01 | |||||||||||||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | ||||||||||||||||||||||
| Sunrise | - | - | - | 7:01 | - | - | - | - | - | - | - | 7:01 | - | - | - | - | - | - | - | 7:01 | - | - | - | - |
| Sunset | - | - | - | - | - | 4:58 | - | - | - | - | - | - | - | 4:58 | - | - | - | - | - | - | - | 4:59 | - | - |
 | | |  | | | | | | | | | | | | | | | |  | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 7 | 6 | 6 | 7 | 10 | 11 | 8 | 6 | 6 | 5 | 5 | 7 | 11 | 12 | 10 | 8 | 8 | 8 | 8 | 11 | 14 | 14 | 14 | 12 |
| Feels °C (?) | 3 | 2 | 2 | 3 | 6 | 7 | 3 | 2 | 2 | 1 | 1 | 4 | 8 | 9 | 7 | 5 | 5 | 5 | 5 | 9 | 12 | 11 | 12 | 9 |
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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