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 Saturday 13 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
20.3° 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: 0.5m 10s primary swell from a East direction (forecast issued at 02:00am December 13). An open ocean swell of 0.7m 7s is not directed at the surf break, a second open ocean swell of 0.3m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Dec) | 1.5ft (0.4m) | 10s |
| Afternoon (13 Dec) | 1.5ft (0.5m) | 12s |
| Evening (13 Dec) | 2ft (0.6m) | 11s |
Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | ||||||||||||||||||||||
| 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) (?) | 10 | 10 | 10 | 10 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 52 | 53 | 53 | 37 | 70 | 72 | 71 | 89 | 85 | 85 | 116 | 70 | 42 | 40 | 39 | 22 | 85 | 116 | 144 | 139 | 121 | 118 | 90 | 88 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | on | on | glass | cross- off | cross- on | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | glass | off | off |
High Tide / height (m) | 12:13AM 1.30 | 12:58PM 1.49 | 1:55AM 1.30 | 1:44PM 1.50 | 3:15AM 1.37 | 2:26PM 1.53 | ||||||||||||||||||
Low Tide / height (m) | 6:16AM 0.81 | 7:43PM 0.77 | 7:27AM 0.92 | 8:40PM 0.64 | 8:33AM 0.98 | |||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:58 | - | - | - | - | - | - | - | 7:00 | - | - | - | - | - | - | - | 7:01 | - | - | - | - |
| Sunset | - | - | - | - | - | 4:57 | - | - | - | - | - | - | - | 4:58 | - | - | - | - | - | - | - | 4:58 | - | - |
 | | |  | | |  |  | |  |  | | |  | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | 1 | 2 | 20 | 4 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 3 | 3 | 3 | 6 | 10 | 11 | 9 | 9 | 12 | 12 | 12 | 11 | 11 | 11 | 8 | 7 | 7 | 6 | 6 | 8 | 10 | 11 | 8 | 6 |
| Feels °C (?) | -2 | -1 | -1 | 2 | 7 | 8 | 7 | 7 | 10 | 10 | 9 | 6 | 5 | 5 | 4 | 3 | 3 | 2 | 2 | 4 | 7 | 8 | 3 | 2 |
- 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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