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 8 pm Thursday 11 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
20.5° 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 3AM is: 0.6m 10s primary swell from a East-southeast direction and 0.5m 5s secondary swell from a Southwest direction (forecast issued at 08:00pm December 11). An open ocean swell of 0.4m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Dec) | 1.5ft (0.5m) | 10s |
| Afternoon (12 Dec) | 2ft (0.6m) | 11s |
| Evening (12 Dec) | 1.5ft (0.5m) | 10s |
Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thu 11 | Friday 12 | Saturday 13 | Sunday 14 | |||||||||||||||||||||
| 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 | 12 PM | 3 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |   |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 11 | 12 | 12 | 11 | 11 | 11 | 11 | 12 | 12 | 11 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 90 | 85 | 80 | 78 | 75 | 47 | 89 | 88 | 86 | 55 | 52 | 53 | 54 | 56 | 59 | 103 | 101 | 89 | 85 | 116 | 121 | 66 | 42 | 40 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | cross- off | off | off | off | off | off | off | off | off | off | off | off | glass | on | glass | glass | off | glass | off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 10:36PM 1.38 | 12:08PM 1.50 | 12:13AM 1.30 | 12:58PM 1.49 | 1:55AM 1.30 | 1:44PM 1.50 | ||||||||||||||||||
Low Tide / height (m) | 5:10PM 0.97 | 5:12AM 0.66 | 6:31PM 0.89 | 6:16AM 0.81 | 7:43PM 0.77 | 7:27AM 0.92 | ||||||||||||||||||
Thu 11 | Friday 12 | Saturday 13 | Sunday 14 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 6:58 | - | - | - | - | - | - | - | 6:58 | - | - | - | - | - | - | - | 7:00 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:57 | - | - | - | - | - | - | - | 4:57 | - | - | - | - | - | - | - | 4:58 |
 |  | | | |  | | | | | | |  | | |  |  | | | |  | | | | |
Rain (mm) | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 | 5 | 2 | - | - | - |
| Temp. °C | 14 | 13 | 13 | 10 | 9 | 7 | 9 | 10 | 6 | 4 | 3 | 3 | 4 | 7 | 11 | 11 | 10 | 9 | 11 | 11 | 12 | 12 | 11 | 11 |
| Feels °C (?) | 12 | 11 | 10 | 6 | 4 | 1 | 3 | 4 | 0 | -1 | -2 | -1 | 0 | 4 | 8 | 9 | 8 | 7 | 10 | 9 | 10 | 7 | 4 | 4 |
- 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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