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 am Friday 12 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 4PM is: 0.6m 11s primary swell from a East direction (forecast issued at 08:00am December 12). An open ocean swell of 0.5m 7s is not directed at the surf break, a second open ocean swell of 0.5m 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
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) (?) | 10 | 10 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 12 | 12 | 11 | 8 | 8 | 11 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 75 | 48 | 89 | 88 | 86 | 54 | 52 | 53 | 54 | 37 | 69 | 72 | 71 | 89 | 85 | 116 | 118 | 66 | 66 | 61 | 46 | 88 | 150 | 173 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | off | off | off | off | off | off | on | on | glass | off | cross | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | off | cross- off |
High Tide / height (m) | 12:08PM 1.50 | 12:13AM 1.30 | 12:58PM 1.49 | 1:55AM 1.30 | 1:44PM 1.50 | |||||||||||||||||||
Low Tide / height (m) | 5:12AM 0.66 | 6:31PM 0.89 | 6:16AM 0.81 | 7:43PM 0.77 | 7:27AM 0.92 | 8:40PM 0.64 | ||||||||||||||||||
Friday 12 | Saturday 13 | Sunday 14 | Mon 15 | |||||||||||||||||||||
| Sunrise | - | 6:58 | - | - | - | - | - | - | - | 6:58 | - | - | - | - | - | - | - | 7:00 | - | - | - | - | - | - |
| Sunset | - | - | - | 4:57 | - | - | - | - | - | - | - | 4:57 | - | - | - | - | - | - | - | 4:58 | - | - | - | - |
 |  | | |  | | | | |  | | |  | | |  | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 4 | - | - | - | - | - | - | - |
| Temp. °C | 11 | 9 | 10 | 9 | 6 | 4 | 3 | 3 | 3 | 7 | 10 | 11 | 9 | 9 | 11 | 11 | 11 | 13 | 11 | 11 | 8 | 7 | 6 | 6 |
| Feels °C (?) | 6 | 3 | 4 | 2 | 0 | -1 | -2 | -1 | -1 | 3 | 7 | 8 | 7 | 6 | 9 | 9 | 9 | 9 | 4 | 4 | 3 | 3 | 2 | 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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