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 Tuesday 16 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
19.3° C
(Which is slightly cooler than normal)How big are the waves at Niyodo Rivermouth today?
The current surf forecast for Niyodo Rivermouth at 12AM is: 0.4m 8s primary swell from a East-southeast direction and 0.1m 15s secondary swell from a East direction (forecast issued at 08:00pm December 16). The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 1.5ft (0.4m) | 8s |
| Afternoon (17 Dec) | 1.5ft (0.4m) | 8s |
| Evening (17 Dec) | 2.5ft (0.8m) | 5s |
Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | |||||||||||||||||||||
| 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) (?) | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 4 | 5 | 5 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 29 | 28 | 28 | 27 | 17 | 26 | 16 | 16 | 24 | 28 | 17 | 27 | 26 | 19 | 19 | 18 | 18 | 18 | 19 | 19 | 18 | 19 | 19 | 25 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | off | off | off | off | glass | glass | glass | cross- off | off | off | off | off | off | glass | cross- on | glass | off | off | off | glass | glass | glass | glass |
High Tide / height (m) | 3:05PM 1.56 | 4:56AM 1.55 | 3:43PM 1.59 | 5:33AM 1.62 | 4:20PM 1.63 | 6:08AM 1.67 | ||||||||||||||||||
Low Tide / height (m) | 10:03PM 0.40 | 10:16AM 1.01 | 10:39PM 0.30 | 10:56AM 1.00 | 11:14PM 0.22 | 11:32AM 0.99 | ||||||||||||||||||
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 7:01 | - | - | - | - | - | - | - | 7:03 | - | - | - | - | - | - | - | 7:03 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:59 | - | - | - | - | - | - | - | 4:59 | - | - | - | - | - | - | - | 4:59 |
 |  | | | |  | | | | | | | | | | | | | | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 11 | 9 | 8 | 8 | 8 | 10 | 12 | 14 | 13 | 12 | 10 | 10 | 8 | 9 | 13 | 14 | 12 | 10 | 9 | 9 | 8 | 10 | 13 | 15 |
| Feels °C (?) | 9 | 6 | 5 | 5 | 5 | 8 | 10 | 13 | 10 | 9 | 6 | 6 | 4 | 5 | 11 | 11 | 11 | 8 | 7 | 7 | 6 | 9 | 12 | 14 |
- 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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