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 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
20.5° 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 1AM is: 0.6m 11s primary swell from a East direction and 0.2m 13s secondary swell from a East direction, 0.6m 4s secondary swell from a East-southeast direction (forecast issued at 08:00pm December 13). The wind direction is predicted to be glassy.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (14 Dec) | 2.5ft (0.7m) | 12s |
| Afternoon (14 Dec) | 1.5ft (0.4m) | 11s |
| Evening (14 Dec) | 1ft (0.3m) | 11s |
Table - waves today at Niyodo Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sat 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| 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) (?) | 12 | 11 | 11 | 11 | 11 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 71 | 89 | 85 | 85 | 87 | 129 | 129 | 40 | 39 | 22 | 23 | 116 | 177 | 140 | 109 | 107 | 81 | 80 | 60 | 60 | 59 | 59 | 56 | 54 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | cross- off | cross- off | glass | 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 | off | off | off | glass | glass | glass |
High Tide / height (m) | 1:55AM 1.30 | 1:44PM 1.50 | 3:15AM 1.37 | 2:26PM 1.53 | 4:12AM 1.46 | |||||||||||||||||||
Low Tide / height (m) | 7:43PM 0.77 | 7:27AM 0.92 | 8:40PM 0.64 | 8:33AM 0.98 | 9:24PM 0.51 | 9:30AM 1.01 | ||||||||||||||||||
Sat 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 7:00 | - | - | - | - | - | - | - | 7:01 | - | - | - | - | - | - | - | 7:01 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:58 | - | - | - | - | - | - | - | 4:58 | - | - | - | - | - | - | - | 4:58 |
 |  | | | |  |  | |  | | | | | | | | | | | | | | | | |
Rain (mm) | - | 1 | - | 2 | 5 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 10 | 9 | 11 | 11 | 12 | 11 | 11 | 11 | 9 | 7 | 7 | 6 | 5 | 8 | 10 | 11 | 8 | 6 | 6 | 6 | 5 | 7 | 11 | 12 |
| Feels °C (?) | 8 | 7 | 9 | 10 | 10 | 6 | 5 | 5 | 5 | 3 | 3 | 2 | 1 | 4 | 6 | 8 | 3 | 2 | 3 | 2 | 1 | 4 | 8 | 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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