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:
The Rivermouth surfForecast / CAL – Santa Cruz / USA
48hr Weather and Surf, issued 3 pm Thursday 11 Dec 2025 PSTForecast update in hr min s Forecast update imminent
The Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's The Rivermouth sea temperature is
13.7° C
(Which is slightly warmer than usual)How big are the waves at The Rivermouth today?
The current surf forecast for The Rivermouth at 10PM is: 1.7m 15s primary swell from a West-northwest direction and 0.3m 13s secondary swell from a South direction (forecast issued at 03:00pm December 11). The wind direction is predicted to be cross-offshore and the swell rating is 3.
| Time (PST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | - | - |
| Afternoon (11 Dec) | 5.5ft (1.7m) | 15s |
| Evening (11 Dec) | 5.5ft (1.7m) | 15s |
Table - waves today at The Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 11 | Friday 12 | Saturday 13 | Sunday 14 | |||||||||||||||||||||
| 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 15 | 15 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1191 | 1307 | 1324 | 1273 | 1074 | 1045 | 980 | 850 | 815 | 651 | 547 | 538 | 447 | 440 | 323 | 254 | 203 | 199 | 183 | 145 | 150 | 150 | 103 | 96 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | glass | glass | glass | cross- off | cross- off | cross- off | cross- off | glass | glass | cross- on | glass | glass | glass | cross- off | cross- off | cross |
High Tide / height (m) | 3:11PM 1.16 | 5:10AM 1.50 | 4:48PM 1.01 | 5:46AM 1.54 | 6:40PM 0.98 | 6:18AM 1.58 | ||||||||||||||||||
Low Tide / height (m) | 10:19AM 0.75 | 9:48PM 0.25 | 11:31AM 0.57 | 10:40PM 0.42 | 12:30PM 0.38 | 11:32PM 0.59 | ||||||||||||||||||
Thursday 11 | Friday 12 | Saturday 13 | Sunday 14 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | - | 7:11 | - | - | - | - | - | - | - | 7:11 | - | - | - | - | - | - | - | 7:11 |
| Sunset | - | 4:51 | - | - | - | - | - | - | - | 4:51 | - | - | - | - | - | - | - | 4:51 | - | - | - | - | - | - |
 | |  | | | | | | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 20 | 19 | 16 | 16 | 15 | 15 | 15 | 18 | 21 | 20 | 17 | 16 | 16 | 15 | 15 | 17 | 19 | 17 | 15 | 14 | 14 | 14 | 14 | 17 |
| Feels °C (?) | 17 | 16 | 12 | 12 | 11 | 11 | 11 | 14 | 19 | 18 | 15 | 13 | 13 | 12 | 12 | 14 | 17 | 15 | 15 | 13 | 12 | 11 | 11 | 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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