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 9 pm Sunday 14 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
13.8° C
(Which is 1.0°C warmer than normal for this time of year)How big are the waves at The Rivermouth today?
The current surf forecast for The Rivermouth at 2AM is: 0.6m 10s primary swell from a West direction and 0.4m 14s secondary swell from a Southwest direction (forecast issued at 09:00pm December 14). The wind direction is predicted to be offshore.
| Time (PST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Dec) | 2ft (0.6m) | 10s |
| Afternoon (15 Dec) | 2ft (0.6m) | 9s |
| Evening (15 Dec) | 1.5ft (0.5m) | 9s |
Table - waves today at The Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sun 14 | Monday 15 | Tuesday 16 | Wednesday 17 | |||||||||||||||||||||
| 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 | 1 PM | 4 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |   |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 14 | 10 | 10 | 10 | 14 | 14 | 13 | 9 | 8 | 16 | 10 | 10 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 86 | 54 | 72 | 69 | 68 | 61 | 57 | 45 | 38 | 35 | 66 | 184 | 306 | 672 | 748 | 855 | 942 | 942 | 933 | 918 | 819 | 819 | 714 | 702 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | cross- off | glass | off | cross- off | glass | cross- off | off | cross- off | off | cross- off | cross- off | glass | glass | cross | glass | glass | glass | glass | glass | glass | glass | glass | off |
High Tide / height (m) | 8:12PM 1.03 | 6:47AM 1.62 | 9:20PM 1.12 | 7:16AM 1.66 | 10:14PM 1.20 | 7:46AM 1.69 | ||||||||||||||||||
Low Tide / height (m) | 12:22AM 0.74 | 2:00PM 0.08 | 1:10AM 0.87 | 2:36PM -0.03 | 1:55AM 0.97 | 3:10PM -0.10 | ||||||||||||||||||
Sun 14 | Monday 15 | Tuesday 16 | Wednesday 17 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 7:13 | - | - | - | - | - | - | - | 7:13 | - | - | - | - | - | - | - | 7:13 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:52 | - | - | - | - | - | - | - | 4:52 | - | - | - | - | - | - | - | 4:52 |
 | |  | | |  |  | | | | | | | | | | | | |  | |  | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 11 | 11 | 12 | 12 | 13 | 16 | 20 | 19 | 17 | 16 | 15 | 15 | 15 | 17 | 19 | 19 | 17 | 16 | 17 | 16 | 16 | 17 | 20 | 19 |
| Feels °C (?) | 10 | 9 | 10 | 9 | 10 | 14 | 17 | 16 | 14 | 13 | 13 | 14 | 15 | 18 | 19 | 19 | 18 | 17 | 19 | 18 | 18 | 18 | 21 | 19 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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