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:
Big River surfForecast / CAL – Mendocino County / USA
48hr Weather and Surf, issued 9 pm Sunday 14 Dec 2025 PSTForecast update in hr min s Forecast update imminent
Big River surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Big River sea temperature is
13.0° C
(Which is slightly warmer than usual)How big are the waves at Big River today?
The current surf forecast for Big River at 3AM is: 0.8m 9s 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 cross-offshore.
| Time (PST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Dec) | 2.5ft (0.8m) | 9s |
| Afternoon (15 Dec) | 3ft (0.9m) | 11s |
| Evening (15 Dec) | 5.5ft (1.7m) | 10s |
Table - waves today at Big River. (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) (?) | 10 | 10 | 10 | 9 | 9 | 9 | 14 | 11 | 11 | 10 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 159 | 153 | 148 | 110 | 103 | 101 | 70 | 191 | 452 | 706 | 1365 | 1699 | 1820 | 1610 | 1447 | 1324 | 1204 | 1113 | 1113 | 1013 | 911 | 1039 | 1019 | 1005 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | glass | cross- off | glass | cross | glass | glass | glass | glass | glass | glass | glass | glass | cross- off | on | cross- on | on | cross- on | on | on | cross | cross- off | cross | cross- off |
High Tide / height (m) | 8:17PM 1.15 | 7:26AM 1.80 | 9:25PM 1.19 | 7:58AM 1.83 | 10:18PM 1.24 | 8:31AM 1.86 | ||||||||||||||||||
Low Tide / height (m) | 12:49AM 0.77 | 2:41PM 0.15 | 1:32AM 0.87 | 3:20PM 0.03 | 2:15AM 0.95 | 3:56PM -0.06 | ||||||||||||||||||
Sun 14 | Monday 15 | Tuesday 16 | Wednesday 17 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 7:26 | - | - | - | - | - | - | - | 7:28 | - | - | - | - | - | - | - | 7:28 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:52 | - | - | - | - | - | - | - | 4:52 | - | - | - | - | - | - | - | 4:52 |
 | |  | | |  | | | | | | | | |  |  |  | | | | |  | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 9 | 4 | 2 | 1 | 2 | - | - | - | - |
| Temp. °C | 9 | 10 | 10 | 11 | 13 | 13 | 16 | 16 | 17 | 15 | 16 | 16 | 16 | 17 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 13 | 11 |
| Feels °C (?) | 8 | 9 | 7 | 10 | 10 | 11 | 14 | 15 | 17 | 15 | 16 | 17 | 17 | 18 | 16 | 16 | 15 | 14 | 14 | 15 | 13 | 13 | 10 | 8 |
- 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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