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 Monday 15 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
13.1° C
(Which is slightly warmer than usual)How big are the waves at Big River today?
The current surf forecast for Big River at 11PM is: 1.9m 11s primary swell from a West-northwest direction and 0.4m 13s secondary swell from a Southwest direction (forecast issued at 09:00pm December 15). The wind direction is predicted to be glassy and the swell rating is 3.
| Time (PST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Dec) | - | - |
| Afternoon (15 Dec) | - | - |
| 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
Mon 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | |||||||||||||||||||||
| 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 | 10 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 452 | 706 | 1248 | 1539 | 1652 | 1610 | 1447 | 1321 | 1207 | 1236 | 1236 | 1369 | 1344 | 1367 | 1347 | 963 | 1193 | 1474 | 1546 | 1400 | 778 | 596 | 595 | 452 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | glass | glass | glass | glass | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | glass | cross | cross | cross | glass | glass | glass | glass | cross | cross- on | cross- on | cross- on |
High Tide / height (m) | 9:25PM 1.19 | 7:58AM 1.83 | 10:18PM 1.24 | 8:31AM 1.86 | 11:03PM 1.28 | 9:05AM 1.88 | ||||||||||||||||||
Low Tide / height (m) | 1:32AM 0.87 | 3:20PM 0.03 | 2:15AM 0.95 | 3:56PM -0.06 | 2:56AM 0.99 | |||||||||||||||||||
Mon 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 7:28 | - | - | - | - | - | - | - | 7:28 | - | - | - | - | - | - | - | 7:28 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:52 | - | - | - | - | - | - | - | 4:52 | - | - | - | - | - | - | - | 4:52 |
 |  | | | |  | | |  | | | | |  |  | |  | | | | |  | | | |
Rain (mm) | - | - | - | - | - | 2 | 4 | 2 | 2 | 3 | 3 | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 16 | 14 | 15 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 14 | 15 | 13 | 12 | 11 | 10 | 9 | 9 | 10 | 12 | 14 | 14 | 15 |
| Feels °C (?) | 15 | 14 | 15 | 17 | 17 | 16 | 16 | 16 | 13 | 12 | 13 | 12 | 16 | 10 | 8 | 9 | 9 | 8 | 8 | 8 | 10 | 11 | 11 | 13 |
- 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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