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:
St Agnes surfForecast / Cornwall (North) / UK
48hr Weather and Surf, issued 11 pm Tuesday 16 Dec 2025 GMTForecast update in hr min s Forecast update imminent
St Agnes surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's St Agnes sea temperature is
12.0° C
(Which is slightly warmer than usual)How big are the waves at St Agnes today?
The current surf forecast for St Agnes at 6AM is: 2.2m 14s primary swell from a West direction and 1.9m 6s secondary swell from a Southwest direction (forecast issued at 11:00pm December 16). The wind direction is predicted to be cross-offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 6ft (1.9m) | 13s |
| Afternoon (17 Dec) | 10ft (3.0m) | 12s |
| Evening (17 Dec) | 13ft (4.0m) | 12s |
Table - waves today at St Agnes. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| 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 | 6 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 14 | 14 | 14 | 13 | 13 | 12 | 12 | 12 | 23 | 21 | 21 | 20 | 19 | 19 | 18 | 18 | 18 | 18 | 17 | 17 | 16 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 2898 | 2651 | 2766 | 1770 | 1266 | 2416 | 2426 | 2579 | 4475 | 2108 | 19899 | 28523 | 27135 | 25490 | 21116 | 18205 | 17296 | 15403 | 18189 | 16725 | 13238 | 11987 | 10475 | 8980 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross- off | off | cross- off | glass | cross- off | cross- on | cross- on | cross | cross | cross | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 3:06AM 5.13 | 3:27PM 5.18 | 3:48AM 5.34 | 4:07PM 5.35 | 4:26AM 5.54 | 4:45PM 5.50 | ||||||||||||||||||
Low Tide / height (m) | 9:03PM 1.53 | 9:27AM 1.47 | 9:46PM 1.36 | 10:08AM 1.27 | 10:25PM 1.19 | 10:47AM 1.09 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 8:15 | - | - | - | - | - | - | - | 8:15 | - | - | - | - | - | - | - | 8:15 | - | - | - |
| Sunset | - | - | - | - | - | - | 4:17 | - | - | - | - | - | - | - | 4:17 | - | - | - | - | - | - | - | 4:17 | - |
 | |  |  |  | | |  | | | | |  |  | | | | | | |  | | |  | |
Rain (mm) | - | - | - | - | 1 | 3 | 4 | 3 | 3 | 1 | - | - | 7 | 11 | 3 | 1 | - | - | - | - | - | - | - | 1 |
| Temp. °C | 8 | 8 | 9 | 10 | 10 | 10 | 11 | 12 | 12 | 12 | 11 | 11 | 10 | 10 | 11 | 10 | 10 | 9 | 9 | 10 | 10 | 10 | 10 | 10 |
| Feels °C (?) | 5 | 4 | 3 | 2 | 1 | 1 | 2 | 4 | 6 | 7 | 7 | 9 | 8 | 9 | 6 | 1 | 3 | 2 | 2 | 3 | 4 | 3 | 4 | 5 |
- 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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