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 Knap surfForecast / Wales – South East / UK
48hr Weather and Surf, issued 11 pm Wednesday 10 Dec 2025 GMTForecast update in hr min s Forecast update imminent
Today's The Knap sea temperature is
9.3° C
(Which is 2.2°C colder than average for this time of year)How big are the waves at The Knap today?
The current surf forecast for The Knap at 6AM is: 0.6m 14s primary swell from a West direction and 0.3m 3s secondary swell from a South-southwest direction (forecast issued at 11:00pm December 10). The wind direction is predicted to be onshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 1.5ft (0.5m) | 13s |
| Afternoon (11 Dec) | 2ft (0.6m) | 12s |
| Evening (11 Dec) | 2.5ft (0.7m) | 14s |
Table - waves today at The Knap. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 11 | Friday 12 | Saturday 13 | ||||||||||||||||||||||
| 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) (?) | 11 | 11 | 14 | 14 | 13 | 13 | 12 | 14 | 14 | 14 | 14 | 15 | 15 | 14 | 18 | 18 | 18 | 17 | 17 | 16 | 16 | 15 | 15 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 94 | 94 | 104 | 134 | 87 | 81 | 108 | 198 | 198 | 147 | 163 | 167 | 109 | 146 | 314 | 227 | 222 | 217 | 207 | 188 | 126 | 186 | 222 | 128 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- off | cross | cross | cross | cross- on | cross- on | on | on | on | on | on | on | on |
High Tide / height (m) | 10:50PM 9.59 | 11:15AM 9.77 | 11:48PM 9.00 | 12:16PM 9.20 | 12:54AM 8.59 | 1:24PM 8.84 | ||||||||||||||||||
Low Tide / height (m) | 4:50AM 2.83 | 5:28PM 2.96 | 5:48AM 3.37 | 6:31PM 3.41 | 6:54AM 3.74 | |||||||||||||||||||
Thursday 11 | Friday 12 | Saturday 13 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 8:07 | - | - | - | - | - | - | - | 8:07 | - | - | - | - | - | - | - | 8:08 | - | - | - |
| Sunset | - | - | - | - | - | - | 4:04 | - | - | - | - | - | - | - | 4:04 | - | - | - | - | - | - | - | 4:04 | - |
 | | |  |  |  | |  |  | | | | | | | | | | | |  | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | 1 | - | 2 | 5 | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 9 | 9 | 9 | 9 | 9 | 12 | 11 | 11 | 11 | 11 | 11 | 9 | 8 | 9 | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 10 | 10 | 10 |
| Feels °C (?) | 5 | 6 | 5 | 5 | 4 | 6 | 6 | 6 | 6 | 8 | 8 | 3 | 2 | 4 | 7 | 6 | 5 | 5 | 5 | 4 | 3 | 4 | 3 | 3 |
- 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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