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:
Porthtowan surfForecast / Cornwall (North) / UK
48hr Weather and Surf, issued 11 pm Wednesday 10 Dec 2025 GMTForecast update in hr min s Forecast update imminent
Porthtowan surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Porthtowan sea temperature is
12.3° C
(Which is slightly warmer than usual)How big are the waves at Porthtowan today?
The current surf forecast for Porthtowan at 3AM is: 3.0m 14s primary swell from a West direction and 2.1m 11s secondary swell from a South-southwest direction (forecast issued at 11:00pm December 10). The wind direction is predicted to be cross-offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 11ft (3.5m) | 13s |
| Afternoon (11 Dec) | 15ft (4.5m) | 14s |
| Evening (11 Dec) | 15ft (4.5m) | 14s |
Table - waves today at Porthtowan. (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) (?) | 15 | 14 | 14 | 14 | 13 | 13 | 14 | 14 | 14 | 16 | 15 | 15 | 19 | 19 | 19 | 18 | 18 | 18 | 17 | 16 | 16 | 16 | 14 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 2831 | 5054 | 3750 | 2484 | 4177 | 4788 | 7533 | 8553 | 7749 | 9873 | 9165 | 8467 | 17325 | 20769 | 20021 | 18471 | 15731 | 13889 | 11152 | 8137 | 7073 | 6567 | 5792 | 5606 |
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 | on | on | on | cross- on | cross | cross- on | cross- on | cross | cross | cross | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 9:16PM 5.22 | 9:41AM 5.40 | 10:15PM 4.90 | 10:43AM 5.08 | 11:20PM 4.70 | 11:49AM 4.87 | ||||||||||||||||||
Low Tide / height (m) | 3:38AM 1.36 | 4:19PM 1.39 | 4:38AM 1.65 | 5:20PM 1.63 | 5:42AM 1.84 | |||||||||||||||||||
Thursday 11 | Friday 12 | Saturday 13 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 8:08 | - | - | - | - | - | - | - | 8:10 | - | - | - | - | - | - | - | 8:11 | - | - | - |
| Sunset | - | - | - | - | - | - | 4:16 | - | - | - | - | - | - | - | 4:16 | - | - | - | - | - | - | - | 4:16 | - |
 | |  | |  | |  |  |  |  |  | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | 1 | 11 | 6 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 11 | 10 | 11 | 11 | 11 | 12 | 12 | 12 | 10 | 10 | 9 | 9 | 10 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 11 |
| Feels °C (?) | 6 | 4 | 4 | 4 | 4 | 5 | 5 | 6 | 7 | 7 | 2 | 4 | 7 | 7 | 6 | 7 | 7 | 6 | 6 | 5 | 4 | 3 | 3 | 3 |
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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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