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:
Valnäs - Nord Koster surfForecast / Kattegat and Skagerrack / Sweden
48hr Weather and Surf, issued 6 pm Saturday 13 Dec 2025 CETForecast update in hr min s Forecast update imminent
Valnäs - Nord Koster surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Valnäs - Nord Koster sea temperature is
7.7° C
(Which is 2.0°C warmer than normal for this time of year)| Time (CET) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (14 Dec) | 8ft (2.5m) | 7s |
| Afternoon (14 Dec) | 8ft (2.5m) | 8s |
| Evening (14 Dec) | 7.5ft (2.3m) | 7s |
Table - waves today at Valnäs - Nord Koster. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| 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 | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 6 | 5 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 9 | 9 | 6 | 8 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 31 | 100 | 136 | 0 | 0 | 0 | 704 | 801 | 717 | 589 | 558 | 704 | 875 | 0 | 0 | 0 | 0 | 0 | 0 | 76 | 103 | 0 | 44 | 0 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross | cross | cross- off | cross | cross | cross | cross | cross | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 12:49AM 0.24 | 1:06PM 0.29 | 1:33AM 0.24 | 1:50PM 0.29 | 2:14AM 0.24 | |||||||||||||||||||
Low Tide / height (m) | 6:38PM 0.03 | 6:28AM 0.04 | 7:23PM 0.03 | 7:10AM 0.05 | 8:00PM 0.05 | 7:48AM 0.05 | ||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 9:00 | - | - | - | - | - | - | - | 9:02 | - | - | - | - | - | - | - | 9:03 | - |
| Sunset | - | - | - | - | - | - | - | 3:18 | - | - | - | - | - | - | - | 3:18 | - | - | - | - | - | - | - | 3:18 |
 | |  |  |  | |  | | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | 1 | - | - | - | - | - | - | - | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 8 | 8 | 9 | 8 | 8 | 8 | 8 | 7 | 8 |
| Feels °C (?) | 1 | -2 | -2 | 0 | -1 | -1 | -2 | -2 | -1 | -2 | -1 | -2 | -1 | -1 | 0 | -1 | -1 | 0 | -1 | 0 | 0 | 0 | 0 | 1 |
- 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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