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:
Siriu surfForecast / Santa Catarina – Sul / Brazil
48hr Weather and Surf, issued 8 pm Wednesday 10 Dec 2025 -03Forecast update in hr min s Forecast update imminent
Siriu surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Siriu sea temperature is
22.7° C
(Which is 1.0°C colder than average for this time of year)How big are the waves at Siriu today?
The current surf forecast for Siriu at 12AM is: 1.5m 10s primary swell from a South direction and 1.4m 10s secondary swell from a East-northeast direction (forecast issued at 08:00pm December 10). The wind direction is predicted to be offshore and the swell rating is 3.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 8ft (2.5m) | 12s |
| Afternoon (11 Dec) | 10ft (3.0m) | 12s |
| Evening (11 Dec) | 8ft (2.5m) | 12s |
Table - waves today at Siriu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wed 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| 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 | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |   |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 10 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 435 | 459 | 417 | 1200 | 1902 | 1954 | 2196 | 2196 | 2010 | 1805 | 1440 | 1152 | 990 | 798 | 743 | 631 | 551 | 460 | 388 | 307 | 258 | 214 | 175 | 175 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | off | off | off | cross- off | cross | cross- on | glass | cross- off | cross- off | cross- off | cross- off | cross- on | on | cross- on | cross | cross | cross- off | cross | cross | cross | cross- on | cross- on |
High Tide / height (m) | 4:10PM 0.63 | 6:20AM 0.47 | 11:26AM 0.54 | 5:08PM 0.59 | 11:39AM 0.52 | 6:27PM 0.54 | 11:27AM 0.50 | |||||||||||||||||
Low Tide / height (m) | 1:08AM 0.20 | 7:42AM 0.46 | 1:55PM 0.51 | 2:12AM 0.24 | 2:54PM 0.45 | 3:17AM 0.27 | ||||||||||||||||||
Wed 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| Sunrise | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - | - | - |
| Sunset | 7:02 | - | - | - | - | - | - | - | 7:04 | - | - | - | - | - | - | - | 7:04 | - | - | - | - | - | - | - |
 |  |  |  |  | | | | | | | | | | |  | | | | | | |  | | |
Rain (mm) | 2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - |
| Temp. °C | 21 | 22 | 21 | 20 | 20 | 24 | 27 | 26 | 24 | 22 | 21 | 20 | 20 | 25 | 27 | 26 | 24 | 22 | 22 | 22 | 21 | 22 | 22 | 23 |
| Feels °C (?) | 22 | 23 | 20 | 19 | 19 | 22 | 26 | 24 | 25 | 23 | 22 | 20 | 19 | 25 | 27 | 26 | 25 | 23 | 23 | 21 | 20 | 21 | 23 | 23 |
- 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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