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 am Sunday 14 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
23.0° C
(Which is slightly cooler than normal)How big are the waves at Siriu today?
The current surf forecast for Siriu at 11AM is: 0.8m 9s primary swell from a South-southeast direction and 0.8m 6s secondary swell from a East-northeast direction (forecast issued at 08:00am December 14). The wind direction is predicted to be onshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (14 Dec) | 3ft (0.9m) | 9s |
| Afternoon (14 Dec) | 2.5ft (0.8m) | 9s |
| Evening (14 Dec) | 2.5ft (0.7m) | 10s |
Table - waves today at Siriu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sunday 14 | Monday 15 | Tuesday 16 | Wed 17 | |||||||||||||||||||||
| 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 | 9 PM | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 7 | 7 | 7 | 9 | 10 | 7 | 9 | 10 | 7 | 7 | 8 | 8 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 139 | 139 | 113 | 110 | 113 | 94 | 96 | 98 | 98 | 98 | 76 | 100 | 57 | 56 | 58 | 46 | 62 | 31 | 47 | 295 | 349 | 403 | 671 | 594 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | on | on | on | cross- on | cross- on | cross | cross | cross- on | cross- on | cross- on | cross- on | cross | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 10:53AM 0.51 | 11:14PM 0.57 | 11:05AM 0.54 | 12:03AM 0.62 | 11:32AM 0.55 | 12:42AM 0.67 | ||||||||||||||||||
Low Tide / height (m) | 4:19AM 0.29 | 4:43PM 0.30 | 5:18AM 0.30 | 5:27PM 0.22 | 6:11AM 0.30 | 6:06PM 0.16 | ||||||||||||||||||
Sunday 14 | Monday 15 | Tuesday 16 | Wed 17 | |||||||||||||||||||||
| Sunrise | 5:11 | - | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - |
| Sunset | - | - | - | - | 7:06 | - | - | - | - | - | - | - | 7:06 | - | - | - | - | - | - | - | 7:07 | - | - | - |
 | | | | |  | |  |  | | | |  |  |  |  | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | 3 | 1 | - | - | - | - | - | - | - | - | - |
| Temp. °C | 22 | 24 | 25 | 25 | 23 | 23 | 23 | 22 | 22 | 25 | 27 | 26 | 25 | 24 | 23 | 23 | 22 | 23 | 21 | 22 | 22 | 21 | 20 | 19 |
| Feels °C (?) | 24 | 26 | 26 | 27 | 26 | 26 | 26 | 24 | 24 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 23 | 21 | 17 | 19 | 20 | 19 | 19 | 17 |
- 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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