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 2 pm Saturday 13 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
22.9° C
(Which is slightly cooler than normal)How big are the waves at Siriu today?
The current surf forecast for Siriu at 6PM is: 1.1m 10s primary swell from a South-southeast direction and 0.4m 8s secondary swell from a East-northeast direction, 0.6m 5s secondary swell from a East-northeast direction (forecast issued at 02:00pm December 13). The wind direction is predicted to be cross-onshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Dec) | - | - |
| Afternoon (13 Dec) | 3.5ft (1.1m) | 10s |
| Evening (13 Dec) | 3.5ft (1.0m) | 10s |
Table - waves today at Siriu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| 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 | 6 AM | 9 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 7 | 10 | 10 | 7 | 7 | 8 | 7 | 7 | 9 | 7 | 7 | 10 | 7 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 275 | 235 | 235 | 196 | 192 | 157 | 139 | 113 | 113 | 113 | 90 | 94 | 96 | 121 | 135 | 110 | 108 | 139 | 58 | 66 | 64 | 46 | 33 | 32 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | cross- on | cross- on | cross- on | on | on | cross- on | cross- on | on | on | cross- on | cross | cross- off | cross | cross- on | cross- on | cross- on | cross | cross- off | glass | glass | cross- off | cross- off |
High Tide / height (m) | 11:27AM 0.50 | 8:49PM 0.52 | 10:53AM 0.51 | 11:14PM 0.57 | 11:05AM 0.54 | 12:03AM 0.62 | ||||||||||||||||||
Low Tide / height (m) | 3:52PM 0.38 | 4:19AM 0.29 | 4:43PM 0.30 | 5:18AM 0.30 | 5:27PM 0.22 | 6:11AM 0.30 | ||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - |
| Sunset | - | - | 7:05 | - | - | - | - | - | - | - | 7:06 | - | - | - | - | - | - | - | 7:06 | - | - | - | - | - |
 | | |  | |  |  | | | | |  | | | | | |  | |  |  | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 7 | 2 | - | - | 1 |
| Temp. °C | 26 | 26 | 24 | 22 | 22 | 22 | 22 | 23 | 25 | 25 | 24 | 23 | 23 | 22 | 22 | 26 | 28 | 26 | 26 | 24 | 23 | 23 | 22 | 21 |
| Feels °C (?) | 27 | 27 | 26 | 25 | 25 | 24 | 24 | 25 | 27 | 27 | 26 | 26 | 26 | 24 | 23 | 27 | 28 | 27 | 27 | 28 | 27 | 27 | 20 | 19 |
- 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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