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:
Itaipu surfForecast / Rio de Janeiro / Brazil
48hr Weather and Surf, issued 2 am Tuesday 16 Dec 2025 -03Forecast update in hr min s Forecast update imminent
Itaipu surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Itaipu sea temperature is
26.2° C
(Which is 1.6°C warmer than normal for this time of year)How big are the waves at Itaipu today?
The current surf forecast for Itaipu at 6AM is: 0.5m 9s primary swell from a South-southeast direction (forecast issued at 02:00am December 16). An open ocean swell of 0.4m 7s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Dec) | 1.5ft (0.5m) | 9s |
| Afternoon (16 Dec) | 1.5ft (0.4m) | 9s |
| Evening (16 Dec) | 1.5ft (0.5m) | 10s |
Table - waves today at Itaipu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 16 | Wednesday 17 | Thursday 18 | ||||||||||||||||||||||
| 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 | 9 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    | |||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 5 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 11 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 69 | 66 | 48 | 44 | 50 | 26 | 52 | 52 | 37 | 38 | 38 | 73 | 249 | 684 | 336 | 291 | 417 | 381 | 227 | 227 | 221 | 194 | 248 | 337 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross | cross- off | cross- off | cross | cross | glass | on | on | on | cross- on | cross- on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross- off | cross- off |
High Tide / height (m) | 11:36AM 0.95 | 12:47AM 1.01 | 11:37AM 0.95 | 1:21AM 1.01 | 11:57AM 0.96 | |||||||||||||||||||
Low Tide / height (m) | 5:26AM 0.07 | 5:46PM -0.09 | 6:10AM 0.08 | 6:28PM -0.14 | 6:53AM 0.10 | 7:10PM -0.16 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | ||||||||||||||||||||||
| Sunrise | - | - | 5:01 | - | - | - | - | - | - | - | 5:01 | - | - | - | - | - | - | - | 5:01 | - | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:32 | - | - | - | - | - | - | - | 6:34 | - | - | - | - | - | - | - | 6:34 | - |
 | |  | | |  | |  | |  |  | | | | |  | |  | | |  | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | 3 | 4 | 3 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | - | - | - | - | - |
| Temp. °C | 25 | 25 | 24 | 28 | 28 | 28 | 27 | 26 | 25 | 24 | 25 | 23 | 22 | 22 | 22 | 23 | 23 | 22 | 22 | 23 | 23 | 22 | 22 | 22 |
| Feels °C (?) | 28 | 29 | 26 | 31 | 30 | 30 | 31 | 29 | 27 | 26 | 25 | 21 | 20 | 21 | 22 | 23 | 23 | 22 | 22 | 24 | 24 | 22 | 23 | 23 |
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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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