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:
Praia das Dunas surfForecast / Rio de Janeiro / Brazil
48hr Weather and Surf, issued 8 pm Tuesday 16 Dec 2025 -03Forecast update in hr min s Forecast update imminent
Praia das Dunas surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Praia das Dunas sea temperature is
26.6° C
(Which is 1.9°C warmer than normal for this time of year)How big are the waves at Praia das Dunas today?
The current surf forecast for Praia das Dunas at 4AM is: 1.2m 8s primary swell from a East-northeast direction and 0.4m 10s secondary swell from a South-southeast direction (forecast issued at 08:00pm December 16). The wind direction is predicted to be offshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 3.5ft (1.1m) | 8s |
| Afternoon (17 Dec) | 2.5ft (0.8m) | 8s |
| Evening (17 Dec) | 2ft (0.6m) | 8s |
Table - waves today at Praia das Dunas. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | |||||||||||||||||||||
| 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) (?) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 186 | 372 | 347 | 163 | 172 | 146 | 89 | 69 | 45 | 44 | 132 | 132 | 75 | 66 | 47 | 74 | 61 | 49 | 49 | 40 | 31 | 31 | 28 | 40 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- on | cross | off | off | cross- off | cross- off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | glass | cross | cross | cross- on | on | on | on | on | on | cross- on |
High Tide / height (m) | 1:11AM 0.95 | 12:54PM 0.87 | 1:49AM 0.99 | 1:25PM 0.89 | 2:24AM 1.02 | 1:56PM 0.91 | ||||||||||||||||||
Low Tide / height (m) | 6:34PM 0.20 | 7:09AM 0.34 | 7:13PM 0.14 | 7:48AM 0.33 | 7:49PM 0.08 | 8:24AM 0.32 | ||||||||||||||||||
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | |||||||||||||||||||||
| Sunrise | - | - | - | - | 4:56 | - | - | - | - | - | - | - | 4:58 | - | - | - | - | - | - | - | 4:58 | - | - | - |
| Sunset | 6:29 | - | - | - | - | - | - | - | 6:30 | - | - | - | - | - | - | - | 6:30 | - | - | - | - | - | - | - |
 |  |  | | |  |  | | |  |  | |  | | | | | |  | | | | | | |
Rain (mm) | 1 | - | 1 | 1 | 1 | 2 | - | 1 | 1 | - | 1 | 1 | - | - | - | - | 2 | 3 | 1 | 1 | 1 | - | - | - |
| Temp. °C | 25 | 24 | 24 | 24 | 25 | 23 | 23 | 22 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 20 | 20 | 20 | 20 | 21 | 21 | 22 | 22 |
| Feels °C (?) | 28 | 27 | 28 | 24 | 27 | 21 | 21 | 20 | 21 | 22 | 22 | 22 | 21 | 22 | 24 | 23 | 21 | 22 | 21 | 21 | 22 | 21 | 22 | 21 |
- 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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