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:
Maresias surfForecast / São Paulo / Brazil
48hr Weather and Surf, issued 2 am Thursday 11 Dec 2025 -03Forecast update in hr min s Forecast update imminent
Maresias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Maresias sea temperature is
25.1° C
(Which is slightly warmer than usual)How big are the waves at Maresias today?
The current surf forecast for Maresias at 10AM is: 0.8m 5s primary swell from a West-southwest direction and 0.3m 11s secondary swell from a South direction (forecast issued at 02:00am December 11). An open ocean swell of 0.7m 10s is not directed at the surf break. The wind direction is predicted to be cross-shore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 2.5ft (0.8m) | 5s |
| Afternoon (11 Dec) | 2.5ft (0.8m) | 14s |
| Evening (11 Dec) | 7ft (2.1m) | 12s |
Table - waves today at Maresias. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 11 | Friday 12 | Saturday 13 | ||||||||||||||||||||||
| 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) (?) | 12 | 11 | 5 | 5 | 6 | 14 | 12 | 12 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 46 | 43 | 38 | 35 | 52 | 232 | 1025 | 1379 | 1468 | 1430 | 1385 | 1190 | 1022 | 872 | 632 | 536 | 526 | 440 | 372 | 305 | 247 | 244 | 194 | 194 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross | cross- on | on | glass | cross- off | cross- off | cross- off | off | glass | cross- on | glass | glass | off | off | cross- off | cross- off | cross- off | cross- off | glass | cross- on | cross- off |
High Tide / height (m) | 7:00AM 0.76 | 6:22PM 0.86 | 8:12AM 0.73 | 7:44PM 0.80 | 10:15AM 0.75 | |||||||||||||||||||
Low Tide / height (m) | 1:23AM 0.31 | 1:51PM 0.63 | 2:33AM 0.38 | 3:06PM 0.58 | 3:43AM 0.41 | 4:14PM 0.51 | ||||||||||||||||||
Thursday 11 | Friday 12 | Saturday 13 | ||||||||||||||||||||||
| Sunrise | - | - | 5:07 | - | - | - | - | - | - | - | 5:07 | - | - | - | - | - | - | - | 5:07 | - | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:42 | - | - | - | - | - | - | - | 6:43 | - | - | - | - | - | - | - | 6:43 | - |
 | |  | | | | | | | | | | |  |  |  | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 3 | 1 | 2 | - | 1 | - | - | 1 | 2 |
| Temp. °C | 28 | 27 | 26 | 29 | 30 | 28 | 27 | 23 | 23 | 23 | 24 | 30 | 32 | 28 | 25 | 23 | 22 | 23 | 23 | 24 | 26 | 26 | 24 | 24 |
| Feels °C (?) | 27 | 26 | 26 | 28 | 28 | 29 | 29 | 24 | 23 | 23 | 25 | 31 | 33 | 31 | 28 | 26 | 25 | 25 | 25 | 26 | 29 | 30 | 28 | 26 |
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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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