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 pm Wednesday 10 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 5PM is: 0.3m 13s primary swell from a South-southeast direction and 0.6m 4s secondary swell from a West direction (forecast issued at 02:00pm December 10). An open ocean swell of 1.0m 9s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (10 Dec) | - | - |
| Afternoon (10 Dec) | 0.5ft (0.2m) | 13s |
| Evening (10 Dec) | 1.5ft (0.4m) | 12s |
Table - waves today at Maresias. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| 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) (?) | 14 | 13 | 12 | 12 | 12 | 11 | 11 | 6 | 6 | 14 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 16 | 17 | 50 | 48 | 46 | 43 | 38 | 54 | 72 | 236 | 1092 | 1335 | 1314 | 1318 | 1238 | 1065 | 1022 | 887 | 739 | 621 | 536 | 457 | 379 | 311 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross- on | on | glass | cross- off | cross- off | cross- off | off | glass | cross- on | cross- off | cross- off | cross- off | off | cross- off | cross- off | cross- off |
High Tide / height (m) | 5:25PM 0.92 | 7:00AM 0.76 | 6:22PM 0.86 | 8:12AM 0.73 | 7:44PM 0.80 | |||||||||||||||||||
Low Tide / height (m) | 12:42PM 0.64 | 1:23AM 0.31 | 1:51PM 0.63 | 2:33AM 0.38 | 3:06PM 0.58 | 3:43AM 0.41 | ||||||||||||||||||
Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 5:07 | - | - | - | - | - | - | - | 5:07 | - | - | - | - | - | - | - | 5:07 | - |
| Sunset | - | - | 6:40 | - | - | - | - | - | - | - | 6:42 | - | - | - | - | - | - | - | 6:43 | - | - | - | - | - |
 | | |  | | | | | | | | | | |  | | |  |  |  |  | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 9 | 16 | 1 | 3 | 1 | - |
| Temp. °C | 32 | 33 | 31 | 29 | 28 | 27 | 26 | 29 | 30 | 28 | 26 | 23 | 23 | 23 | 24 | 30 | 31 | 24 | 23 | 23 | 23 | 23 | 23 | 24 |
| Feels °C (?) | 32 | 32 | 32 | 29 | 27 | 26 | 27 | 28 | 29 | 29 | 28 | 23 | 23 | 23 | 25 | 32 | 32 | 27 | 25 | 25 | 26 | 27 | 26 | 27 |
- 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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