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 Saturday 13 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
25.0° C
(Which is normal for this time of year)How big are the waves at Maresias today?
The current surf forecast for Maresias at 5PM is: 1.0m 10s primary swell from a South direction (forecast issued at 02:00pm December 13). An open ocean swell of 0.2m 7s is not directed at the surf break, a second open ocean swell of 0.6m 4s is not directed at the surf break. The wind direction is predicted to be cross-shore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Dec) | - | - |
| Afternoon (13 Dec) | 3.5ft (1.0m) | 10s |
| Evening (13 Dec) | 3.5ft (1.0m) | 10s |
Table - waves today at Maresias. (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 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 242 | 202 | 202 | 198 | 161 | 161 | 133 | 133 | 131 | 128 | 96 | 92 | 90 | 42 | 40 | 40 | 86 | 42 | 77 | 75 | 72 | 49 | 48 | 48 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | glass | cross- off | cross- off | off | off | off | glass | on | glass | glass | cross- off | cross- off | glass | glass | glass | on | cross- on | cross- off | cross- off | cross- off | off | off | cross- off |
High Tide / height (m) | 10:15AM 0.75 | 10:06PM 0.79 | 11:15AM 0.78 | 11:46PM 0.86 | 11:54AM 0.82 | 12:38AM 0.93 | ||||||||||||||||||
Low Tide / height (m) | 4:14PM 0.51 | 4:49AM 0.42 | 5:11PM 0.41 | 5:46AM 0.41 | 5:59PM 0.32 | 6:36AM 0.39 | ||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 5:07 | - | - | - | - | - | - | - | 5:09 | - | - | - | - | - | - | - | 5:09 | - |
| Sunset | - | - | 6:43 | - | - | - | - | - | - | - | 6:44 | - | - | - | - | - | - | - | 6:45 | - | - | - | - | - |
 |  |  |  |  |  | | | | | | |  | |  | | | | |  | | | | | |
Rain (mm) | - | - | 1 | 8 | - | - | - | - | 1 | 2 | - | - | 2 | - | - | - | 1 | 3 | 4 | 1 | - | - | - | - |
| Temp. °C | 28 | 30 | 26 | 23 | 23 | 23 | 24 | 27 | 28 | 27 | 26 | 24 | 24 | 24 | 24 | 29 | 29 | 29 | 26 | 25 | 25 | 26 | 26 | 30 |
| Feels °C (?) | 31 | 33 | 30 | 24 | 26 | 25 | 27 | 30 | 31 | 31 | 31 | 28 | 26 | 28 | 28 | 33 | 33 | 34 | 30 | 29 | 28 | 30 | 29 | 33 |
- 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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