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:
Itamambuca surfForecast / São Paulo / Brazil
48hr Weather and Surf, issued 2 am Wednesday 17 Dec 2025 -03Forecast update in hr min s Forecast update imminent
Itamambuca surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Itamambuca sea temperature is
25.3° C
(Which is slightly warmer than usual)How big are the waves at Itamambuca today?
The current surf forecast for Itamambuca at 8AM is: 1.4m 8s primary swell from a South-southeast direction and 0.8m 8s secondary swell from a South direction, 1.5m 7s secondary swell from a South-southwest direction (forecast issued at 02:00am December 17). The wind direction is predicted to be cross-onshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 4.5ft (1.4m) | 8s |
| Afternoon (17 Dec) | 4.5ft (1.3m) | 8s |
| Evening (17 Dec) | 3.5ft (1.1m) | 7s |
Table - waves today at Itamambuca. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| 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) (?) | 10 | 6 | 7 | 8 | 8 | 8 | 8 | 7 | 9 | 8 | 8 | 8 | 9 | 9 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 7 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 30 | 125 | 257 | 243 | 231 | 173 | 130 | 108 | 150 | 113 | 116 | 92 | 81 | 78 | 136 | 118 | 111 | 81 | 80 | 57 | 39 | 36 | 47 | 32 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross- on | cross | glass | glass | glass | glass | glass | glass | glass | glass | glass | cross- on | cross- on | cross- on | cross- on | cross | glass | glass | glass | on | cross- on | cross- on | cross- on |
High Tide / height (m) | 1:00PM 0.87 | 1:55AM 1.02 | 1:28PM 0.90 | 2:26AM 1.05 | 1:55PM 0.94 | |||||||||||||||||||
Low Tide / height (m) | 7:16AM 0.36 | 7:19PM 0.15 | 7:57AM 0.34 | 7:57PM 0.09 | 8:34AM 0.33 | 8:35PM 0.05 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| Sunrise | - | - | 5:07 | - | - | - | - | - | - | - | 5:09 | - | - | - | - | - | - | - | 5:09 | - | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:43 | - | - | - | - | - | - | - | 6:43 | - | - | - | - | - | - | - | 6:44 | - |
 | |  |  | | | |  | |  |  |  | |  | | | | | | | | | | | |
Rain (mm) | 17 | 73 | 5 | - | 1 | 1 | - | - | - | - | - | - | - | 1 | 1 | - | - | - | - | - | - | 1 | - | - |
| Temp. °C | 24 | 22 | 22 | 22 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 23 | 25 | 24 | 24 | 23 |
| Feels °C (?) | 28 | 21 | 22 | 24 | 22 | 24 | 24 | 23 | 23 | 23 | 23 | 24 | 25 | 25 | 25 | 24 | 25 | 25 | 25 | 26 | 28 | 27 | 27 | 25 |
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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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