Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Praia de Sao Marcos surfForecast / Maranhao / Brazil
48hr Weather and Surf, issued 8 pm Saturday 20 Dec 2025 -03Forecast update in hr min s Forecast update imminent
Praia de Sao Marcos surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Praia de Sao Marcos sea temperature is
28.0° C
(Which is slightly warmer than usual)How big are the waves at Praia de Sao Marcos today?
The current surf forecast for Praia de Sao Marcos at 2AM is: 1.1m 5s primary swell from a Northeast direction and 0.1m 19s secondary swell from a North direction (forecast issued at 08:00pm December 20). The wind direction is predicted to be cross-onshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Dec) | 3.5ft (1.0m) | 10s |
| Afternoon (21 Dec) | 2.5ft (0.8m) | 10s |
| Evening (21 Dec) | 2.5ft (0.7m) | 9s |
Table - waves today at Praia de Sao Marcos. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sat 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||||||||||
| 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) (?) | 10 | 10 | 4 | 5 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 4 | 5 | 5 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 130 | 157 | 43 | 49 | 217 | 192 | 160 | 130 | 125 | 85 | 83 | 117 | 52 | 99 | 81 | 29 | 29 | 118 | 30 | 43 | 42 | 33 | 29 | 30 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross- off | cross- off | on | cross- on | cross | cross- on | on | cross- on | cross- on | cross- on | cross | cross | cross- off | cross- off | cross | cross- off | cross- off | off |
High Tide / height (m) | 7:27PM 5.70 | 7:55AM 5.70 | 8:04PM 5.76 | 8:33AM 5.73 | 8:42PM 5.77 | 9:12AM 5.71 | ||||||||||||||||||
Low Tide / height (m) | 1:38AM 0.87 | 1:56PM 1.18 | 2:16AM 0.80 | 2:35PM 1.13 | 2:56AM 0.77 | |||||||||||||||||||
Sat 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||||||||||
| Sunrise | - | - | - | - | 5:47 | - | - | - | - | - | - | - | 5:47 | - | - | - | - | - | - | - | 5:48 | - | - | - |
| Sunset | 6:01 | - | - | - | - | - | - | - | 6:02 | - | - | - | - | - | - | - | 6:02 | - | - | - | - | - | - | - |
 |  | |  |  |  | | |  | | | |  | | | | | | | | | | | | |
Rain (mm) | - | - | - | 2 | 6 | 11 | 8 | 7 | 1 | - | - | - | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 1 | - |
| Temp. °C | 27 | 27 | 27 | 26 | 25 | 25 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 25 | 27 | 27 | 26 | 25 | 25 | 24 | 24 | 23 | 24 | 26 |
| Feels °C (?) | 28 | 28 | 29 | 28 | 27 | 28 | 26 | 26 | 26 | 28 | 28 | 28 | 27 | 28 | 29 | 28 | 28 | 27 | 28 | 27 | 26 | 25 | 27 | 29 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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