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:
Prainha surfForecast / Rio Grande Do Sul / Brazil
48hr Weather and Surf, issued 8 am Sunday 21 Dec 2025 -03Forecast update in hr min s Forecast update imminent
Prainha surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Prainha sea temperature is
23.6° C
(Which is normal for this time of year)How big are the waves at Prainha today?
The current surf forecast for Prainha at 11AM is: 0.3m 13s primary swell from a South-southeast direction and 0.3m 11s secondary swell from a South direction (forecast issued at 08:00am December 21). An open ocean swell of 1.4m 7s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Dec) | 1ft (0.3m) | 11s |
| Afternoon (21 Dec) | 1.5ft (0.4m) | 13s |
| Evening (21 Dec) | 1ft (0.3m) | 12s |
Table - waves today at Prainha. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sunday 21 | Monday 22 | Tuesday 23 | Wed 24 | |||||||||||||||||||||
| 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 | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 12 | 11 | 13 | 13 | 12 | 12 | 11 | 11 | 11 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 26 | 21 | 34 | 56 | 28 | 25 | 21 | 21 | 20 | 8 | 8 | 7 | 7 | 6 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross | cross- on | cross- on | cross- on | cross- on | cross | cross- off | cross | glass | on | cross- off | glass | cross- on | cross | cross | cross- off | cross | cross- on | glass | cross | glass | glass | glass |
High Tide / height (m) | 1:01PM 0.46 | 2:21AM 0.49 | 6:18AM 0.45 | 1:35PM 0.49 | 2:52AM 0.47 | 7:19AM 0.45 | 2:11PM 0.50 | |||||||||||||||||
Low Tide / height (m) | 9:30AM 0.26 | 9:16PM -0.02 | 4:51AM 0.44 | 10:06AM 0.27 | 10:00PM -0.03 | 5:12AM 0.42 | 10:46AM 0.28 | 10:47PM -0.03 | ||||||||||||||||
Sunday 21 | Monday 22 | Tuesday 23 | Wed 24 | |||||||||||||||||||||
| Sunrise | 5:16 | - | - | - | - | - | - | - | 5:16 | - | - | - | - | - | - | - | 5:16 | - | - | - | - | - | - | - |
| Sunset | - | - | - | - | 7:17 | - | - | - | - | - | - | - | 7:17 | - | - | - | - | - | - | - | 7:19 | - | - | - |
 |  |  | | |  | | | | |  |  | |  | |  | | | | | |  | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | 3 | 3 | 2 | 1 | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 20 | 25 | 28 | 26 | 24 | 23 | 23 | 22 | 22 | 24 | 25 | 23 | 24 | 23 | 23 | 22 | 23 | 28 | 29 | 26 | 25 | 24 | 24 | 24 |
| Feels °C (?) | 19 | 25 | 27 | 27 | 26 | 25 | 26 | 24 | 24 | 27 | 28 | 26 | 28 | 25 | 26 | 24 | 24 | 30 | 30 | 30 | 29 | 28 | 28 | 28 |
- 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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