Sao Conrado seasonal overview
Best Surf Season (May - August)
During the Southern Hemisphere winter, Sao Conrado comes alive with consistent, long-period swell from the South Atlantic. The combination of strong extratropical storms roaring through the 'Roaring Forties' sends powerful S and SSE groundswells up the coast, producing average wave heights of 1.4 to 1.5m with periods exceeding 10 seconds. Coupled with the highest percentages of offshore wind from the north quadrant (often over 50% ideal conditions), this is when the beach truly fires. Expect clean, powerful lines wrapping into the bay, offering rippable walls and occasional pumping sets.
Fair Surf Season (March - April, September - October)
The shoulder seasons offer a mixed bag. As the seasons transition, the South Atlantic low-pressure tracks become less consistent. March and April still see decent swell, often with longer periods (10+ seconds), but the wind quality becomes more variable with an increase in easterly trade winds. September and October show a decline in ideal wind percentages (to around 37-42%), but remaining swell energy from winter storms can still produce fun, good-sized waves, especially when a strong cold front aligns with clean northwesterly winds.
Low Surf Season (November - February)
The Brazilian summer brings smaller, less consistent surf to Sao Conrado. Average wave heights drop to around 1.1-1.3m with shorter periods (9-10 seconds) as the South Pacific storm track weakens. Dominant ESE to SE winds often create bumpy, onshore conditions, though occasional pulses of S swell can sneak in. The mornings are your best bet, as light offshore breezes from the interior can temporarily groom the waves before the afternoon sea breeze kicks in. It's groveling territory, but still fun for a longboard or a high-performance shortboard when a summer swell aligns.
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Conditions at Sao Conrado in December
December: Summer Kickoff
December marks the start of summer officially. Swell averages remain low at 1.1m with 9.7s period, but the ideal wind percentage ticks up to 45% compared to the previous months. The trade winds still prevail from the east, but lighter morning land breezes offer more frequent clean sessions. The dominant swell is from the SSE and S, providing small but fun waves in the waist-high range. It's a month for high-performance surfing on the grovelers and having fun with the consistent, if not punchy, waves. Keep an eye on the forecast for any late-season cold fronts that could bring a southern hemi swell to finish the year.
Average Spot conditions at Sao Conrado in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Sao Conrado during December. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Sao Conrado for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sao Conrado for December. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Sao Conrado.
