Conditions at Sesimbra in December
December: Winter Classic
December brings midwinter power to the doorstep. Average surf is 6ft (1.8m) and the period is a strong 12.6s, putting Sesimbra firmly in the heart of surf season. The swell rose is still W/NW dominated, with WNW at 28%, NW at 26%, W at 11% and WSW at 5% all contributing, but the direct south-to-southwest quadrant also becomes a little more active, reaching around 4-5% of the total. Ideal wind is 45%, and cold fronts sweeping southwest of Portugal create westerly swell with offshore N/NE winds cleaning it up. Water temp is 15.6°C, air temps average 14°C, and rain is abundant at 2.7mm/day. December is a serious month: when the stars align, Sesimbra sees some of the best, most powerful waves of the year.
Average Spot conditions at Sesimbra in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Sesimbra 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 Sesimbra for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sesimbra 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 Sesimbra.