Conditions at Rosa in January
January: Deep Summer Trade Winds and Soft Peaks
January is classic summer at Rosa. The wave rose is dominated by E (27%) and ESE (24%) swell, with a healthy 20% from ENE, but the average period sits at just 8.0s, keeping most surf in the short-period, punchy category. Average swell height is 4ft (1.2m), with the bulk of the E and ESE energy in the 2-5ft (0.5-1.5m) range and only a small fraction reaching 5-6ft (1.5-2m). You can find rippable, grovelly waves on the better sandbanks, but power and consistency are limited.
The wind story is less than ideal. NNE (20%) and NE (20%) trades dominate, often blowing cross-shore or alongshore, while true offshore flow from WSW-WNW appears only in small increments. With an ideal-wind score of just 24%, glassy conditions are the exception. Add in a warm water temperature of 25.1°C, air temperatures around 23.7°C and the highest rainfall of the year at 6.92 mm/day, and you have classic summer slop - best handled with an early paddle-out and a low expectations.
Average Spot conditions at Rosa in January
Swell history for January
Wind history for January
Swell quality
Analyze the groundswell consistency at Rosa during January. 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 Rosa for your next trip in January.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Rosa for January. 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 Rosa.