Conditions at Grupuk in January
January: Clean Monsoon Windows
January sits at the heart of the wet season, and while the average swell height drops to around 4-5ft (1.4m), the longer 12.6s period keeps the energy in the water. Swell direction is dominated by SSW (40%) and SW (56%), with most energy arriving in the fun to solid 3-5ft range - ideal for the south-facing reefs at Grupuk. The wind story is much better than the rest of the year: offshore and cross-offshore flows from WNW, W, NW and NNW contribute to roughly 50% ideal conditions. Tropical downpours (8.1mm/day) and water temperatures of 29.3°C keep the air humid, but the persistent W-WNW flow grooms the southwest groundswell into clean, ridable lines. This is one of the best windows for quality surf at Grupuk.
Average Spot conditions at Grupuk in January
Swell history for January
Wind history for January
Swell quality
Analyze the groundswell consistency at Grupuk 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 Grupuk for your next trip in January.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Grupuk 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 Grupuk.