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Conditions at Grumari in October
October: Spring Wind vs. Groundswell
October remains a transitional month. Average wave height eases to 3.5ft (1.1m), period drops slightly to 10.1s, and the percentage of ideal wind falls to its annual low of 31%. The swell directions are still excellent, with SSE 28.8%, S 27.7%, SE 23.1% and ESE 15.7%, and there are still enough 3-5ft (1-1.5m) waves to keep things surfable. But the wind tables explain the quality problem: E (15.1%), ENE (14.7%), ESE (10.1%) and NE (8.5%) combine for a persistent onshore/easterly regime that puts a lot of chop on the surface. You need to pick your moments, preferably early morning before the spring sea breeze fills in. Rain increases to 3.95 mm/day, air temperatures warm to 22.8°C, and water temperature is still cool at 20.2°C.
Average Spot conditions at Grumari in October
Swell history for October
Wind history for October
Swell quality
Analyze the groundswell consistency at Grumari during October. 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 Grumari for your next trip in October.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Grumari for October. 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 Grumari.