If there is an Achilles’ heel to Brazil’s wine growing regions, it is the humidity. While many regions suffer through with 20 or 30 inches of rain a year, Serra Gaucha, the region that includes Bento Goncalves and the wine growing regions, often receives over 70 inches of rainfall per year. How do they handle it? With luck and ingenuity, mostly.
The luck would fall to the ground as it happens. That basaltic soil can be quite porous, allowing for easy drainage of much of the rain, particularly on the steeply sloping hillsides.