I was looking at a map of historic hurricane travel the other day and noticed that South America doesn't really get them. Florida gets a lot of hurricanes. Texas gets them too. It also occurred to me that Florida gets a lot of thunderstorms. Using weather patterns as a primary criteria, would South America be an ideal place to launch rockets?
Bad weather much milder than hurricanes and thunderstorms can still stop a launch. As described in this answer and probably several others, even a bit of lightning in the distance can stop a launch, as well as a bit of wind on the ground, or stronger winds at higher altitudes. Even something simple like visibility is discussed in this answer and probably others as well.
From this answer I received a link to the image below. There's no info on wind, but clear days (meaning no storms at least) are maximum on the west coast, which may offer some limited opportunities for polar launches but no over-the-ocean prograde (eastward) launches to modest inclinations.
The East coast has plenty of places for both eastward (low inclination) and southerly launches (polar) so yes, I think you might find good launch sites there, but you'll need to find a location with plenty of low wind days.
Then you will have to build the infrastructure for fueling, and either transporting or building the rockets locally.