It's like this all year, every season is springtime in Medellin. We;re near the equator but we're almost a mile high in a breezy valley between the mountains.
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So weather is never a concern here. The rainstorms that are shown for the last few nights have been in the middle of the night freshening everything up.
So if you want to come do not worry about heat or cold. There ain't none. You might need a light jacket in the evening.