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Date posted: Jun, 21, 2022
Based on my experience up and down the coast: Fortaleza has the most sun.
Anywhere at the latitude of Sao Paulo and southward gets cold in the winter.
Rio de Janeiro actually stays relatively warm even during the winter.
I'm a sun worshipper, so this question hold great significance for me. The reason the Ceara region has more sun that some of the areas slightly north of Ceara is because those parts get slightly more rain than Fortaleza. Of course, Fortaleza does have a rainy season, but it does not last long.