Meteo Armação dos Búzios in maggio

May is the local secret: 26°C, dry, the sea still warm, and Ipanema without the New Year crowd. Summer here (January) is a humid 38°C that flattens you before noon whatever the beach photos suggest.

Búzios' forum generally likes October - pleasant spring temperatures, mostly blue skies, and genuinely low crowds in the first half of the month before an October 12-15 holiday period brings a short price and crowd spike. One quirk worth knowing before picking a beach: the northern beaches (Tartaruga, Azeda, João Fernandes) catch warmer currents while the southern ones (Geribá, Tucuns) run noticeably colder, and an occasional cold-water upwelling from further south can chill things further. Posters treated this as normal, not a reason to avoid the month - just something to factor into which beach to pick.

Forum posters describe April daytime highs typically in the upper-70s to low-80sF (roughly 27-28C), cooling to a comfortable 70F (21C) at night - genuinely pleasant beach weather with lower humidity than the more oppressive summer months. Posters call April the tail end of high season rather than truly low season: prices have come down from peak, beaches are noticeably less crowded, but the town isn't dead either. Landing between Easter and Brazil's mid-April national holiday (the 21st), posters consistently name this as a strong sweet-spot window - cooler, drier, and quieter than peak summer, without yet losing all the energy of the high season crowd.