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Brazil's forum notes March generally brings less rain than February across the southeast, with warm sunny days and a storm more likely at the end of the day than sustained through it. Campos do Jordão itself doesn't come up much in these broader threads, but its mountain elevation is the key difference from the Rio and São Paulo weather posters usually discuss - expect noticeably cooler days and genuinely chilly nights here even when the coast is still running hot, since altitude does more to shape this town's climate than the calendar month.

Regulars are specific that this city's own elevation, roughly 700-800 metres up in the mountains, is why its weather can genuinely differ from the beach towns just an hour's drive away - one visitor recalls an overcast, drizzly beach day locals still called too cold, weather they themselves found perfectly fine. Our row backs the mild, changeable read, 27.3C reading as 28C over 16.5C nights, with 47mm of rain across 6.7 days. Regulars describe this as a genuinely pleasant, breezy month for the city itself, with the real caveat that comfort is relative - what feels fine to an outsider may not match a local's own baseline for the season. The record: humidity 74 percent, 9.4 hours of sun, a 17.2 kph wind and AQI 104.

May is among the least rainy months of this city's year and the boards say so plainly - a different proposition from the November-to-February wet season. Our row agrees at 42.7mm across 6.3 days. Their temperatures are 22 to 25C by day and 17 to 19C at night; ours run 24.6C and 15.7C, so the evenings are a degree or two cooler than they promise and the layer still matters, especially indoors where heating is not standard. The coast an hour away is past its season but not cold. Sun is modest at 8.5 hours inside 11 of daylight. The record: humidity 79 percent, a 15.1 kph wind and AQI 87.

Winter here rarely rains and regulars put the days near 25C and the nights much lower, which our 23.4C over 14.6C brackets, with 44mm across 5.8 days. What they warn about is not the temperature but the buildings: central heating is not standard, so a cool evening indoors stays cool, and a light coat plus the sort of clothes you would wear for a northern autumn is the packing list rather than summer things. The other winter cost is in our air column at AQI 88, the season when still cool air holds the city's traffic in place. Daylight is short for a place this close to the tropics at 10.7 hours, and the sun manages 8 of them. The record: humidity 79 percent and a 14.7 kph wind.

Sao Paulo-forum threads on winter weather describe August plainly: it rarely rains this time of year, days climb into the mid-20s but nights drop closer to 10C, and more than one poster calls the city genuinely chilly once the sun goes down - not the tropical Brazil visitors picture. It's the driest part of the year by a clear margin. The record backs that with real numbers rather than just the 'rarely' framing: 24.5C days feeling like 23C, 14.1C nights, 49mm across 6.1 days and 8.4 hours of sun, the least sunshine of any month on this destination's calendar. An AQI of 85 is also worth knowing before packing - inversion season in a valley city does what the postcard version of Sao Paulo winter doesn't mention.