Brazil experiences sharp day‑night temperature swings and dry heat across several states

In Mato Grosso do Sul, mornings were cold with minima as low as 6.3 °C in Rio Brilhante, while afternoons rose to 33 °C in Corumbá and surrounding areas, prompting health warnings about low humidity and heightened fire risk. In São Paulo’s Araras, temperatures started near 10 °C before climbing to a maximum of 24 °C under clear skies. Cuiabá saw cloudy mornings with temperatures between 20 °C and 30 °C, followed by forecasts of up to 36 °C and humidity dropping to 20 % later in the week. The Acre state received its seventh polar wave of the year, bringing rain to all municipalities and breaking an 18‑day dry spell; rainfall totals topped 135 mm in Mâncio Lima, while temperatures are expected to stay between 30 °C and 33 °C. Other cities such as Araguari, various towns in Mato Grosso and many localities across Brazil were forecast to have sunny, dry conditions with highs ranging from 26 °C to 36 °C and very low humidity, increasing the need for hydration and fire‑prevention measures. Across the regions, the common themes were clear skies, significant diurnal temperature ranges, low humidity, and advisories to avoid excessive sun exposure and outdoor fires.