The climatological winter is closing in the Greater Buenos Aires area (AMBA) with marked instability giving way to a new polar air intrusion. ^[1] The coldest day of the event will be Sunday, September 6, with a real minimum temperature of 3°C in Buenos Aires City and sub-zero temperatures in various sectors of the Greater Buenos Aires area. ^[2] The National Meteorological Service (SMN) forecast heavy rains for Guadalajara and the state of Jalisco on Monday, August 31, 2026, coinciding with the start of the school year. ^[3] Temperatures exceeded 20°C over the weekend before a radical change in the weather scenario combining rain, intense winds, and a strong thermal drop. ^[4] The transition to winter climate began on Monday, August 31, the last day of winter from the meteorological point of view. ^[5] Starting at 17:00 hours, the probability of precipitation was forecast to reach 90 percent with winds from the west reaching up to 31 kilometers per hour. ^[6] The SMN predicted rainfall accumulations between 50 and 75 millimeters, primarily affecting the eastern, central, and western regions of Jalisco. ^[7] The SMN warned that the storms could cause increased river levels, landslides, puddles, and flooding in vulnerable areas of the city. ^[8] On September 1, 2026, the Buenos Aires Metropolitan Area (AMBA) will experience a break from rain with partly cloudy skies and temperatures between 10°C and 18°C, with possible morning fog affecting visibility. ^[9] On September 2, 2026, temperatures will reach a peak of 22°C in the AMBA, and a cold front will bring rain and isolated storms, according to Meteored Argentina. ^[10] On September 6, 2026, the coldest day of the week, Buenos Aires will see minimum temperatures of 3°C, with possible frosts in the conurbano, and afternoon northeast winds will raise maximums to 12-13°C. ^[11]