Overview

• Argentina’s Servicio de Hidrografía Naval sets the equinox at 15:19 HOA on Monday, corresponding to 18:19 UTC.
• Peru’s Senamhi marks spring’s start at 13:19 local time and forecasts sunnier Lima afternoons from September 22–26, with inland highs near 25 °C due to a weaker South Pacific Anticyclone and northerly winds.
• Spain’s Observatorio Astronómico Nacional/AEMET places the autumn start at 20:19 peninsular time on Monday, with media noting rapid daylight loss typical of early fall.
• Customary celebrations do not match the astronomical instant, with Argentina commonly observing September 21 and Peru celebrating the Day of Spring and Youth on September 23.
• Spain’s switch to standard time is scheduled for the night of October 25–26, when clocks move back from 03:00 to 02:00 in line with EU practice.