When does autumn begin in Mexico? The exact date and time of the equinox

Autumn arrives in central Mexico at 6:06 p.m. on Tuesday, September 22, according to the time conversion cited from astronomy site Star Walk. Globally, the Northern Hemisphere equinox occurs on September 23 at 00:06 UTC.

The equinox marks the point when the Sun sits directly over the celestial equator and sunlight spreads almost equally across both hemispheres. From then on, days in the Northern Hemisphere gradually become shorter, while nights gain minutes until the winter solstice.

In Mexico, the seasonal shift also coincides with regular cold fronts and polar air masses moving south from the north of the continent. Records from the National Meteorological Service of Mexico's National Water Commission indicate that temperatures decline in several central and northern regions.

The season also offers opportunities for skywatchers. NASA says planets including Jupiter and Saturn can be easier to identify with the naked eye during the first weeks of autumn. The National Astronomical Observatory of the National Autonomous University of Mexico recommends observing away from large urban areas and allowing at least 20 minutes for the eyes to adjust to the darkness.