Meteorological Fall 2026

We are now in the season called Meteorological Fall. It begins on September 1st and remains through September, October, and November. Meteorologists split seasons into clean, three-month blocks based on the annual temperature cycle to compare climate data easily.

Astronomical fall is based on the Earth's tilt and the September Equinox, which arrives later in the month on September 22.

Meteorological autumn is significant because it provides a fixed, consistent three-month block—from September 1 to November 30—that allows scientists and climatologists to accurately compare weather records from year to year.

Meterological Fall always starts on September 1 and ends on November 30 — unlike astronomical fall which shifts based on the equinox. It is a source for clean weather data.