Fall Equinox 2025: Start Dates, Clock Changes, and What to Expect

Meteorological fall, defined by consistent temperature patterns, starts on September 1st and lasts until November 30th. This differs from astronomical fall, which is determined by the Earth's and sun's positions. The autumnal equinox on September 22nd marks the moment the Sun crosses the celestial equator, resulting in nearly equal daylight and darkness. After the equinox, days become shorter until the winter solstice on December 21st.

In the UK, the clocks go back one hour at 2 a.m. on the final Sunday of October (October 26th), returning to Greenwich Mean Time (GMT). This adjustment maximizes daylight hours during the summer months, although its benefits are debated.

Meteorological fall is based on temperature patterns and starts on September 1st, while astronomical fall is based on the Earth's position relative to the sun, starting with the autumnal equinox.

In the US, clocks go back on November 2nd. In the UK, clocks go back on October 26th.

The autumnal equinox is when the Sun crosses the celestial equator, resulting in nearly equal amounts of daylight and darkness.

Understanding the different markers of the fall season helps you prepare for changing weather patterns and adjust your routines accordingly. Knowing when to expect shorter days and cooler temperatures allows for better planning of outdoor activities and energy usage. Remember to set your clocks back on November 2nd (US) or October 26th (UK) and stay updated on weather forecasts for potential storms.

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