The Autumn Equinox, occurring on September 22, 2025, at 5:20 AM PST, signifies the official start of fall. This astronomical event marks a point where day and night are nearly equal, leading to a gradual loss of daylight. In San Francisco, the change brings a mix of lingering summer warmth, known as Second Summer, while also indicating that sunsets will soon happen before 7 PM starting September 23. As the season progresses, residents can look forward to cozy outdoor activities despite an impending shift in the weather.
The Autumn Equinox on September 22, 2025, at 5:20 AM PST marks the official first day of fall, transitioning days and nights toward equal lengths.
As we reach the Autumn Equinox, expect to lose 2-3 minutes of sunlight per day, leading to earlier sunsets and longer nights.
Despite the arrival of fall, San Francisco often enjoys its warmest weeks in September, known as Second Summer, making the transition less abrupt.
September 23 will see sunsets dip before 7 PM, kicking off a seasonal shift that leads to winter’s early evening darkness.
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