How Many Days Until First Day of Autumn?

The countdown to First Day of Autumn in detail

There are currently 30 days until First Day of Autumn on Tuesday, 22 September 2026. That works out to about 4 weeks, roughly 1.0 months, or 720 hours. Counting only weekdays (Monday to Friday), around 21 business days remain.

The countdown counts the full days from tomorrow — the day already underway is not included. The calculation accounts for leap years and Daylight Saving Time changes, so the day count to First Day of Autumn stays exact. Use the “Add to calendar” button to save the date as an .ics file in Google Calendar, Apple Calendar or Outlook.