In the U.S., the main widely recognized holiday in September is Labor Day, which falls on the first Monday of the month each year.

Other notable September observances (U.S.)

  • Patriot Day (September 11) – remembrance of the 2001 attacks.
  • Grandparents’ Day – usually the first Sunday after Labor Day.
  • Various awareness and cultural observances run all month (for example, several health and cause-awareness months).

If you tell me your country or region, I can narrow this to the specific September holiday that’s most relevant to you. Information gathered from public forums or data available on the internet and portrayed here.