when is national sisters day

National Sisters Day is celebrated every year on the first Sunday in August in the United States, so the exact calendar date changes from year to year.

Key dates

• Recurring pattern: First Sunday in August each year.

• Examples:
  • 2025: August 3

* 2026: August 2

Quick scoop on the day

• It’s meant to celebrate the unique bond between sisters, including biological, adopted, and “like-a-sister” friends.

• Many people mark it with calls, messages, small gifts, or get‑togethers, often sharing photos and memories on social media using hashtags like #NationalSistersDay.

Information gathered from public forums or data available on the internet and portrayed here.