18 September 2025

18 September 2025 is ...

• 261st day of the year. There are then 104 days left in 2025.
• 38th Thursday of 2025.
• on the 38th week of 2025 (using ISO standard week number calculation).
• 91st day of Summer. There are 4 days left till Fall.
• Birthstone for this day: Sapphire

18 September 2025 United Kingdom Holidays & Popular Observances

There are no major holidays or observances in the UK for this date.

18 September 2025 Popular Holidays & Observances Worldwide

• National Cheeseburger Day - Popular in: Canada, United States
• Chile Independence Day - United States
• Fiestas Patrias - Chile
• Dia da Independência do Chile - United States
• AIDS and Aging Awareness Day - United States