September 15 Holidays & Observances
3 holidays observed on September 15 in the 2026–2030 window.
Floating holidays on September 15
These observances only land on September 15 in certain years.
| Holiday | 2026 | 2027 | 2028 | 2029 | 2030 |
|---|---|---|---|---|---|
| Mid-Autumn Festival | — | Sep 15 · Wed | — | — | — |
| International Red Panda Day | — | — | — | Sep 15 · Sat | — |
View all September holidays
See every observance across September in one monthly calendar.
September calendar →September 15 — quick answers
- How many holidays fall on September 15?
- In the 2026–2030 window, 3 holidays and observance fall on September 15: Mid-Autumn Festival, International Day of Democracy, International Red Panda Day.
- What is celebrated on September 15?
- September 15 is home to Mid-Autumn Festival, International Day of Democracy, International Red Panda Day. Each one has its own page with history and a live countdown.
- Are any September 15 holidays public holidays?
- None of the observances on September 15 are US federal holidays; they are celebrated informally by people, brands and communities.