September 23 Holidays & Observances
3 holidays observed on September 23 in the 2026–2030 window.
Floating holidays on September 23
These observances only land on September 23 in certain years.
| Holiday | 2026 | 2027 | 2028 | 2029 | 2030 |
|---|---|---|---|---|---|
| Autumn Equinox | Sep 23 · Wed | Sep 23 · Thu | — | — | — |
View all September holidays
See every observance across September in one monthly calendar.
September calendar →September 23 — quick answers
- How many holidays fall on September 23?
- In the 2026–2030 window, 3 holidays and observance fall on September 23: Autumn Equinox, International Day of Sign Languages, Saudi National Day.
- What is celebrated on September 23?
- September 23 is home to Autumn Equinox, International Day of Sign Languages, Saudi National Day. Each one has its own page with history and a live countdown.
- Are any September 23 holidays public holidays?
- None of the observances on September 23 are US federal holidays; they are celebrated informally by people, brands and communities.