September 13 Holidays & Observances
2 holidays observed on September 13 in the 2026–2030 window.
Floating holidays on September 13
These observances only land on September 13 in certain years.
| Holiday | 2026 | 2027 | 2028 | 2029 | 2030 |
|---|---|---|---|---|---|
| National Grandparents Day | Sep 13 · Sun | — | — | — | — |
| Programmer's Day | Sep 13 · Sun | Sep 13 · Mon | — | Sep 13 · Thu | Sep 13 · Fri |
View all September holidays
See every observance across September in one monthly calendar.
September calendar →September 13 — quick answers
- How many holidays fall on September 13?
- In the 2026–2030 window, 2 holidays and observance fall on September 13: National Grandparents Day, Programmer's Day.
- What is celebrated on September 13?
- September 13 is home to National Grandparents Day, Programmer's Day. Each one has its own page with history and a live countdown.
- Are any September 13 holidays public holidays?
- None of the observances on September 13 are US federal holidays; they are celebrated informally by people, brands and communities.