Holidays in September
Every holiday and observance falling in September, with the date this year and next. Dates are computed, not tabulated: the religious ones move against the Gregorian calendar and are resolved each year.
September 2026
| Holiday | Date | Type | Away |
|---|---|---|---|
| Labor Day | Mon, Sep 7 | Federal holiday | — |
| Patriot Day | Fri, Sep 11 | Observance | — |
| Rosh Hashanah | Sat, Sep 12 | Religious · Jewish | — |
| National Grandparents Day | Sun, Sep 13 | Observance | — |
| Yom Kippur | Mon, Sep 21 | Religious · Jewish | — |
| Mabon | Tue, Sep 22 | Religious · Pagan | — |
| Sukkot | Sat, Sep 26 | Religious · Jewish | — |
September 2027
| Holiday | Date | Type | Away |
|---|---|---|---|
| Labor Day | Mon, Sep 6 | Federal holiday | 303 days |
| Patriot Day | Sat, Sep 11 | Observance | 308 days |
| National Grandparents Day | Sun, Sep 12 | Observance | 309 days |
| Mabon | Thu, Sep 23 | Religious · Pagan | 320 days |
How these dates are worked out
Federal holidays come from 5 U.S.C. §6103, and are shown on the day they fall — a few are observed on an adjacent weekday when they land at the weekend. Observances close nothing and are shown for completeness.
Religious dates are computed rather than listed. Easter and everything hanging off it follow the Gregorian computus, with Orthodox dates on the Julian one. Jewish and Islamic dates resolve through the Hebrew and Umm al-Qura calendars — both begin at sunset the evening before the date shown, and Islamic observance in practice is set by local moon sighting, so a day either side is normal.
Hindu festivals are not listed. They are lunisolar and vary by region and by panchang, and there is no reliable way to compute them here — a guess would be worse than an absence.