Public holidays
1909, Brasil, Piauí
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1909 | New Year's Day |
| 2 | Tuesday, 23 February 1909 | Carnival Tuesday |
| 3 | Friday, 9 April 1909 | Good Friday |
| 4 | Wednesday, 21 April 1909 | Tiradentes Day |
| 5 | Saturday, 1 May 1909 | Labour Day |
| 6 | Thursday, 10 June 1909 | Corpus Christi |
| 7 | Tuesday, 7 September 1909 | Independence Day |
| 8 | Tuesday, 12 October 1909 | Our Lady of Aparecida |
| 9 | Tuesday, 19 October 1909 | Piauí Day |
| 10 | Tuesday, 2 November 1909 | All Souls' Day |
| 11 | Monday, 15 November 1909 | Republic Proclamation Day |
| 12 | Wednesday, 8 December 1909 | Immaculate Conception |
| 13 | Saturday, 25 December 1909 | Christmas Day |