Public holidays
1931, Portugal, Porto
| # | Date | Public holiday |
|---|---|---|
| 1 | Thursday, 1 January 1931 | Ano Novo |
| 2 | Friday, 3 April 1931 | Sexta-Feira Santa |
| 3 | Saturday, 25 April 1931 | Dia da Liberdade |
| 4 | Friday, 1 May 1931 | Dia do Trabalhador |
| 5 | Thursday, 4 June 1931 | Corpo de Deus |
| 6 | Wednesday, 10 June 1931 | Dia de Portugal |
| 7 | Wednesday, 24 June 1931 | Dia de São João |
| 8 | Saturday, 15 August 1931 | Assunção |
| 9 | Monday, 5 October 1931 | Implantação República |
| 10 | Sunday, 1 November 1931 | Todos os Santos |
| 11 | Tuesday, 1 December 1931 | Independência |
| 12 | Tuesday, 8 December 1931 | Imaculada Conceição |
| 13 | Friday, 25 December 1931 | Natal |