September 1, 2031
American Samoa- Labour Day
Bermuda- Labour Day
Canada- Labour Day
Eritrea- Revolution Day
Guam- Labour Day
Malaysia- Independence Day (substitute day)
Puerto Rico- Labour Day
Slovakia- Constitution Day
Swaziland- Umhlanga Reed Dance
Trinidad & Tobago- Independence Day (substitute day)
United States of America- Labour Day
U.S. Virgin Islands- Labour Day
Kazakhstan- Constitution Day (observed)
Uzbekistan- Independence Day
September 3, 2031
San Marino- The Feast of San Marino and the Republic
September 5, 2031
Brazil- Dia da Amazônia (AC)
- Elevação do Amazonas à categoria de provÃncia (AM)
São Tomé & PrÃncipe- Armed Forces Day (substitute day)
September 6, 2031
Bulgaria- Unification Day
Caribbean Netherlands- Bonaire Day
- São Tomé & PrÃncipe
- Armed Forces Day
- Swaziland
- Independence Day
September 7, 2031
- Brazil
- Independence Day
Spain- La Bajada de la Virgen del Socorro
Fiji- Constitution Day
Canary Islands- La Bajada de la Virgen del Socorro
Mozambique- Lusaka Peace Agreement
September 8, 2031
Andorra- Our Lady of Meritxell
- Brazil
- Nossa Senhora da Luz dos Pinhais (PR)
- Nossa Senhora da Natividade (TO)
- Spain
- DÃa de Asturias (AS)
- Nuestra Señora del Pino (CN)
- DÃa de Extremadura (EX)
- Canary Islands
- Nuestra Señora del Pino
Lichtenstein- Mariä Geburt
Macedonia- Independence Day
Malta- Victory Day
- Mozambique
- Public Holiday
- Swaziland
- Independence Day (substitute day)
Vatican City- Nativity of Mary
September 9, 2031
- United States of America
- Primary Election Day
September 11, 2031
Switzerland- Jeûne Genevois
- Eritrea
- Geez New Year
- Spain
- Dia de Cataluña
Ethiopia- New Year's Day
September 12, 2031
Cape Verde- National Day
September 13, 2031
- Brazil
- Criação do Território Federal
September 15, 2031
Bolivia- Cochabamba Day (substitutes)
Costa Rica- Independence Day
- Spain
- La Bien Aparecida (CB)
- Nuestra Señora de los Dolores (CN)
Guatemala- Independence Day
Honduras- Independence Day
- Canary Islands
- Nuestra Señora de los Dolores
Japan- Respect-for-the-Aged Day
Nicaragua- Independence Day
- Slovakia
- Day of Our Lady of the Seven Sorrows
El Salvador- Independence Day
September 16, 2031
- Brazil
- Emancipação polÃtica
St. Kitts & Nevis- National Heroes' Day
Libya- Martyrs' Day
Mexico- Independence Day
- Malaysia
- Malaysia Day
Papua New Guinea- Independence Day
September 18, 2031
Chile- National holiday
- Spain
- Nuestra Señora de la Peña
- Canary Islands
- Nuestra Señora de la Peña
Israel- Rosh Hashanah (Yom Teruah)
September 19, 2031
- Chile
- Army Day
- St. Kitts & Nevis
- Independence Day
- Israel
- Rosh Hashanah (Day 2)
September 21, 2031
Armenia- Independence Day
- Switzerland
- Federal Day of Thanksgiving, Repentance and Prayer
Ghana- Kwame Nkrumah Memorial Day
- Malta
- Independence Day
September 22, 2031
- Bulgaria
- Independence Day
Belize- Independence Day
- Switzerland
- Mauritiustag (AI)
- Ghana
- Kwame Nkrumah Memorial Day (substitute day)
Republic of Mali- Independence Day
September 23, 2031
- Japan
- Autumnal Equinox Day
Saudi Arabia- National Day Holiday
- Papua New Guinea
- September Equinox
September 24, 2031
Austria- Rupert
- Bolivia
- Pando Day (N)
- Santa Cruz Day (S)
Dominican Republic- Our Lady of las Mercedes
- Spain
- Nuestra Señora de los Reyes (CN)
- Mare de Déu de la Mercè (CT)
Guinea-Bissau- Independence Day
- Canary Islands
- Nuestra Señora de los Reyes
New Caledonia- New Caledonia Day
- Trinidad & Tobago
- Republic Day
South Africa- Heritage Day
Cambodia- Constitution Day
September 25, 2031
- Switzerland
- Saint Nicholas of Flüe
- Mozambique
- Defense Force’s Day
September 26, 2031
Australia- AFL Grand Final Friday
Turks & Caicos Islands- National Youth Day
September 27, 2031
- Eritrea
- Meskel
- Ethiopia
- Finding of the True Cross
- Israel
- Day of Atonement (Yom Kippur)
Montenegro- Yom Kippur
September 28, 2031
Czech Republic- St. Wenceslas Day (Czech Statehood Day)
September 30, 2031
Botswana- Botswana Day
- Canada
- National Day for Truth and Reconciliation
- São Tomé & PrÃncipe
- Agricultural Reform Day
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