September 1, 2028
- Eritrea
- Revolution Day
- Slovakia
- Constitution Day
- Uzbekistan
- Independence Day
September 3, 2028
- San Marino
- The Feast of San Marino and the Republic
September 4, 2028
- American Samoa
- Labour Day
- Bermuda
- Labour Day
- Canada
- Labour Day
- Gibraltar
- Gibraltar National Day (substitute day)
- Guam
- Labour Day
- Puerto Rico
- Labour Day
- Swaziland
- Umhlanga Reed Dance
- United States of America
- Labour Day
- U.S. Virgin Islands
- Labour Day
September 5, 2028
- Brazil
- Dia da Amazônia (AC)
- Elevação do Amazonas à categoria de província (AM)
September 6, 2028
- Bulgaria
- Unification Day
- Caribbean Netherlands
- Bonaire Day
- São Tomé & Príncipe
- Armed Forces Day
- Swaziland
- Independence Day
September 7, 2028
- Brazil
- Independence Day
- Switzerland
- Jeûne Genevois
- 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, 2028
- Andorra
- Our Lady of Meritxell
- Brazil
- Nossa Senhora da Luz dos Pinhais (PR)
- Nossa Senhora da Natividade (TO)
- Spain
- Día de Asturias (AS)
- Nuestra Señora del Pino (CN)
- Día de Extremadura (EX)
- Canary Islands
- Nuestra Señora del Pino
- Lichtenstein
- Mariä Geburt
- Macedonia
- Independence Day
- Malta
- Victory Day
- Vatican City
- Nativity of Mary
September 12, 2028
- Cape Verde
- National Day
- Eritrea
- Geez New Year
- Ethiopia
- New Year's Day
- United States of America
- Primary Election Day
September 13, 2028
- Brazil
- Criação do Território Federal
September 15, 2028
- 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
- Nicaragua
- Independence Day
- Slovakia
- Day of Our Lady of the Seven Sorrows
- El Salvador
- Independence Day
September 16, 2028
- Brazil
- Emancipação política
- St. Kitts & Nevis
- National Heroes' Day
- Libya
- Martyrs' Day
- Mexico
- Independence Day
- Malaysia
- Malaysia Day
- Papua New Guinea
- Independence Day
September 17, 2028
- Angola
- National Hero Day
- Switzerland
- Federal Day of Thanksgiving, Repentance and Prayer
- Cambodia
- Pchum Ben Day
September 19, 2028
- Chile
- Army Day
- St. Kitts & Nevis
- Independence Day
- Cambodia
- Pchum Ben Day
September 22, 2028
- Bulgaria
- Independence Day
- Switzerland
- Mauritiustag
- Japan
- Autumnal Equinox Day
- Republic of Mali
- Independence Day
- Israel
- Rosh Hashanah (Day 2)
- Papua New Guinea
- September Equinox
September 23, 2028
- Saudi Arabia
- National Day Holiday
September 24, 2028
- Austria
- Rupert
- Bolivia
- Pando Day (N)
- Santa Cruz Day (S)
- Dominican Republic
- Our Lady of las Mercedes
- Spain
- Nuestra Señora de los Reyes
- 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
- Saudi Arabia
- National Day Holiday (observed)
September 25, 2028
- Australia
- King's Birthday
- Bolivia
- Pando Day (substitutes) (N)
- Santa Cruz Day (substitutes) (S)
- Switzerland
- Saint Nicholas of Flüe
- Spain
- Mare de Déu de la Mercè
- Mozambique
- Defense Force’s Day
- Trinidad & Tobago
- Republic Day (substitute day)
- South Africa
- Public Holiday
September 28, 2028
- Czech Republic
- St. Wenceslas Day (Czech Statehood Day)
- Eritrea
- Meskel
- Ethiopia
- Finding of the True Cross
September 29, 2028
- Australia
- AFL Grand Final Friday
- Paraguay
- Boqueron Battle Victory Day
- São Tomé & Príncipe
- Agricultural Reform Day (substitute day)
- Turks & Caicos Islands
- National Youth Day
September 30, 2028
- Botswana
- Botswana Day
- Canada
- National Day for Truth and Reconciliation
- São Tomé & Príncipe
- Agricultural Reform Day
- Israel
- Day of Atonement (Yom Kippur)
- Montenegro
- Yom Kippur
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