September 3, 1990
- American Samoa
- Labour Day
- Bermuda
- Labour Day
- Canada
- Labour Day
- Spain
- Día de Ceuta
- Guam
- Labour Day
- Puerto Rico
- Labour Day
- San Marino
- The Feast of San Marino and the Republic
- Swaziland
- Umhlanga Reed Dance
- United States of America
- Labour Day
- U.S. Virgin Islands
- Labour Day
September 5, 1990
- Brazil
- Elevação do Amazonas à categoria de província
September 6, 1990
- Bulgaria
- Unification Day
- Caribbean Netherlands
- Bonaire Day
- Switzerland
- Jeûne Genevois
- São Tomé & Príncipe
- Armed Forces Day
- Swaziland
- Independence Day
September 7, 1990
- 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
- Senegal
- Magal de Touba
September 8, 1990
- Andorra
- Our Lady of Meritxell
- Brazil
- Nossa Senhora da Luz dos Pinhais
- 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 9, 1990
- Iran
- Arbaeen-e Hosseini
September 11, 1990
- Eritrea
- Geez New Year
- Spain
- Dia de Cataluña
- Ethiopia
- New Year's Day
- United States of America
- Primary Election Day
September 12, 1990
- Cape Verde
- National Day
September 13, 1990
- Brazil
- Criação do Território Federal
September 15, 1990
- 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, 1990
- Brazil
- Emancipação política
- Switzerland
- Federal Day of Thanksgiving, Repentance and Prayer
- St. Kitts & Nevis
- National Heroes' Day
- Libya
- Martyrs' Day
- Mexico
- Independence Day
- Malaysia
- Malaysia Day
- Papua New Guinea
- Independence Day
September 17, 1990
- Angola
- National Hero Day
- St. Kitts & Nevis
- National Heroes' Day (substitute day)
- Malaysia
- Malaysia Day (substitute day)
- Tonga
- Birthday of His Royal Highness The Crown Prince Tupotoʻa-ʻUlukalala
- Iran
- Demise of Prophet Muhammad and Imam Hassan (Mujtaba)
September 18, 1990
- Chile
- National holiday
- Spain
- Nuestra Señora de la Peña
- Canary Islands
- Nuestra Señora de la Peña
September 19, 1990
- Chile
- Army Day
- St. Kitts & Nevis
- Independence Day
- Iran
- Martyrdom of Imam Reza
September 22, 1990
- Bulgaria
- Independence Day
- Switzerland
- Mauritiustag
- Republic of Mali
- Independence Day
September 23, 1990
- Japan
- Autumnal Equinox Day
- Papua New Guinea
- September Equinox
September 24, 1990
- Austria
- Rupert
- Australia
- Queen's Birthday
- 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
- Japan
- Autumnal Equinox Day (substitute day)
- New Caledonia
- New Caledonia Day
- Trinidad & Tobago
- Republic Day
- South Africa
- Heritage Day
September 25, 1990
- Switzerland
- Saint Nicholas of Flüe
- Mozambique
- Defense Force’s Day
September 28, 1990
- Australia
- AFL Grand Final Friday
- Czech Republic
- St. Wenceslas Day (Czech Statehood Day)
- Turks & Caicos Islands
- National Youth Day
September 29, 1990
- Paraguay
- Boqueron Battle Victory Day
- Israel
- Day of Atonement (Yom Kippur)
- Montenegro
- Yom Kippur
September 30, 1990
- Botswana
- Botswana Day
- São Tomé & Príncipe
- Agricultural Reform Day
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