September 1, 2018
- Eritrea
- Revolution Day
- Slovakia
- Constitution Day
- Uzbekistan
- Independence Day
September 2, 2018
- People's Republic of Bangladesh
- Krishna Janmashtami
- Spain
- DÃa de Ceuta
- Vietnam
- National Day
September 3, 2018
- American Samoa
- Labour Day
- Bermuda
- Labour Day
- Canada
- Labour Day
- Spain
- DÃa 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
- Uzbekistan
- Day off (substituted from 09/08/2018)
- Pakistan
- Janmashtami
September 4, 2018
- Uzbekistan
- Day off (substituted from 09/15/2018)
September 5, 2018
- Brazil
- Dia da Amazônia (AC)
- Elevação do Amazonas à categoria de provÃncia (AM)
September 6, 2018
- Bulgaria
- Unification Day
- Caribbean Netherlands
- Bonaire Day
- Switzerland
- Jeûne Genevois
- São Tomé & PrÃncipe
- Armed Forces Day
- Swaziland
- Independence Day
- Pakistan
- Defence Day
September 7, 2018
- 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, 2018
- 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
- Vatican City
- Nativity of Mary
September 11, 2018
- Eritrea
- Geez New Year
- Spain
- Dia de Cataluña
- Ethiopia
- New Year's Day
- United States of America
- Primary Election Day
- Jordan
- Islamic New Year (estimated)
- Kuwait
- Islamic New Year (estimated)
- United Arab Emirates
- Islamic New Year
- Bosnia and Herzegovina
- Islamic New Year
- Bahrain
- Islamic New Year
- Brunei
- Islamic New Year
- Cocos (Keeling) Islands
- Islamic New Year
- Djibouti
- Islamic New Year
- Algeria
- Islamic New Year
- Egypt
- Islamic New Year
- Western Sahara
- Islamic New Year
- Indonesia
- Islamic New Year
- Israel
- Rosh Hashanah (Day 2)
- Comoros
- Islamic New Year
- Libya
- Islamic New Year
- Kingdom of Morocco
- Islamic New Year
- Mauritania
- Islamic New Year
- Malaysia
- Islamic New Year
- Republic of the Niger
- Islamic New Year
- Nigeria
- Islamic New Year
- Sudan
- Islamic New Year
- Somalia
- Islamic New Year
- Tunisia
- Islamic New Year
September 12, 2018
- Cape Verde
- National Day
September 15, 2018
- 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, 2018
- Brazil
- Emancipação polÃtica
- 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, 2018
- Angola
- National Hero Day
- Chile
- National holiday
- Japan
- Respect-for-the-Aged 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
- Papua New Guinea
- Day off for Independence Day
September 18, 2018
- Chile
- National holiday
- Spain
- Nuestra Señora de la Peña
- Canary Islands
- Nuestra Señora de la Peña
September 19, 2018
- Chile
- Army Day
- St. Kitts & Nevis
- Independence Day
- Israel
- Day of Atonement (Yom Kippur)
- Iran
- Tasoua
- Montenegro
- Yom Kippur
September 20, 2018
- Brazil
- Proclamação da República Rio-Grandense
- People's Republic of Bangladesh
- Day of Ashura
- Bahrain
- Day of Ashura
- Algeria
- Day of Ashura
- The Gambia
- Day of Ashura
- Iran
- Ashoura
- Senegal
- Day of Ashura
September 22, 2018
- Bulgaria
- Independence Day
- Switzerland
- Mauritiustag
- Republic of Mali
- Independence Day
- Pakistan
- Ashura Holiday
September 23, 2018
- Japan
- Autumnal Equinox Day
- Saudi Arabia
- National Day Holiday
- Pakistan
- September Equinox
- Papua New Guinea
- September Equinox
September 24, 2018
- Austria
- Rupert
- Australia
- Queen's Birthday
- Bolivia
- Pando Day (N)
- Santa Cruz Day (S)
- China
- Mid-Autumn Festival
- 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)
- South Korea
- Korean Thanksgiving
- New Caledonia
- New Caledonia Day
- Trinidad & Tobago
- Republic Day
- Taiwan
- Mid-Autumn Festival
- South Africa
- Heritage Day
- Cambodia
- Constitution Day
- Israel
- Feast of Tabernacles (Sukkot)
September 25, 2018
- Switzerland
- Saint Nicholas of Flüe
- Hong Kong
- The day following the Chinese Mid-Autumn Festival
- Mozambique
- Defense Force’s Day
September 28, 2018
- Australia
- AFL Grand Final Friday
- Czech Republic
- St. Wenceslas Day (Czech Statehood Day)
- Turks & Caicos Islands
- National Youth Day
September 29, 2018
- Paraguay
- Boqueron Battle Victory Day
September 30, 2018
- Botswana
- Botswana Day
- São Tomé & PrÃncipe
- Agricultural Reform Day
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