There is a total of 231 public holidays and observances in September of 2021 for over 230 countries and 3300 locations around the world. In the table below, you will find the details of the holidays & observances along with when and where they are observed.

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Date Holiday Location
Wednesday, September 1, 2021 Constitution Day
Slovakia
Wednesday, September 1, 2021 Knowledge and Literature Day
Armenia
Wednesday, September 1, 2021 Kirani Day
Grenada
Wednesday, September 1, 2021 World Peace Day
Germany
Wednesday, September 1, 2021 Commencement Day of Eritrean Armed Struggle
Eritrea
Wednesday, September 1, 2021 Day of Knowledge
Russia
Wednesday, September 1, 2021 Independence Day
Uzbekistan
Thursday, September 2, 2021 Army Day
Nicaragua
Thursday, September 2, 2021 Day of the Independent City of Ceuta
Spain
Friday, September 3, 2021 The Feast of St Marinus and Republic Day
San Marino
Friday, September 3, 2021 Labor Day
Marshall Islands
Friday, September 3, 2021 Yamashita Surrender Day
Philippines
Friday, September 3, 2021 Armed Forces Day
Taiwan
Saturday, September 4, 2021 World Sexual Health Day
United States
Sunday, September 5, 2021 Father's Day
Australia
Sunday, September 5, 2021 International Day of Charity
United States
Sunday, September 5, 2021 Mother Teresa Beatification Day
Albania
Monday, September 6, 2021 Armed Forces' Day
Sao Tome and Principe
Monday, September 6, 2021 Somhlolo Day (Independence Day)
Eswatini
Monday, September 6, 2021 Rosh Hashana Eve
Israel
Monday, September 6, 2021 Umhlanga Reed Dance
Eswatini
Monday, September 6, 2021 Labour Day
Canada
Monday, September 6, 2021 Labor Day
US Virgin Islands
Monday, September 6, 2021 Rosh Hashana Eve
Argentina
Monday, September 6, 2021 Defence Day
Pakistan
Monday, September 6, 2021 Day off for Mother Teresa Beatification Day
Albania
Monday, September 6, 2021 Labor Day
Northern Mariana Islands
Monday, September 6, 2021 Unification Day
Bulgaria
Monday, September 6, 2021 Labor Day
Guam
Tuesday, September 7, 2021 Constitution Day
Fiji
Tuesday, September 7, 2021 Victory Day
Mozambique
Tuesday, September 7, 2021 Rosh Hashana
Canada
Tuesday, September 7, 2021 Faro Day
Portugal
Tuesday, September 7, 2021 Rosh Hashana
United States
Tuesday, September 7, 2021 Independence Day
Brazil
Tuesday, September 7, 2021 Rosh Hashana
United Kingdom
Wednesday, September 8, 2021 International Literacy Day
United States
Wednesday, September 8, 2021 National Day
Andorra
Wednesday, September 8, 2021 Virgin of the Plains
Spain
Wednesday, September 8, 2021 Day of Asturias
Spain
Wednesday, September 8, 2021 Day of Extremadura
Spain
Wednesday, September 8, 2021 Virgin of the Victory
Spain
Wednesday, September 8, 2021 Nativity of Mary
Lebanon
Wednesday, September 8, 2021 Nativity of Our Lady
Liechtenstein
Wednesday, September 8, 2021 Feast of the Nativity of Mary
Philippines
Wednesday, September 8, 2021 Independence Day
North Macedonia
Wednesday, September 8, 2021 The Feast of Our Lady of Victories
Malta
Wednesday, September 8, 2021 Rosh Hashana (Day 2)
Israel
Wednesday, September 8, 2021 Kosrae Liberation Day
Micronesia
Wednesday, September 8, 2021 Second day of Rosh Hashana
Argentina
Thursday, September 9, 2021 Children's Day
Costa Rica
Thursday, September 9, 2021 California Admission Day
United States
Thursday, September 9, 2021 Gedaliah Fast
Israel
Thursday, September 9, 2021 Day of the Victims of Holocaust and of racial violence
Slovakia
Thursday, September 9, 2021 Jeune Genevois
Switzerland
Thursday, September 9, 2021 National Day
North Korea
Thursday, September 9, 2021 Independence Day
Tajikistan
Thursday, September 9, 2021 Martyrs and Ahmad Shah Masoud Day
Afghanistan
Friday, September 10, 2021 Repression Victims' Day
Mongolia
Friday, September 10, 2021 World Suicide Prevention Day
United States
Friday, September 10, 2021 Ganesh Chaturthi
Pakistan
Friday, September 10, 2021 Teachers' Day
China
Friday, September 10, 2021 Ganesh Chaturthi
Bangladesh
Friday, September 10, 2021 St. George's Caye Day
Belize
Friday, September 10, 2021 Children's Day
Honduras
Friday, September 10, 2021 Pohnpei Liberation Day observed
Micronesia
Friday, September 10, 2021 Ganesh Chaturthi
Indonesia
Friday, September 10, 2021 Ganesh Chaturthi/Vinayaka Chaturthi
India
Friday, September 10, 2021 Gibraltar Day
Gibraltar
Saturday, September 11, 2021 Our Lady of Coromoto
Venezuela
Saturday, September 11, 2021 German Language Day
Germany
Saturday, September 11, 2021 Knabenschiessen
Switzerland
Saturday, September 11, 2021 Day of Catalonia
Spain
Saturday, September 11, 2021 Pohnpei Liberation Day
Micronesia
Saturday, September 11, 2021 Nayrouz
Egypt
Saturday, September 11, 2021 Patriot Day
United States
Saturday, September 11, 2021 Ganesh Chaturthi
Mauritius
Saturday, September 11, 2021 Carl Garner Federal Lands Cleanup Day
United States
Saturday, September 11, 2021 Day of the Workers in the Energy Sector
Turkmenistan
Saturday, September 11, 2021 Thimphu Drubchoe (Thimphu only)
Bhutan
Sunday, September 12, 2021 European Heritage Days
Germany
Sunday, September 12, 2021 Fathers' Day
North Macedonia
Sunday, September 12, 2021 International Day for South-South Cooperation
United States
Sunday, September 12, 2021 National Grandparents Day
United States
Sunday, September 12, 2021 Knabenschiessen
Switzerland
Monday, September 13, 2021 Almarhum Sultan Iskandar Hol Day
Malaysia
Monday, September 13, 2021 Election day
Norway
Monday, September 13, 2021 Independence Day
Costa Rica
Monday, September 13, 2021 International Programmers' Day
United States
Tuesday, September 14, 2021 Battle of San Jacinto
Nicaragua
Wednesday, September 15, 2021 Shout of Dolores
Mexico
Wednesday, September 15, 2021 Birth of Bocage
Portugal
Wednesday, September 15, 2021 Day of Our Lady of Sorrows
Slovakia
Wednesday, September 15, 2021 Restoration of Primorska to the Motherland Day
Slovenia
Wednesday, September 15, 2021 International Day of Democracy
United States
Wednesday, September 15, 2021 Yom Kippur Eve
Israel
Wednesday, September 15, 2021 Nuestra Señora de la Bien Aparecida
Spain
Wednesday, September 15, 2021 Independence Day
Guatemala
Wednesday, September 15, 2021 Thimphu Tshechu (Thimphu only)
Bhutan
Wednesday, September 15, 2021 Independence Day
Honduras
Wednesday, September 15, 2021 Yom Kippur Holiday
Montenegro
Wednesday, September 15, 2021 Independence Day
Nicaragua
Thursday, September 16, 2021 Martyrs' Day
Libya
Thursday, September 16, 2021 Independence Day
Mexico
Thursday, September 16, 2021 Malaysia Day
Malaysia
Thursday, September 16, 2021 National Heroes Day
Saint Kitts and Nevis
Thursday, September 16, 2021 Yom Kippur
Argentina
Thursday, September 16, 2021 Thimphu Tshechu (Thimphu only)
Bhutan
Thursday, September 16, 2021 First day of Yom Kippur (Jewish community)
North Macedonia
Thursday, September 16, 2021 Yom Kippur
Austria
Thursday, September 16, 2021 Independence Day
Papua New Guinea
Thursday, September 16, 2021 Yom Kippur
Israel
Thursday, September 16, 2021 International Day for the Preservation of the Ozone Layer
United States
Friday, September 17, 2021 Teacher's Day
Honduras
Friday, September 17, 2021 Thimphu Tshechu (Thimphu only)
Bhutan
Friday, September 17, 2021 Birthday of Crown Prince Tupouto'a-'Ulukalala
Tonga
Friday, September 17, 2021 Day of Melilla
Spain
Friday, September 17, 2021 National Hero Day
Angola
Friday, September 17, 2021 Still's Disease Awareness Day
United States
Friday, September 17, 2021 Constitution Day and Citizenship Day
United States
Friday, September 17, 2021 National POW/MIA Recognition Day
United States
Saturday, September 18, 2021 National CleanUp Day
United States
Saturday, September 18, 2021 Valentine's Day
Colombia
Saturday, September 18, 2021 National Day
Chile
Saturday, September 18, 2021 Air Force Birthday
United States
Sunday, September 19, 2021 Constitution Day
Nepal
Sunday, September 19, 2021 Swiss Federal Fast
Switzerland
Sunday, September 19, 2021 Foundation of the Slovak National Council Day
Slovakia
Sunday, September 19, 2021 The Feast of Saint Januarius (Naples)
Italy
Sunday, September 19, 2021 Army Day
Chile
Sunday, September 19, 2021 Independence Day
Saint Kitts and Nevis
Sunday, September 19, 2021 Day of the Walloon Region
Belgium
Monday, September 20, 2021 Federal Fast Monday
Switzerland
Monday, September 20, 2021 Chuseok Holiday
South Korea
Monday, September 20, 2021 German World Children's Day
Germany
Monday, September 20, 2021 Sukkot Eve
Israel
Monday, September 20, 2021 Respect for the Aged Day
Japan
Monday, September 20, 2021 Binara Full Moon Poya Day
Sri Lanka
Tuesday, September 21, 2021 Mid-Autumn Festival
China
Tuesday, September 21, 2021 St. Matthew's Day
Portugal
Tuesday, September 21, 2021 Mid-Autumn Festival
Hong Kong
Tuesday, September 21, 2021 Chuseok
South Korea
Tuesday, September 21, 2021 First day of Sukkot
Australia
Tuesday, September 21, 2021 Independence Day
Armenia
Tuesday, September 21, 2021 First Day of Sukkot
United States
Tuesday, September 21, 2021 Mid-Autumn Festival
Taiwan
Tuesday, September 21, 2021 Independence Day
Belize
Tuesday, September 21, 2021 Sukkot (Day 1)
Israel
Tuesday, September 21, 2021 Kwame Nkrumah Memorial Day
Ghana
Tuesday, September 21, 2021 International Day of Peace
United States
Tuesday, September 21, 2021 First day of Sukkot
United Kingdom
Wednesday, September 22, 2021 Chuseok Holiday
South Korea
Wednesday, September 22, 2021 Sukkot (Day 2)
Israel
Wednesday, September 22, 2021 Day after the Mid-Autumn-Festival
Macau
Wednesday, September 22, 2021 Independence Day
Mali
Wednesday, September 22, 2021 Day after Mid-Autumn Festival
Hong Kong
Wednesday, September 22, 2021 Emancipation Day
United States
Wednesday, September 22, 2021 Mauritius Day
Switzerland
Wednesday, September 22, 2021 Independence Day
Bulgaria
Wednesday, September 22, 2021 September Equinox
American Samoa
Thursday, September 23, 2021 World Maritime Day
United States
Thursday, September 23, 2021 Sukkot (Day 3)
Israel
Thursday, September 23, 2021 Blessed Rainy Day
Bhutan
Thursday, September 23, 2021 Saudi National Day
Saudi Arabia
Thursday, September 23, 2021 International Celebrate Bisexuality Day
United States
Thursday, September 23, 2021 Day of Saint Tecla
Spain
Thursday, September 23, 2021 Slovenian Sports Day
Slovenia
Wednesday, September 22, 2021 September Equinox
Tajikistan
Thursday, September 23, 2021 Autumn Equinox
Japan
Friday, September 24, 2021 Saint Rupert's Day
Austria
Friday, September 24, 2021 Friday before the AFL Grand Final
Australia
Friday, September 24, 2021 Michigan Indian Day
United States
Friday, September 24, 2021 New Caledonia Day
New Caledonia
Friday, September 24, 2021 Native American Day
United States
Friday, September 24, 2021 Heritage Day
South Africa
Friday, September 24, 2021 Native American Day
United States
Friday, September 24, 2021 American Indian Heritage Day
United States
Friday, September 24, 2021 Constitutional Day
Cambodia
Friday, September 24, 2021 Our Lady of Las Mercedes
Dominican Republic
Friday, September 24, 2021 Manit Day
Marshall Islands
Friday, September 24, 2021 Sukkot (Day 4)
Israel
Friday, September 24, 2021 Republic Day
Trinidad and Tobago
Friday, September 24, 2021 Independence Day (National Day)
Guinea-Bissau
Friday, September 24, 2021 National Youth Day
Turks and Caicos Islands
Friday, September 24, 2021 Armed Forces Day
Peru
Friday, September 24, 2021 Anniversary of the Failed Attack on Lomé
Togo
Saturday, September 25, 2021 Sukkot (Day 5)
Israel
Saturday, September 25, 2021 St. Nicholas of Flüe
Switzerland
Saturday, September 25, 2021 Armed Forces Day
Mozambique
Sunday, September 26, 2021 Sukkot (Day 6)
Israel
Sunday, September 26, 2021 Gold Star Mother's Day
United States
Sunday, September 26, 2021 International Day for the Total Elimination of Nuclear Weapons
United States
Sunday, September 26, 2021 European Heritage Days
Austria
Sunday, September 26, 2021 Grand Magal de Touba
Senegal
Sunday, September 26, 2021 Revolution Day
Yemen
Saturday, September 25, 2021 Daylight Saving Time starts
Samoa
Monday, September 27, 2021 American Indian Day
United States
Monday, September 27, 2021 Hoshana Rabbah
Australia
Monday, September 27, 2021 Queen's Birthday
Australia
Monday, September 27, 2021 Sukkot (Day 7) / Hoshanah Rabah
Israel
Monday, September 27, 2021 Independence Day
Turkmenistan
Monday, September 27, 2021 Hoshana Rabbah
United Kingdom
Monday, September 27, 2021 World Tourism Day
United States
Monday, September 27, 2021 Hoshana Rabbah
Canada
Monday, September 27, 2021 Corn Riots Anniversary Bank Holiday
Jersey
Monday, September 27, 2021 Last Day of Sukkot
United States
Monday, September 27, 2021 World Tourism Day
Congo Democratic Republic
Monday, September 27, 2021 Meskel
Ethiopia
Monday, September 27, 2021 Day of the French Community
Belgium
Monday, September 27, 2021 Meskel
Eritrea
Monday, September 27, 2021 South Canterbury Anniversary Day
New Zealand
Tuesday, September 28, 2021 Chelum
Pakistan
Tuesday, September 28, 2021 Shemini Atzeret
Canada
Tuesday, September 28, 2021 St. Wenceslas Day
Czechia
Tuesday, September 28, 2021 Day of Bosnians
Kosovo
Tuesday, September 28, 2021 Arbaeen
Iran
Tuesday, September 28, 2021 Shmini Atzeret
United States
Tuesday, September 28, 2021 Teachers' Day
Taiwan
Tuesday, September 28, 2021 Shemini Atzeret
Australia
Tuesday, September 28, 2021 Shemini Atzeret / Simchat Torah
Israel
Tuesday, September 28, 2021 International Bosniaks' Day (for Bosniak community)
North Macedonia
Tuesday, September 28, 2021 World Rabies Day
United States
Tuesday, September 28, 2021 Shemini Atzeret
United Kingdom
Wednesday, September 29, 2021 Boqueron Battle Victory Day
Paraguay
Wednesday, September 29, 2021 Simchat Torah
United States
Wednesday, September 29, 2021 World Heart Day
United States
Wednesday, September 29, 2021 Simchat Torah
United Kingdom
Wednesday, September 29, 2021 Jitiya
Nepal
Wednesday, September 29, 2021 Simchat Torah
Canada
Thursday, September 30, 2021 Nationalization of the Roças
Sao Tome and Principe
Thursday, September 30, 2021 Botswana Day
Botswana