Day Guide for Monday September 15th 2025 What are the holidays on September 15th 2025?

This is our day guide for Monday September 15th 2025 which shows you at a glance what's happening on this day around the world. Using the calendar on this page, you can look at a day guide for any day. Why not look up your birthday to see which holidays you share it with?

Holidays on September 15th 2025

Regional

Bolivia (regional): Cochabamba Day (in lieu)

The Day of the Cochabamba Department takes place on September 14th marking the second foundation of the city on that day in 1574.

Costa Rica: Independence Day

Local celebrations, national pride and a spirit of community mark Costa Rica’s Independence Day. One of the year’s most important holidays, Costa Rica celebrates its freedom from colonial Spain with peaceful festivities and historic traditions.

El Salvador: Independence Day

Celebrates independence from Spain, achieved in 1821

Guatemala: Independence Day

Commemorates independence of the Central American provinces from Spanish rule in 1821

Honduras: Independence Day

Commemorates the independence of the Central American provinces from Spanish rule in 1821

Japan: Respect for the Aged Day

Respect of the Aged Day was established as a national holiday in 1966 to express respect for the elders in the community

Malaysia: Malaysia Day Holiday

An additional public holiday in conjunction with the 2025 Malaysia Day celebration.

Nicaragua: Independence Day

Commemorates independence of the Central American provinces from Spanish rule in 1821

Papua New Guinea: Independence Day Holiday

Commemorates the day Papua New Guinea gained its indepence from Australia in 1975

Slovakia: Day of Our Lady of Sorrows

In 1727, Pope Benedict XIII declared Our Lady of Sorrows to be respected by the Church and its members as a Patron of Slovakia and later in 1966 was declared by Pope Paul VI as the main Patron.

Regional

Spain (regional): Lady of Aparecida

Honours the Virgin Mary, Cantabria's patron saint through a statue that was found at the start of the 17th century.

Regional

Switzerland (regional): Knabenschiessen

Zurich only. Knabenschiessen is a traditional shooting competition for teenagers

Not a Public Holiday

Zimbabwe: Munhumutapa Day

Honours the pre-colonial ruler Munhumutapa and President Mnangagwa's vision of national development.

Observances on September 15th 2025

New Zealand: Māori Language Week

Find out the dates, history and traditions of Māori Language Week.

USA: Google.com Day

Maybe Google should do a do0dle for their birthday?

USA: Greenpeace Day

Find out the dates, history and traditions of Greenpeace Day

United Nations: International Day of Democracy 

The International Day of Democracy provides an opportunity to review the state of democracy in the world.

USA: International Dot Day

A day to consider the mark that you make upon the world.

USA: National Creme de Menthe Day

Find out the dates, history and traditions of National Creme de Menthe Day

USA: National Double Cheeseburger Day

Find out the dates, history and traditions of National Double Cheeseburger Day

USA: National Felt Hat Day

Find out the dates, history and traditions of National Felt Hat Day

USA: National Linguine Day

Find out the dates, history and traditions of National Linguine Day

Slovenia: Return of Primorska to the Motherland

Primorsko Reunification Day has been a national holiday since 2006, but it is not a work-free day.

Serbia: Serbian Unity, Freedom and National Flag Day

The Salonica front, was a military theatre of the first world war formed as a result of an attempt by the Allied Powers to aid Serbia, in 1915, against the combined attack of Germany, Austria-Hungary and Bulgaria.

International: World Afro Day

A day where people are encouraged to celebrate kinky, coiled or curly afro textured hair and to learn more about it.

USA: Hispanic Heritage Month

The monthlong period is a time to learn about the people who have influenced America in such a great way and learn about the culture that has significantly influenced American culture.

USA: National Online Learning Day

National Online Learning Day showcases how students of all ages are thriving with the ability to learn online—anywhere, anytime.

September 14th 2025 | Go to Today | September 16th 2025

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General Information for September 15th 2025
There are 13 public holidays today.
Day 258 of 2025
107 days left in 2025
Week 38 of the year
On this Day in History
1978 - Muhammad Ali outpointed Leon Spinks in a rematch to become the first boxer to win the world heavyweight title 3 times at the Superdome in New Orleans.
1940 - World War II: The climax of the Battle of Britain, when the Royal Air Force shoots down large numbers of Luftwaffe aircraft.
1894 - First Sino-Japanese War: Japan defeats China in the Battle of Pyongyang.
1820 - Constitutionalist revolution in Lisbon, Portugal.