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The United Nations' (UN) World Meteorological Day is annually held on or around March 23 to remember the World Meteorological Organization's establishment on that date in 1950.

Many different activities and events are organized for this occasion.

World Meteorological Day often features various events such as conferences, symposia and exhibitions for meteorological professionals, community leaders and the general public. Some events aim to attract media attention to raise meteorology's profile.

The International Meteorological Organization was established at the first International Meteorological Congress in Vienna, Austria, in 1873. The organization aimed to establish meteorological station networks. These networks were linked by telegraph and improved weather forecasts. This contributed to shipping services' safety and efficiency.

The International Meteorological Organization became the World Meteorological Organization on March 23, 1950. It became the UN's specialized agency for meteorology, operational hydrology and related geophysical sciences in 1951.

World Meteorological Day has been observed on March 23 each year since 1961.