World Meteorological Day
23 March 2026 — Umbrella ready! Umbrella ready! Today the little cloud looks up at the sky and keeps an eye on the weather.
World Meteorological Day is observed every year on 23 March. It marks the entry into force of the Convention establishing the World Meteorological Organization (WMO) in 1950. The WMO later became a United Nations specialized agency for weather, climate and water. The day itself has been celebrated since 1961, and each year has a new theme about weather, climate or water. On this day, meteorological services around the world hold lectures, open days and exhibitions. People are reminded how much accurate forecasts matter: they help farmers, pilots, sailors and rescue teams, and they warn of storms, drought and floods. Meteorology is also closely tied to the sky. Clouds, wind and visibility decide when we can watch the stars, and observations of the atmosphere are the foundation of forecasts. So today it is worth looking up and asking what the sky is telling us.
Flying across the sky: An ethereal, bluish-silver star figure made of light dots and lines, like a constellation drifting across the sky: a fluffy little cloud with a tiny umbrella and a weather vane on top, leaving a faint trail of sparkling dots as it moves
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