Popian (French pronunciation: [pɔpjɑ̃]) is a commune in the Hérault department in the Occitanie region in southern France.

The neighboring communes are Gignac, Saint-Bauzille-de-la-Sylve, Le Pouget and Pouzols.

In 2010, the climate of the commune is classified as a frank Mediterranean climate, according to a study based on a dataset covering the 1971-2000 period. In 2020, Météo-France published a typology of climates in mainland France in which the commune is exposed to a Mediterranean climate and is part of the Provence, Languedoc-Roussillon climatic region, characterized by low rainfall in summer, very good sunshine (2,600 h/year), a hot summer 21.5 °C (71 °F), very dry air in summer, dry conditions in all seasons, strong winds (with a frequency of 40 to 50% for winds > 5 m/s), and little fog.

For the 1971-2000 period, the average annual temperature was 14.4 °C (58 °F) with an annual atmospheric temperature of 16.5 °C (62 °F). The average annual total rainfall during this period was 774 mm, with 6.4 days of precipitation in January and 2.7 days in July. For the subsequent period of 1991 to 2020, the average annual temperature observed at the nearest weather station, located in the commune of Saint-André-de-Sangonis, 4 kilometres (2 mi) away as the crow flies, is 15.5 °C (60 °F), and the average annual total rainfall is 652.4 mm.

For the future, climate parameters for the commune projected for 2050, based on different greenhouse gas emission scenarios, can be consulted on a dedicated website published by Météo-France in November 2022.

In 2022, the commune had a population of 368.

Historical population

Year Pop. ±% p.a. 1793 183 —     1800 153 −2.53% 1806 198 +4.39% 1821 199 +0.03% 1831 174 −1.33% 1836 180 +0.68% 1841 168 −1.37% 1846 154 −1.73% 1851 170 +2.00% 1856 153 −2.09% 1861 128 −3.51% 1866 149 +3.08% 1872 159 +1.09% 1876 157 −0.32% 1881 123 −4.76% 1886 118 −0.83% 1891 141 +3.63% 1896 140 −0.14% 1901 171 +4.08%	Year Pop. ±% p.a. 1906 182 +1.25% 1911 156 −3.04% 1921 187 +1.83% 1926 225 +3.77% 1931 251 +2.21% 1936 239 −0.98% 1946 169 −3.41% 1954 217 +3.17% 1962 233 +0.89% 1968 214 −1.41% 1975 198 −1.10% 1982 168 −2.32% 1990 195 +1.88% 1999 248 +2.71% 2007 332 +3.71% 2012 351 +1.12% 2017 350 −0.06% 2022 368 +1.01%
Source: Ldh/EHESS/Cassini until 1999, and INSEE since 2007.

• Communes of the Hérault department