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

The average annual temperature in Montarnaud is 14.1 °C (57.4 °F).

The average annual rainfall is 869.9 mm (34.25 in) with October as the wettest month.

The temperatures are highest on average in July, at around 23.2 °C (73.8 °F), and lowest in January, at around 6.4 °C (43.5 °F).

This Hérault geographical article is a stub.