Sainte-Gemme-la-Plaine (French pronunciation: [sɛ̃t ʒɛm la plɛn]) is a commune in the Vendée department in the Pays de la Loire region in western France.

The average annual temperature in Sainte-Gemme-la-Plaine is 13.0 °C (55.4 °F).

The average annual rainfall is 809.1 mm (31.85 in) with October as the wettest month.

The temperatures are highest on average in August, at around 20.1 °C (68.2 °F), and lowest in January, at around 6.4 °C (43.5 °F).

This Vendée geographical article is a stub.