Saint-Firmin (French pronunciation: [sɛ̃ fiʁmɛ̃] ⓘ; Occitan: Sant Fermin) is a commune in the Hautes-Alpes department in southeastern France.

The average annual temperature in Saint-Firmin is 9.2 °C (48.6 °F).

The average annual rainfall is 1,097.0 mm (43.19 in) with October as the wettest month.

The temperatures are highest on average in July, at around 18.5 °C (65.3 °F), and lowest in January, at around 0.3 °C (32.5 °F).

This Hautes-Alpes geographical article is a stub.