Saint-Ségal (French pronunciation: [sɛ̃ seɡal]; Breton: Sant-Segal) is a commune in the Finistère department of Brittany in north-western France.

The average annual rainfall is 1,122.9 mm (44.21 in) with January as the wettest month.

The temperatures are highest on average in August, at around 17.5 °C (63.5 °F), and lowest in January, at around 6.6 °C (43.9 °F).

Inhabitants of Saint-Ségal are called in French Saint-Ségalais.

This Finistère geographical article is a stub.