Ceillac (French pronunciation: [sɛjak]; Occitan: Celhac) is a commune in the Hautes-Alpes department in southeastern France.

The average annual temperature in Ceillac is 6.2 °C (43.2 °F).

The average annual rainfall is 761.6 mm (29.98 in) with October as the wettest month.

The temperatures are highest on average in July, at around 15.4 °C (59.7 °F), and lowest in January, at around −1.5 °C (29.3 °F).

This Hautes-Alpes geographical article is a stub.