Campistrous is a commune in the Hautes-Pyrénées department in south-western France.

The Petite Baïse forms part of the commune's north-eastern border.

The average annual rainfall is 1,140.4 mm (44.90 in) with May as the wettest month.

The temperatures are highest on average in August, at around 19.3 °C (66.7 °F), and lowest in January, at around 5.3 °C (41.5 °F).

This Hautes-Pyrénées geographical article is a stub.