Plœuc-l'Hermitage has an oceanic climate (Köppen climate classificationCfb). The average annual temperature in Plœuc-l'Hermitage is 10.8 °C (51.4 °F). The average annual rainfall is 929.8 mm (36.61 in) with December as the wettest month. The temperatures are highest on average in August, at around 17.3 °C (63.1 °F), and lowest in January, at around 5.0 °C (41.0 °F). The highest temperature ever recorded in Plœuc-l'Hermitage was 38.5 °C (101.3 °F) on 9 August 2003; the coldest temperature ever recorded was −13.0 °C (8.6 °F) on 2 January 1997.
Climate data for Plœuc-sur-Lié, Plœuc-l'Hermitage[4] (1981–2010 averages, extremes 1986−2020)