The Jervis Bay experiences an oceanic climate (Köppen: Cfb) bordering on a humid subtropical climate (Köppen: Cfa) with warm and temperate conditions experienced, rarely experiencing extreme heat or frost.

Summers are usually warm and humid, with moderate precipitation primarily from cold fronts from the Tasman Sea.

Winters are cool and wet, and is moderated by the sea especially compared to inland lowland areas in New South Wales, as the cities of Wagga Wagga and Albury average 7.8 °C (46.0 °F) and 8.2 °C (46.8 °F) respectively, and going below freezing occurs in most years, and morning frost is normal in both cities.

Springs are comfortable cool and moderately dry, and the general southwesterly wind direction places Jervis Bay in a rain shadow during this season, reaching an average precipitation of just 61.5 mm (2.51 inches) in October.

Spring, like on the New South Wales coast, is the most variable season, as temperatures of 34.9 °C (94.8 °F) and 1.7 °C (35.1 °F) were recorded on 27 November 1997 and 19 September 2002 respectively.