Jervis Bay Territory – Water Temperature Overview

Current Sea Water Temperature

It’s important to note that these swimming tips and recommendations apply only in settled weather. When air temperatures drop below 20°C — and sometimes even below 25°C — swimming can feel uncomfortable, even when water temperatures are relatively high.

Water Temperature and Swimming Conditions by Month

Jervis Bay Territory sits on the south coast of New South Wales and is known for clear waters and generally cooler sea temperatures compared with more northerly parts of Australia. Sea water temperatures typically range from about 15–17 °C in winter to around 20–23 °C in summer. During the warmer months, especially from January to March, the water becomes noticeably more comfortable for swimming, while still retaining a fresh, clean feel. Summer conditions usually provide the best balance between water temperature and calm seas.

Swimming Conditions

Swimming opportunities in the bay are shaped by both temperature and shelter. The enclosed nature of Jervis Bay allows sea temperatures to warm slightly more than the open coast, particularly on still, sunny days. Sheltered beaches often feel a degree or two warmer than exposed headlands, making them popular during the main swimming season. In winter and early spring, sea temperatures drop into the mid-teens, limiting swimming mostly to short dips or cold-water swimmers. Late summer and early autumn offer the most reliable conditions, with stable temperatures and calmer water.

Most Viewed Sea Places in the Jervis Bay Territory

Current Water Temperature in Lakes and Rivers

Inland water bodies within Jervis Bay Territory are limited but still play a role in local swimming conditions. Small creeks, lagoons, and freshwater pools respond quickly to seasonal air temperatures. In summer, inland water temperatures often sit between 18 and 24 °C, depending on depth, shade, and water flow. Shallow pools exposed to the sun can warm rapidly, creating comfortable conditions for swimming on hot days, while shaded or flowing water tends to remain cooler.

Seasonal changes have a noticeable effect on inland swimming. After rainfall, freshwater temperatures can drop temporarily and water clarity may reduce, affecting comfort and suitability for swimming. During extended dry periods, inland waters warm more consistently and become calmer. In autumn, temperatures begin to fall more quickly than the sea, often dropping below 18 °C by late season. Winter inland water temperatures are generally cool and less suitable for casual swimming. Overall, Jervis Bay Territory offers mild to cool swimming conditions, with the most comfortable water temperatures found in summer across both sea and inland environments.