Tasmania – 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

Tasmania has the coolest sea water temperatures in Australia, shaped by its southern latitude and exposure to the Southern Ocean and the Tasman Sea. Along the coast, sea temperatures typically range from about 12–14 °C in winter to around 16–19 °C in summer. Even during the warmest months, the water remains cool, giving swimming a distinctly brisk feel. These conditions appeal mainly to experienced swimmers, with summer offering the most manageable temperatures for longer swims.

Swimming Conditions

Swimming opportunities around Tasmania’s coastline are closely linked to both temperature and local shelter. More protected bays and inlets can feel slightly warmer than open, exposed coasts, especially on calm, sunny days. Late summer and early autumn usually provide the most favourable conditions, when sea temperatures sit near their seasonal peak. In winter and early spring, water temperatures drop to the low teens, limiting swimming to cold-water enthusiasts. Short dips are more common than extended swims, and many people time their swims carefully around weather and swell conditions.

Most Viewed Sea Places in the Tasmania

Current Water Temperature in Lakes and Rivers

Inland Tasmania features a large number of lakes, rivers, and reservoirs, particularly in the Central Highlands, where water temperatures remain cool throughout the year. During summer, inland water temperatures commonly range from about 14–20 °C, depending on elevation, depth, and exposure to sunlight. Shallow lakes and slow-moving rivers at lower elevations can warm enough for comfortable swimming on hot days, while highland lakes often stay cold even in midsummer.

Seasonal changes strongly affect inland swimming conditions. In autumn, inland waters cool rapidly, with temperatures often falling below 15 °C by late season. Winter water temperatures are typically very cold, frequently dropping into single digits in higher areas, making swimming uncommon. Spring brings gradual warming, but many inland waters remain cool well into early summer. Overall, Tasmania offers a cold-water swimming environment, both along the coast and inland, with summer providing the narrow window when water temperatures are most suitable for recreational swimming.