The temperature

Venus,

In April in Hobart, the mean maximum temperature is 18.1 degree C, mean minimum 8.7 degree C; mean rainfall 42.7mm, mean number of days of rain 6.9. The best time to visit Tasmania is between October and April, when the weather is at its best.
The general climate of Tasmania below will help you plan what to wear.
Climate:
圖片參考：http://www.discovertasmania.com/__data/assets/image/0008/86984/tasmania_weather_in_autumn.jpg
Tasmania weather has four distinct seasons. The warmest months are December, January, February and March. Autumn (Fall) has many sunny days .The average summer temperatures sit between 17 and 23 degrees Celsius (62 and 73 degrees Fahrenheit) and in winter, between 3 and 11 degrees Celsius (37 and 51 degrees Fahrenheit). Tasmania’s location below the 40th parallel means the summer evenings display a lingering twilight.Tasmania has a maritime climate with four distinct seasons. Summer (December to March) is warm, Autumn (March to May) has sunny days and riotous colour, winter (June to August) is cold and spring (September to November) is fresh but often unpredictable. Rainfall varies dramatically across the Island. Hobart is Australia's second-driest capital city while the west coast attracts huge rainfall. Clothing:As Scottish comedian Billy Connolly said, 'There's no such thing as bad weather. There's only bad clothing'. Therefore, no matter what time of year you come, come prepared and bring a warm coat and a rain jacket. If you are coming in the cooler months, it's best to bring jumpers, long pants, as well as clothing you can layer, because even the winter sun can get quite warm, particularly in the east. Summer weather in Tasmania is usually warm, but even then, there can be sudden changes of temperature. When hiking, always take a jacket or jumper, a rain jacket, and a bottle of water, no matter the season, because sudden downpours, drops or climbs in temperature, do occur, particularly when at a higher altitude (Cradle Mountain etc).

You may visit the website of Bureau of Meteorology of Australia

http://www.bom.gov.au/

You can have clear information and forecast of weather there.