A total fire ban has been declared for Southern Tasmania this weekend with temperatures in the high 30s forecast to break 11 year record.

According to Tasmania Fire Service chief officer Chris Arnol, the conditions forecast for Friday and Saturday are equal to the worst they have seen this bushfire season.

Dry, hot and gusty conditions, with the potential of thunderstorms, increases the fire risk.

Mr Arnol is urging people to not use fire, even in the regions that are not covered by the total fire ban.