Tasmania's warm spell looks set to break records.

If the warm weather holds till Saturday, Hobart will have experienced 100 consecutive days with maximum temperatures of at least 17.

The weather bureau says it is easily the longest run of such mild weather in Hobart since records began in 1895.

The mild spell started on December 18, with 38.3 degrees on New Year's Eve the highest maximum.

Hobart's coldest day was on February 27, when it was 17.4 degrees.

In Launceston the temperature has reached 17 degrees every day since October 19.