  We use daily longitudinal data and a within-worker identification approach to
examine the impacts of heat on labor force dynamics in Australia. High
temperatures during 2001-2019 significantly reduced work attendance and hours
worked, which were not compensated for in subsequent days and weeks. The
largest reductions occurred in cooler regions and recent years, and were not
solely concentrated amongst outdoor-based workers. Financial and Insurance
Services was the most strongly affected industry, with temperatures above
38{\deg}C (100{\deg}F) increasing absenteeism by 15 percent. Adverse heat
effects during the work commute and during outdoor work hours are shown to be
key mechanisms.
