The heat is on, and some New Jersey school districts are going to have a half day or early dismissal.

They include Union Public Schools, which also will cancel all after-school activities, sports and events.

There are a handful of districts across the state with early dismissals or half days, including:

Some are even making the adjustment for tomorrow as the heat continues.

School districts will be monitoring the conditions as there is a heat advisory and air quality alert in parts of the state.