The sweltering heat wave that’s settled on the Big Apple continues today, with the mercury expected to hit 97 or higher by midday — along with a blistering heat index approaching 110 degrees.

An excessive heat warning is in effect until 9 p.m. Sunday, and Mayor Bill de Blasio implored residents on Sunday morning to stay indoors amid the oppressive conditions outdoors.

The hot-as-hell Sunday comes on the heels of record Saturday temperatures that sent city dwellers scrambling for pools and beaches to try and beat the heat.

The mercury on Saturday reached 96 degrees at Kennedy Airport — on par with a historic high set in 2011 — but the heat index was 110 and New Yorkers can expect much of the same today.