The National Weather Service posted a high-heat advisory Monday and forecast temperatures just below 100 degrees in the Triangle and above 100 to the south.
The advisory covered all of central North Carolina for Monday, and Tuesday’s forecasts called for triple-digit readings in Raleigh and Durham.
“The combination of hot temperatures and high humidity today will push heat index values up to dangerous readings,” the weather service said.
The record high temperature at Raleigh-Durham International Airport for Monday’s date was 97 degrees, set in 1981.
Tuesday’s record was a degree higher, 99 in 1945.
The heat index, calculated using temperature and relative humidity, was expected to be from 100 to 106 on Monday.
Those conditions, forecasters warned, can easily lead to illnesses such as heat stroke. They urged people to stay well hydrated.
The advisory was set to run from noon until 7 p.m.