The Atlanta Journal Constitution Peachtree Road Race is expected to start with temperatures in the upper 70s and high humidity.

“We are going to start warm and humid,” Channel 2 Action News Meteorologist Brian Monahan said. “The humidity will build and the temperatures will rise. I do expect a dry race.”

Monahan said it is expected to be in the upper 70s at the start of the race before temperatures reach the upper 90s by the afternoon. By the end of the race, temperatures should be in the upper 80s, according to the National Weather Service.

A heat advisory has been issued to start at around 1 p.m. today through 7 p.m., with a heat index expected to be between 105 and 109 degrees throughout metro Atlanta and South Georgia, Monahan said.