A high-temperature record that had stood for 42 years was broken Sunday in the Coachella Valley. According to Brandt Maxwell, a meteorologist with the National Weather Service in San Diego, Sunday's high of 121 broke a record of 120 from 1979. The Coachella Valley remains under an excessive heat warning issued for the southwestern region of the state until 9 p.m. Monday. Palm Springs also set three record high temperatures last week during an extended heatwave, including tying the city’s all-time hottest temperature of 123 degrees on June 17. Cooler weather will arrive by Tuesday with midweek temperatures between 100 and 105 degrees, but Maxwell said it will be more humid due to moisture moving in from the southeast.