A heat advisory is in effect from 9 a.m. to 7 p.m. Thursday for southeast Louisiana, including the Baton Rouge and New Orleans areas.
Strong high pressure leading to fewer storms and less cloud coverage will result in hot daytime temperatures, the National Weather Service said. Maximum heat index values will be between 105 and 110 degrees in the afternoon.
Heat index is how hot it feels outside when temperature and humidity are combined.
At that heat index level, people need to take precautions during outdoor activities against sunstroke, muscle cramps or heat exhaustion. People should drink more nonalcoholic fluids, take frequent breaks in activities and rest in shady areas when possible, according to the Centers for Disease Control and Prevention.