It's the time of year when Inland Southern California becomes a 27,000-square-mile skillet. We asked UC Riverside physicians how to stay safe and hydrated.

The United States border has seen an increase in families — primarily men with their children — and most recently a surge in unaccompanied minors traveling north from Central America through Mexico. They are fleeing gang violence, high homicide rates, and lack of economic opportunities. In some cases, such as...