A Heat Advisory issued by the National Weather Service took effect Monday morning for San Diego County, running through 8 p.m. Friday, March 20. Forecasters warn that temperatures this week are expected to run 20 to 30 degrees above normal for mid-March, with potential to break numerous March temperature records across the region.

In inland communities like Santee and El Cajon, high temperatures are forecast to reach 95 to 105 degrees Fahrenheit between Tuesday and Friday. Coastal areas will see highs in the 80s to low 90s. Desert regions east of the county could approach 109 to 112 degrees. The hottest days are expected Thursday and Friday, when multiple March temperature records could fall.

Health officials warn of a high risk for heat-related illness, particularly for outdoor workers, seniors, young children, and pets. Residents are urged to stay hydrated, limit outdoor activities to early morning and evening hours, and never leave children or animals in unattended vehicles.

For those without air conditioning, cooling centers are available at county libraries, community centers, and indoor malls throughout the region. Santee residents can also visit Santee Sportsplex or the Santee Library, 9225 Carlton Hills Blvd., during operating hours.

The advisory follows a brief cool-down over the weekend after a previous heat wave last week. Forecasters say a ridge of high pressure building over the region is responsible for the prolonged heat, which is expected to ease by the weekend of March 21-22.