8/14/2015 02:00 PM PDT

Heat Advisory Friday through Monday

The National Weather Service in San Diego has issued a heat advisory for the mountains and valleys and an excessive heat warning for Borrego Springs and desert areas. Both are in effect from 1pm Friday to 9pm on Monday.  Saturday and Sunday will be the hottest days with temperature as much as 10 to 15 degrees above normal.

The County operates a Cool Zones program and has designated buildings as cooling centers.

Visit www.sdcountyemergency.com or call 2-1-1 for a complete list of cooling zone locations including hours of operation.

Due to the heat warning the Borrego Springs Branch Library will be open the following extended hours: Friday 9am-7pm, Saturday 9am ? 7pm, and Sunday 12pm ? 4pm. The library is located at 587 Palm Canyon Drive Suite 125, Borrego Springs, CA 92004.