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(FOX 11) - Here are a list of cooling centers open in Southern California amid the excessive heat warning issued this week:

LOS ANGELES COUNTY: http://lacoa.org/PDF/coolingcenters.pdf

ORANGE COUNTY: https://www.211oc.org/resource-centers/extreme-heat-cooling-centers.html

RIVERSIDE COUNTY: https://www.capriverside.org/Portals/0/PDF/Cool/2018%20Cool%20Center_Directory.pdf

SAN BERNARDINO COUNTY: https://211sb.org/wp-content/uploads/2018/06/Cool-Places-to-Go-2018.pdf

The hottest days of the heat wave are expected to be Tuesday and Wednesday, according to a National Weather Service statement. Overnight low temperatures will offer little reprieve from the heat, ranging from 66-76 degrees.

Southern California residents were urged to take steps to protect themselves from the conditions, scheduling strenuous activities for the coolest part of the day -- in the morning or evening -- wearing lightweight and light-colored clothing and drinking plenty of water.

The California ISO issued a statewide Flex Alert calling for voluntary electricity conservation from 5 p.m. to 9 p.m. Tuesday and Wednesday.