A warning of excessive heat was issued Sunday in parts of Southern California, as temperatures are likely to soar into triple digits.

The National Weather Service recommends those living in extreme heat to keep hydrated, limit outdoor activities, and avoid prolonged sun exposure.

People are reminded to not leave pets or children unattended in hot cars. According to the L.A. City Emergency Management Department 38 children are killed each year when they’re left in a vehicle.

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88% of those killed are children under 3 years old, and 54% were left behind by caregivers.