Heat advisory: San Bernardino County warns of dangerous temperatures this week

San Bernardino County has issued a heat safety advisory for the week of September 6, 2026, warning that summer heat "can become dangerous very quickly"^[1]. Big Bear Valley's higher elevation offers some relief compared to the valley floor, but midday and afternoon temperatures can still pose risks — particularly for older adults, children, and pets.

The county advises residents to drink plenty of water throughout the day, limit outdoor activity during the hottest afternoon hours, wear lightweight light-colored clothing, and take frequent breaks in shaded or air-conditioned spaces^[1]. Critically, residents should never leave children, older adults, or pets inside a parked vehicle — even briefly — and should check in on neighbors or family members who may be especially vulnerable^[1].

San Bernardino County Library branches are available as free cooling locations, offering air conditioning, Wi-Fi, and other resources^[1]. A full list of designated county cooling centers is available through the San Bernardino County Department of Public Health website, and additional heat preparedness tips can be found at prepare.sbcounty.gov (opens in a new tab)^[1].