Summer weather will bathe much of the region in warm temperatures on Tuesday, with overnight thunderstorms likely in some mountainous and desert areas through the middle of the week.

A heat advisory will be in effect until 8 p.m. in valleys in San Diego County, including Escondido, El Cajon, San Marcos, La Mesa, Santee and Poway, according to the National Weather Service. Temperatures in these areas are expected to be in the upper 90s, possibly reaching 100 degrees.

“Drink plenty of fluids, stay in an air-conditioned room, avoid the sun, and watch your loved ones and neighbors,” the National Weather Service warned. “Young children and pets should not be left unattended in vehicles under any circumstances. Take extra precautions if working or spending time outdoors.”

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A graphical image shows the 10-day extended weather forecast for June 28, 2022.

Hot weather can cause heat-related illnesses. The San Diego County Health and Human Services Agency recommends the following tips for staying cool and beating the heat:

  • Stay hydrated with water. Avoid sugary drinks
  • Check friends and neighbors at high risk for heat-related illnesses
  • Stay cool in an air-conditioned space
  • NEVER leave children or pets in a locked, parked vehicle
  • If you go out, remember: wear a hat; wear loose, lightweight, light-colored clothing; use sunscreen (SPF 15 or higher); and bring water
  • Limit the time spent outdoors. Take frequent breaks

If you need to escape the heat, San Diego County has a Cool Zone program. The Supervisory Board started the program out of concern for the elderly, people with disabilities and people with health conditions that could be complicated by the effects of heat.

To find a cool area near you, check out this interactive map.

The county, in partnership with SDG&E, is providing free electric fans to people aged 60 and over, disabled or living on a limited income. To be eligible, a resident must not have access to air conditioning in their residence. To learn more about the Cool Zones ventilator program or to request a ventilator, please call 2-1-1.

If you or someone you know can’t get to a cold area and need help with transportation, you can call 2-1-1 to be connected to a toll-free ride or ride-sharing service. .

Forecasters noted that monsoon moisture accumulating in the region will bring risks of thunderstorms in the afternoon and early evening in mountainous and desert areas through Tuesday. An isolated thunderstorm Sunday over southeastern San Diego County produced 17 cloud-to-ground lightning strikes and 94 cloud lightning in about 30 minutes, forecasters said.

“Thunderstorm chances on Wednesday begin to diminish as a trough of low pressure approaches the west coast, drying the atmosphere and cooling conditions over the holiday weekend,” according to the NWS. “Low clouds and fog at night and morning are expected daily near the coast.”

Photograph of NBC 7 meteorologist Sheena Parveen discussing the early warning forecast which includes a possible storm near Pine Valley, June 28, 2022.

NBC 7

Photograph of NBC 7 meteorologist Sheena Parveen discussing the early warning forecast which includes a possible storm near Pine Valley, June 28, 2022.