San Diego County faces a stretch of intense heat, with warm nights offering limited relief. The National Weather Service has issued an extreme heat warning for coastal communities and inland valleys from 10 a.m. Friday, October 2, through 8 p.m. Thursday, October 8, 2026.

Temperatures near the coast are forecast to reach the mid-80s to lower 90s Fahrenheit. Coastal mesas and higher terrain could climb into the mid-90s to around 100, while inland valleys could see highs from the upper 90s to 106.

Overnight temperatures will remain elevated, mostly in the lower to mid-70s along the coast and the upper 60s to mid-70s in the valleys. Warnings also cover Orange County and the Inland Empire.

The NWS advises residents to drink plenty of fluids, spend time in air-conditioned spaces, and avoid direct sun. Residents should check on relatives and neighbors, and never leave children or pets unattended in vehicles.

Households preparing for the heat can also take steps to manage electricity use. San Diego Gas & Electric recommends cooling homes earlier in the day, then setting thermostats to 78°F or higher between 4 and 9 p.m., provided health and comfort allow. Reducing electricity use during those hours can help ease demand on the grid.

Keeping window coverings closed during daylight hours can reduce heat entering the home. When outdoor conditions are cooler, opening windows overnight or early in the morning can help bring in fresh air. SDG&E provides additional guidance on its energy-saving tips page.