Monday, July 20, 2026, started on the sticky side in Downtown Los Angeles, with muggy, mostly cloudy skies and a mild 68°F. That early hint of comfort will not stick around for long. Forecasters say the week is on a steady warmup track, with mid 80s expected by this afternoon and inland neighborhoods climbing into the 90s and flirting with triple digits later in the week.
Heat Builds Day by Day
Temperatures are set to climb through the workweek, with a high near 86°F on Monday, then the upper 80s on Tuesday and Wednesday, and around 91°F by Thursday. According to the National Weather Service, that pattern could grow into a long and potentially dangerous heat wave that lingers into early next week. The warmest inland spots may reach about 104–107°F, and overnight lows will stay well above normal, which means very little cooling after sunset.
Cooling Centers and Help Finding Relief
The city operates cooling centers, libraries, and recreation sites that open during heat events and also runs hydration and outreach programs to help people reach cooler indoor spaces. If you or someone you look after is especially vulnerable, including older adults, infants, or anyone without air conditioning, you can check local cooling listings or call 211 for nearby locations and hours, according to City Emergency Management.
Coast, Valleys, and Rougher Surf
A shallow marine layer, held to roughly 1,000 feet, will help keep beaches and the immediate coast noticeably cooler while inland valleys heat up. The National Weather Service notes that inland highs of 90–103°F are possible by midweek, and that lower mountain and far interior areas could top out near 100–103°F. A High Surf Advisory and Beach Hazards Statement remain in effect through 11 PM PDT on Tuesday, July 21, 2026, and mariners are advised to watch for small craft conditions in parts of the Santa Barbara Channel this week.
Staying Safe When Temperatures Spike
Health officials recommend avoiding strenuous outdoor activity during the hottest hours, drinking plenty of water, and checking on neighbors who may not have access to cooling. If you do not have a cool place at home, plan to spend the peak heat of the day in a library, recreation center, or other cooling site, and call 211 for help or for the latest list of available cooling centers.
