The National Weather Service issued updated warnings as Southern California faced a renewed period of extreme heat and incoming monsoonal storms beginning this weekend across the Southland.
The combination of a broad heat dome over much of the continental United States and the influx of monsoonal moisture raised public-health and coastal-safety concerns. Ultimo aggiornamento: 13 luglio 2026.
Why the warnings matter across Southern California
Officials flagged risks for the very young, the very old and people without access to air conditioning as daytime highs and elevated nighttime temperatures reduce physiological recovery. The heat pattern is part of a larger event in which a heat dome is locking in abnormally high temperatures, while monsoonal flow brings higher humidity and a chance of showers and thunderstorms.
High humidity will amplify heat stress, and forecasters warned that this stretch will raise the risk of heat-related illnesses, exacerbate drought-driven wildfire potential in some areas, and increase surf and rip-current hazards along local beaches.
Timeline and geographic scope of advisories
Temperatures showed a slight drop on Friday from Thursday’s peak, prompting expiration of some early heat advisories for downtown Los Angeles, inland coastal zones and the Santa Clarita, San Fernando and San Gabriel valleys. That relief was short-lived as forecasters reinstated advisories for inland coastal sections and the major valleys from Sunday morning through Tuesday morning.
Separate advisories remained active for the San Gabriel Mountains and the corridors near the 5 and 14 Freeways where near-triple-digit readings were anticipated. Beginning Tuesday morning and lasting through Thursday evening, advisories were set to expand into a broad extreme heat watch covering almost the entire Southland, explicitly including Los Angeles County beaches and the Malibu coast.
Forecasted temperatures, nighttime heat and broader national context
Local forecasts projected valley highs up to about 112 degrees Fahrenheit and coastal highs potentially reaching 95 degrees, with overnight lows remaining unusually warm in some urbanized pockets. Meteorologists noted that the persistence of unusually warm nights—when temperatures may not drop below 80 degrees in some U.S. coastal cities—is a critical hazard because it limits physiological recovery between hot days.
The pattern affecting Southern California is part of a larger U.S. heat event in which a heat dome has produced temperatures 15 to 25 degrees Fahrenheit above normal across wide areas. That broader pattern has been linked to elevated wildfire risk where fuels remain dry and to a likelihood of numerous record high and overnight temperature records over the coming week.
Monsoonal storms, coastal impacts and public-safety concerns
Monsoonal moisture moving into the region increased the probability of showers and thunderstorms beginning Saturday night and continuing into much of next week, with chance estimates around 10–20 percent for scattered storms. Forecasters cautioned that these early-season storms can be highly variable, producing locally heavy rain, gusty winds, lightning and dry thunderstorms that can spark new wildfire starts.
A swell was expected to affect beaches through the next week, elevating the risk of dangerous rip currents and creating the possibility of minor coastal flooding during high tides. Residents were advised to avoid strenuous outdoor activity during peak heat hours, stay hydrated and use air-conditioned spaces when possible, and to check on vulnerable neighbors and relatives.
Officials continued to monitor the evolution of the heat and monsoon signals and warned the public to follow local guidance as alerts change. This story is developing and updates may follow as forecasts are refined.
