Prolonged Heat Wave to Peak This Week Across Southern California, Raising Risk of Heat-Related Illness

A prolonged heat wave continues across Southern California and is expected to peak Tuesday through Friday this week, bringing dangerous temperatures and an increased risk of heat-related illness.

According to the National Weather Service (NWS), temperatures are expected to run 20 to 35 degrees above normal, with several March records at risk.

This heat event is expected to push temperatures far above seasonal averages, with some areas forecast to approach or exceed 100°F.

The prolonged heat wave continues, and is still on track to peak Tuesday through Friday this week. Temperatures will continue to be warm overnight, and may not provide much relief to heat stress overnight. What have you done to prepare for the heatwave? #CAwx #Socal #LA #Heat pic.twitter.com/ttn3eptI6H

— NWS Los Angeles (@NWSLosAngeles) March 16, 2026

According to the NWS forecast, a strengthening high-pressure system over the region is driving the unusual early-season heat. As the system builds, temperatures are expected to rise across much of Southern California.

The NWS said the March heat event could be historic, as atmospheric levels may surpass records observed since 2006, potentially making it one of the most intense early-spring heat events on record.

The NWS has issued Heat Advisories and Extreme Heat Warnings for parts of California. Communities across Santa Barbara, San Luis Obispo, and Ventura counties remain under these alerts as extreme heat is forecast.

The NWS forecasts that the most intense heat will occur from Tuesday through Friday, when the risk of heat-related illness will be highest for many residents.

Under the Heat Advisory, daytime temperatures are expected to range from 90°F to 98°F. In areas under an Extreme Heat Warning, conditions could be even more severe, with temperatures reaching 96°F to 104°F.

During this period, heat risk is classified as high for most populations, particularly those spending long periods outdoors. The most dangerous conditions are expected between 10 a.m. and 8 p.m., when temperatures typically reach their peak.

Relief from the extreme heat may arrive later in the week, as the strong high-pressure system is expected to begin weakening by Saturday.

As a result, temperatures are expected to gradually fall, with a more noticeable drop likely by Sunday. However, forecasters say no significant storms are expected across Southern California through the end of the month.

Meanwhile, the City of Goleta has also warned residents about the high temperatures expected this week. The City is urging residents to take precautions during the extreme heat.

People are encouraged to drink plenty of fluids, stay in air-conditioned spaces when possible, and avoid strenuous outdoor activity during the hottest hours. Residents should also check on elderly neighbors and others who may be vulnerable to extreme temperatures.

Outdoor workers are advised to take frequent breaks in shaded or cooled areas and remain hydrated. Wearing lightweight, loose-fitting clothing can also help reduce heat exposure.