Los Angeles, California — An unseasonable surge of early-season heat will build across California starting Friday, May 8, sending temperatures well above normal and creating increasing risks for travel, infrastructure, and outdoor activity across Los Angeles, Sacramento, Fresno, Bakersfield, and San Diego.
According to NOAA’s Climate Prediction Center, temperatures will trend 70–80% above normal through May 14, with the most intense heat arriving Friday afternoon. The peak window runs from 2 p.m. to 7 p.m. Friday and again Saturday, when inland areas are expected to climb rapidly under strong high pressure.
That heat will translate into immediate impacts. Road surfaces along major corridors like I-5 and I-10 may soften during peak afternoon hours, increasing wear on vehicles and raising the risk of tire issues. In urban areas like Los Angeles and Bakersfield, heat buildup will intensify on concrete and asphalt, pushing temperatures even higher in densely developed neighborhoods.
Limited overnight cooling will add to the strain. Temperatures will remain elevated after sunset, especially in metro areas, reducing relief and increasing exposure risks for outdoor workers and those without reliable cooling.
Dry conditions combined with heat may also increase fire risk in inland and brush-heavy areas, particularly around Fresno and Sacramento where vegetation can dry quickly under sustained warmth.
This is part of a broader shift as a strong ridge of high pressure expands eastward from the Pacific, driving heat into the western United States.
Residents should limit strenuous outdoor activity during peak afternoon hours, stay hydrated, and avoid leaving vehicles or equipment exposed to direct sun. Drivers should check tire pressure and be alert for heat-related vehicle issues on long stretches of highway.
The highest risk for heat-related impacts will occur each afternoon between 2 p.m. and 7 p.m. Friday through Sunday.
