Extreme Heat Warning Issued for Los Angeles Amid Tropical Humidity
The National Weather Service has issued an Extreme Heat Warning for Los Angeles County, including the San Gabriel Valley, effective from 8 AM to 8 PM on Wednesday, September 9, 2026. This warning follows a Heat Advisory that began on Tuesday morning and will continue through Thursday evening. The region is experiencing unusually high humidity due to lingering tropical moisture from former Hurricane Marie, which has combined with a high-pressure system to create dangerous heat conditions. Temperatures are expected to peak at 98°F (36.7°C) on Wednesday, with heat index values exceeding 100°F (37.8°C) due to dew points reaching near-record levels of 77°F (25°C). Overnight lows will remain in the low 70s°F (21-22°C), providing little relief from the heat. Scattered thunderstorms and heavy downpours were reported Tuesday morning, with lightning temporarily closing Los Angeles County beaches.