Flooding triggered by the remnants of Tropical Storm Mario caused the death of a 2-year-old in the city of Barstow, California, after he got swept away by the floodwaters on September 18, 2025. The fatality was confirmed by the police on September 19, after the body of the deceased was found in a flood control channel in the area.
Remnants of Tropical Storm Mario brought widespread rainfall to California and the Desert Southwest on September 17–18, 2025, prompting water rescues, triggering mudslides, and flash flooding across the region.
Moisture from post-tropical Mario is forecast to spread into southern California on September 18, 2025, bringing thunderstorms and rainfall totals of 25–75 mm (1–3 inches) through Friday. Rainfall rates may exceed 25 mm/h (1 inch/h), prompting Flood Watches and Flash Flood Watches across much of the region. Arizona and New Mexico are also expected to see widespread showers and thunderstorms with localized flooding into September 19.
A lightning-sparked wildfire known as Garnet Fire entered the McKinley Grove of giant ancient sequoias in California’s Sierra National Forest on September 8, 2025. Firefighters reported ember ignition in upper branches but no complete canopy burn. Containment stands at about 15% after burning 22 000 ha (55 000 acres) since igniting on August 24.
A fast-moving wildfire erupted in Lakeside, San Diego County, California at around 15:00 LT on September 8, 2025, burning 2.1 ha (5.3 acres), destroying six mobile homes, and injuring two people before firefighters contained it overnight.
The 6-5 Fire, part of the TCU September Lightning Complex, has burned more than 2 400 ha (6 000 acres) in Tuolumne County, California, since igniting on September 2, 2025, destroying at least five homes in the historic settlement of Chinese Camp and forcing evacuations. Containment remains at zero percent.
More than a dozen roads in Imperial County, California were shut down on August 26, 2025, after severe monsoonal storms triggered flash floods, road erosion, and power outages across the region.
The Garnet and Dillon wildfires have grown rapidly over the past 3 days, burning through more than 4 000 ha (10 000 acres) of land in Fresno and Siskiyou counties as of August 27, 2025.
The Pickett Fire has burned 2 642 ha (6 531 acres) of land north of Calistoga, Napa County, California, since August 21, 2025. Nearly 200 residents have been forced to evacuate, and multiple prominent wineries in the Napa Valley are under threat.
A M4.0 earthquake struck The Geysers geothermal field in northern California at 12:48 UTC (05:48 LT) on August 14, 2025, followed by more than 85 aftershocks through the evening.
