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California Faces Unusual Weather Patterns Amid Hurricane Priscilla’s Impact

September 2025, California – California is experiencing unusual weather patterns this month, marked by increased precipitation and mild temperatures across the state.
Multiple episodes of rain, along with thunderstorm activity, have particularly affected central and southern regions. The remnants of Tropical Storm Mario contributed to local downpours, leading to debris flows in southeastern California’s lower deserts. Despite less dramatic rainfall in other areas, the weather has been atypical for September.
Temperatures throughout California have remained mild, although notably higher than the long-term averages. The Central Valley and other regions recorded some of the warmest September conditions in the past 130 years. This warmth is linked to an unusually high marine heatwave extending from the West Pacific to California’s nearshore waters.
Fortunately, the rainfall, along with light winds, has resulted in lower fire activity across the state. In contrast, the Pacific Northwest and parts of British Columbia experienced unusual late-season heat, contributing to forest fires through early October.
As the weekend approaches, weather patterns are shifting again. The remnants of East Pacific Hurricane Priscilla are forecasted to bring moderate to heavy rain to the lower Colorado Basin and southern California along with isolated thunderstorms. Some regions may receive 2-3 inches of rain, raising concerns for flash flooding.
As the active weather continues, the potential for ongoing precipitation exists into next week. A low-pressure system setting up northwest of California could bring early-season rain events to northern and central regions. However, the forecast remains uncertain due to disruptions caused by a recurve of a West Pacific typhoon.
Looking forward, ongoing marine heatwave conditions and a developing La Niña event could significantly affect California’s weather this autumn and winter. Though a cooler-than-average tropical ocean may counteract effects, heightened evaporation could provide more water vapor for storms in the coming season.
For the latest updates on Hurricane Priscilla and weather developments across California, communities are encouraged to stay informed and prepared.