California Weather Alert: San Diego Faces Thunderstorm Threat by Wednesday Night, September 17

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San Diego, Calif. – Drivers in San Diego should prepare for reduced visibility tonight as patchy fog settles in, with storm chances building midweek. Officials urge caution on I-5 and other coastal routes where fog and slick roads could cause delays.

According to the National Weather Service, skies clear Tuesday with highs near 83, but clouds increase by evening. By Wednesday, a 20% chance of showers and thunderstorms arrives, with another round possible Wednesday night and Thursday. Winds may gust up to 20 mph, adding hazards for high-profile vehicles along I-8 and I-15.

Residents should charge devices, secure outdoor items, and monitor local alerts. Thunderstorms may bring brief downpours, lightning, and travel slowdowns. Commutes Wednesday and Thursday morning could be affected, especially near downtown San Diego and coastal neighborhoods.

Sunny breaks are expected Tuesday before conditions turn unsettled again. Inland communities like Escondido and El Cajon may see stronger winds, while coastal areas face lingering fog during overnight hours.

The unsettled weather pattern signals the seasonal shift into fall. More storm systems could develop as September progresses, bringing additional chances for rain across Southern California.

The National Weather Service advises monitoring updates through Thursday as conditions evolve.