LOS ANGELES — Humidity is rising along with the mercury, making for a muggy and hot week across Southern California.

The National Weather Service on Monday issued an excessive heat warning for valley, mountain and desert areas around greater Los Angeles. Temperatures could reach 109 degrees in the Antelope Valley.

Hot and humid conditions will persist into next weekend, and forecasters say there will be little relief even during overnight hours.

A heat wave is also enveloping much of Northern California, where areas north of San Francisco will see temperatures in the 90s and even topping 100.

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