Southern California will enjoy one more day of sunny, ideal weather conditions before the next storm arrives, trading sunshine for clouds, cooler temperatures and rain.

Meteorologists expect a Pacific storm system to sweep into the region late Sunday, bringing light to moderate rain across Los Angeles, Ventura, Orange and San Bernardino counties.

“The latest ensemble solutions are converging on at least 1 to 3 inches of rain for the coast and valleys with the first system Monday and 2 to 5 inches in the mountains,” the National Weather Service said. Road ponding and flooding is possible.

Light showers are likely to begin in northwest San Luis Obispo County by Sunday afternoon, spreading into SoCal by the evening. Highs will cool into the 60s across the region.

Forecasters say two upper-level low pressure systems will move through region in the first part of the week. The first will produce the highest rainfall totals, with hourly rainfall rates possibly reaching 1 inch. Rain intensity will ease Monday night into Tuesday, though scattered showers will continue.

Meteorologists expect the wettest window to stretch from Sunday night through Monday morning, with showers lingering well into midweek.

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