San Diego Weather: Sunny Sunday, Windy Monday

SAN DIEGO, CA — San Diegans can expect Sunday to be sunny and mild after a chilly morning. But Santa Ana winds were expected to rip through the region Monday and Tuesday with very low humidity in the mountains, valleys and coastal areas, according to the National Weather Service.

Mid-and high-level moisture will increase Sunday evening and Monday as an upper trough over Oregon travels south across California before stalling off the coast of northern Baja Monday night, forecasters said.

High temperatures in coastal areas Sunday were expected to hover at 66-71 degrees with overnight lows of 41-48, NWS officials said. Valley highs will be 73-78 with overnight lows of 44-51.

Mountain highs were expected to be 62-69 with overnight lows of 36-46. Highs in the deserts will be 73-78 with overnight lows of 45-55.

On Monday night and Tuesday, red flag conditions will be most widespread when the strongest Santa Ana winds arrive and the relative humidity plummets into the single digits.

Monday will cool down in the deserts, mountains and inland valleys as a surge of cold air moves in from the north, the NWS said. Tuesday and Wednesday will warm up again, especially west of the mountains with temperatures rising up to the 80s in some spots.

A weak trough will pass to the north on Thursday and Friday, bringing some weak onshore flow and a few degrees of cooling.

The City News Service contributed to this report.