A rescue dog models a unicorn Halloween costume at the Surf Dog Surf-a-thon in Del Mar. Photo by Chris Stone
A rescue dog in a unicorn Halloween costume. Photo by Chris Stone

Dry, mild weather is predicted for San Diego County on Monday with a storm bringing wind, cold weather, rain and snow in the mountains coming Wednesday and Thursday, the National Weather Service said.

Halloween day is expected to be a lot like Sunday, with generally clear skies and temperatures near their seasonal norms, forecasters said.

Highs were forecast to be in the lower 70s near the coast, the mid 70s inland, around 80 in the valleys, upper 60s in the mountains and mid 80s in the deserts.

Temperatures will drop into the 50s in most areas overnight, with patchy fog along the coast and partly cloudy conditions elsewhere.

Tuesday was predicted to be cooler as a trough develops along the West Coast and a coastal eddy deepens the marine layer. High pressure building in behind the storm on Friday was expected to bring dry, warmer weather next weekend.

No hazardous marine weather was expected through Tuesday. A Pacific storm system was expected to bring gusty west to northwest winds and choppy seas Wednesday and Thursday.

A building short period west-northwest swell was predicted to generate elevated and rough surf and a high risk of rip currents Wednesday night into early Friday morning.

City News Service contributed to this article.