Low coastal clouds
Low clouds looking west from Otay Mountain on Monday morning. Courtesy UCSD HPWREN network

Below-average temperatures were expected in San Diego County for much of this week before gradual warming into next weekend, the National Weather Service said Sunday.

“Fair and relatively cool weather will continue most of this week,” the weather service said. “Areas of low clouds will continue during nights and mornings west of the mountains.”

Periods of gusty west winds were expected each afternoon and early evening through mid-week, forecasters said. Dry conditions were predicted to continue with night and morning low clouds.

High temperatures Monday were predicted to be in the upper 70s along the coast, lower 80s in the valleys, upper 70s in the mountains and upper 90s in the deserts, according to the weather agency.

A trough along the West Coast was expected to be the main influence on San Diego County’s weather as a low-pressure system slowly makes its way inland before moving off to the northeast Thursday.

The pattern was predicted to bring below-average temperatures and periods of gusty west winds in the afternoons and evenings through Wednesday.

The strongest winds were expected below passes and on desert mountain slopes with peak gusts of 35 to 45 mph, the NWS said. Marine layer low clouds were predicted each night and morning.

Some degree of warming for the end of the week was predicted into the weekend.

Periods of breezy northwest winds around 20 knots were possible over the coastal waters at times this week, most likely Tuesday and Wednesday during the afternoons and evenings.

Updated at 7:55 a.m., Monday, Sept. 19, 2022

City News Service contributed to this article.