Updated 8:57 p.m. Saturday with lows of 37 to 47 degrees forecast along the coast, not 237 degrees.
Frost is likely in San Diego County’s wind-sheltered valleys overnight as temperatures drop into the high 20s and 30s, forecasters said.
The frost could cause some overpasses and bridges to become icy and potentially hazardous for motorists, as moisture condenses and freezes on the
road surface, according to the National Weather Service.
It also could pose a threat to sensitive plants and crops, forecasters said.
Officials with the weather service issued a frost advisory set to go into effect at midnight and extend until 8 a.m. Sunday.
The overnight temperature in the valleys was expected to be mostly in the 30s, but the coldest spots could be in the upper 20s briefly, forecasters said.
Lows of 37 to 47 degrees are expected tonight along the coast, 25 to 35 degrees in the mountains and 40 to 48 degrees in the deserts, according to the NWS.
Forecasters expected frost again Sunday night into Monday morning in
areas west of the mountains.
-City News Service