A 10 to 20 percent chance for rain and thunderstorms continues into Saturday evening and overnight into Sunday morning.
Highs along the coast Saturday were in the low 70s and in the upper 60s inland.
A beach hazard statement is in effect until 10 p.m. Sunday with an elevated surf and strong rip currents. "There's a risk of cloud-to-water lightning, so you don't want to be in the water when that happens," NBC 7's Liberty Zabala said.
By Monday morning, a fire weather watch will be in effect until Tuesday evening and wind gusts could get up to 60 mph.
Friday evening, thunderstorms brought lightning, hail and showers to some parts of the county and even forced a delay at San Diego State's game against Air Force.
With SDSU leading 14-9 at the 5:50 minute mark in the third quarter, referees called a 30-minute delay to wait for aggressive lightning in the Mision Valley area to subside. After a second 30-minute delay, the teams took the field and finished the game.
NBC 7's First Alert Live Doppler radar showed a strong pocket of rain in the heart of San Diego along State Route 94 between Coronado and Interstate 15 at around 8:15 p.m.
By 10:30 p.m. the strongest parts of the storm had moved east, with the heaviest rains centered over Temecula and east of Escondido.
Smaller pockets were also showing above the Grantville and San Carlos neighborhoods, and in Vista and Bonsall in the North County.
NBC 7 weather reporter Llarisa Abreu said moisture over Mexico from Tropical Storm Sergio was making its way over California and the United States, which would make way for showers late Friday.
Rain some parts of the city of San Diego is expected to last overnight until 8 or 9 a.m. Saturday.
The highest rainfall totals in the county as of 10:30 p.m. Friday were .57 inches in Valley Center, .55 inches in Ramona, .41 inches in Oceanside, .39 inches in Fashion Valley, and .37 inches at the airport. The National Weather Service said there were more than 170 lightning strikes in San Diego County.
San Diego Gas and Electric was reporting several minor power outages across the county. Check the utility's outage map to learn details of outages in your area.
An Airport Weather Warning was in effect for San Diego International Airport for cloud-to-ground lightning from 8:15 p.m. to 9:30 p.m., according to the NWS.
In the North County, weather forced the cancellation of several high school football games, according to the Poway Unified School District.
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