A few showers and thunderstorms rolled across San Diego County early Sunday morning with Barona recording 0.04 inches of rain, and Alpine and Ramona recording 0.01 inches, the National Weather Service said.
An excessive heat warning was issued until 8 p.m. Sunday for San Diego County deserts, including Borrego Springs, with dangerously hot conditions and temperatures up to 114 degrees expected. Extreme heat can significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities.
A beach hazards statement was issued through Sunday evening for county coastal areas with elevated surf of 3 to 5 feet with sets to 6 feet and a high risk of rip currents, which could create dangerous swimming conditions.
Strong high pressure over the Southwest was predicted to bring hot summer weather inland while sea breezes and a shallow marine layer could keep coastal areas much cooler.
High temperatures along the coast Sunday were predicted to be 73 to 78 degrees, 83 to 88 in the western valleys, 93 to 98 near the foothills, 91 to 100 in the mountains and 109 to 114 in the deserts, according to the weather service.
Monsoon flow was expected to bring chances for showers and thunderstorms to the entire region through Monday, the NWS said.
Hot, dry weather returns Tuesday through Friday, followed by cooling next weekend as the upper high over the Southwest weakens.
City News Service contributed to this article.