A low-pressure system off the northern Baja coast will bring cooling to the San Diego Region and periods of scattered showers after the weekend’s heat.
“The cooling trend will continue through the end of the week with additional chances for precipitation on Thursday and Friday,” the National Weather Service said.
Highs on Monday were forecast to be 77 to 82 near the coast, 82 to 87 inland, 86 to 91 in the valleys, 78 to 83 in the mountains and around 96 in the deserts.
The potential rain on Monday was predicted to favor southern areas of the region with most areas receiving a tenth of an inch or less, with higher amounts possible in thunderstorms.
Precipitation was expected to start early Monday afternoon, be heaviest Monday night and end Tuesday morning, the weather service said.
As the system departs, it was expected to leave noticeably cooler weather behind with temperatures slightly below average.
By the middle and latter parts of the week, daytime highs may get close to 10-15 degrees below average for many areas, forecasters said.
City News Service contributed to this article.