The National Weather Service office in San Diego said a slowly moving low-pressure system will cool down the region this weekend and bring a slight chance of rain.
“A widespread cool down is expected Saturday and Sunday,” the weather service said. “Temperatures will be 5 to 10 degrees below average — locally up to 15 degrees below average in some mountain and inland valley areas.”
Weekend highs will be in the mid to high 60s along the coast and just a few degrees warmer inland.
Highs in the mountains will drop from the 70s on Saturday to the 60s on Sunday amid gusty winds. The deserts will be in the 90s on Saturday and 80s on Sunday.
A deepening marine layer will cause a slight chance of light precipitation west of the mountains and on coastal mountain slopes Saturday night into Sunday morning.
The weather will then turn warmer and drier through the middle of next week.