Troughing will happen Wednesday and Thursday bringing temperatures down about 20°. There will be a slight chance of drizzle, but rain totals will be less than a 10th of an inch. High pressure builds again by Friday, bringing warmer weather for the weekend. Models hint at another low-pressure system, strong enough to break down the ridge, moving through by mid-next week. This system will be colder with strong gusty winds. A countywide cool down will lead to a 15 to 20-degree drop in temperatures from Monday compared to Thursday. There is also a chance for spotty showers Thursday, but rain totals will be less than a 10th of an inch. High pressure will build again by Friday, bringing warmer weather for the weekend. MORE: https://www.cbs8.com/article/weather/forecast/san-diego-weather-update/509-addbcd08-0811-489a-b511-7cd202ccde99