A cold storm is expected to bring rain to Beaumont, Banning and Cabazon on Wednesday and snow in the mountains on both sides of the San Gorgonio Pass.
The rain chance in the Pass is 80 percent Wednesday and 100 percent Wednesday night, according to the National Weather Service.
A cold low pressure system from the Gulf of Alaska is expected to produce wintry weather in the mountains Wednesday evening through most of Thursday, the Weather Service advised in an update Tuesday afternoon.
"The system will bring widespread rain . . . mountain snow . . . and gusty onshore winds in the mountains and deserts," the Weather Service advised. "The brunt of precipitation is expected Wednesday night into Thursday morning. Very cold air aloft may cause isolated thunderstorms to form during the day Thursday."
Daytime highs Wednesday for Beaumont and Banning are forecast around 60, with Wednesday night lows in the upper 40s. Daytime Thursday highs are expected in the low 50s. Thursday night is expected colder, with overnight lows in the upper 30s. Daytime highs Friday could peak in the low 50s.
In Idyllwild, the daytime high Wednesday is forecast around 51, with Wednesday night lows of 28. Daytime highs Thursday are forecast around 41 and Thursday night lows could plunge to 23, according to the Weather Service. Friday is expected a bit clearer but the daytime high in Idyllwild is forecast around 42.