Temperatures today will be much cooler as an area of low pressure dips through the region bringing cooling, areas of gusty winds, rain, and snow for local mountains.
This system will move down California over the course of the day. We will already see rain developing west of the mountains by the later morning and afternoon.
The biggest chance for the Coachella Valley to see some rain will be Monday. Especially during the morning commute for most people. There will be a slight chance this afternoon by 4 p.m. to pick up on some showers but the bulk of the activity will move in Monday.
A Winter Weather Advisory has been issued for our local mountains and areas of the high desert, including Yucca Valley, Twentynine Palms, and Idyllwild. The time frame for the mountains will be 10 p.m. tonight through 4 a.m. Tuesday for areas above 4000 ft. in elevation. For areas of the high desert, including Yucca Valley and portions of Joshua Tree National Park, the time frame will be 4 a.m. through 4 p.m. Monday. Snow is expected and roads will be slippery Monday morning. Visibility can also be reduced at times. Areas could see up to 8" of snow above an elevation of 6000 ft. for the mountains. In the high desert near 1-2" of snow is possible with up to 6" possible for parts of Joshua Tree National Park.
Areas shown below in pink highlight a Winter Storm Warning. This is only for the San Bernardino mountains, including Big Bear. Here, heavy snow up to 12" can be expected above an elevation of 5500 ft. Gusty winds are also possible up to 50 mph.
Temperatures will remain in he 60s through Tuesday, where some rain chances remain for the morning hours Tuesday. Then expect temperatures to warm back up near average for the remainder of the week.