Forecasted peak wind gusts for Wednesday December 18, 2024. Coast: 15-20 MPH, San Diego County Valleys: 15-25 MPH, Inland Empire: 20-45 MPH, Santa Ana Mountains: 30-50 MPH, San Bernardino County Mountains: 20-50 MPH, Riverside County Mountains: 15-45 MPH, San Diego County Mountains: 20-40 MPH, Deserts: 15-25 MPH.