Sierra Vista Family Medical Clinic- Urgent Care Monday-Friday 9 am-7 pm & Sat-Sun 8 am-5 pm 1227 E. Los Angeles Avenue, Simi Valley (805) 582-4050 West Ventura Medical Clinic- Urgent Care Monday-Saturday: 9 am-5 pm Sunday: Closed 133 W. Santa Clara Street, Ventura (805) 641-5600. Contact Information. Monday to Friday, 8:00 am to 5:00 pm 3147 ....