The short answer is no — insurance companies don’t offer true weekend-only car insurance. The shortest standard policy term is typically six months, and offers for one-day or one-week coverage are often misleading or not from reputable providers. That said, if you only need coverage for a short period, there are legitimate alternatives.
You can purchase a standard policy and cancel it early, or consider rental car insurance if you're driving temporarily. Non-owner insurance is a good option if you don’t own a car but still need proof of coverage. Usage-based or rideshare insurance may also be worth exploring, depending on your driving habits.