It depends. Some electric coolers may be waterproof, but they’re not necessarily. While they do have a tight seal for insulation purposes that would keep the rain out, many electric coolers have exposed electric elements.
For example, the Kohree Portable Refrigerator has a USB port on the top of the unit for charging your cellphone or other small electronics. It would be a bad idea to leave this in the rain. Even Dometic electric coolers are only splashproof, and the company does not recommend leaving the coolers exposed to continuous rain or flooding.
If you’re looking for a waterproof cooler you can confidently leave outside, check out the fully weatherproof ARB Element. This cooler is similar to the ARB Zero that we reviewed above, but it has a few notable differences.
Not only is this electric cooler extremely rugged, but it also has an electronic locking system to protect your food. It’s a bit more expensive than the Zero when you compare coolers of the same capacity, making it by far the priciest model on this list. If you need the ability to store your food in the bed of your trunk or outside a tent, this electric cooler would be worth the cost.