Is a gloomy, rainy day causing slow sales? Try putting a sign outside of your store on the sidewalk; visible to those walking by or at the pumps. List items that pair with the weather. For example “Rainy Day? We are always open! Umbrellas, RainX ®, Coffee, Hot Pizza, & more. Come dry off and grab a delicious snack”.
Use cardboard and a visible marker for practically no cost at all.
If you have extra marketing funds, a better idea would be to create and laminate poster size signs for different needs of attracting customers; weather, open on holidays, special offers (Hot Dog & Soda for one price). Also, you can buy a sign with an erasable board. Your goal is to bring customers in the door and signage is the first impression your customers receive. You can purchase signs and sign holders on signage websites (Google: Sidewalk signs or store signs) and at a Home Depot or Lowes. A sidewalk sign is called an A-FRAME sign.