Any day is a nice day to have your windows tinted! Weather conditions during window tinting installations does not affect the final outcome of the installation (unless you're in a hurricane or tornado). We've Installed window film on days when it was 107°f as well as 8°f, rain, snow, or shine. The only thing we noticed is the curing time varies by a few hours. People find that rainy/cold days are sometimes better for window tinting because of less crowds (from weather misconceptions about installations) which means quicker turnout times for you.