Here is the current weather forecast (and outlook) for Indio, CA (zipcode 92201) provided by Accuweather. You can use this page to get a good idea of the kind of weather to expect during the 3 day weekend of the festival (it would be a safe bet that it's going to be hot and sunny). You will also find the current moon phase for Indio, CA (aka the Northern Hemisphere) on this page as well, so you'll know what kind of night to expect beneath the stars.