Heat Wave Wedding

So, my wedding is this Saturday. The weather forecast is saying it's going to be 90 degrees, hot & humid with a 20% chance of isolated thunderstorms. My wedding ceremony was originally planned to be outside with my reception venue as a back up in case of rain. I did not expect this heat since the month of June in the past has been a lot cooler (we're experiencing record breaking temperatures). My ceremony will be short and sweet, but I'm really nervous that it'll be too hot. I planned on having umbrellas for shade and ice cold water for people but I feel like it's not enough. An outside wedding has always been my dream but I don't want people complaining about the heat. Thoughts?

*Please go easy on me. I'm a delicate flower with three days to go and nothing's going right.* 😖