The bad news: this is the little symbol currently appearing next to our wedding date in the 10-day forecast, along with a 60% chance of rain. The good news: the 10-day forecast is almost always wildly wrong! :)
Actually, I am much more worried about it raining on Thursday night or Sunday morning (the bbq at our house with the parents and the brunch at our house). We did get a canopy-type tent for the backyard that will keep off a light-medium rain (or shelter guests from the mid-day sun) but our house will definitely be crowded if it pours!
But, in general, if you are getting ready to travel to Indy for the wedding next week, expect highs of around 80 and lows of around 60. And bring your raincoat just in case ... this is early summer in the Mid-west and thunderstorms tend to spring up suddenly around 4 pm at least 3-4 days a week.