Indianapolis, IN – The upcoming week in Indianapolis brings a mix of rain, sunshine, and cooler temperatures. Here’s a day-by-day breakdown of what to expect:. Showers are expected, primarily after midnight, with temperatures falling to around 53°F. East-southeast winds will be light at 7 to 9 mph, with gusts up to 18 mph. Rain chances are high at 90%, with rainfall likely between a quarter and half an inch.