Below normal temperatures are in the long range forecast according to the NWS.

.LONG TERM /Friday through Monday Night/...

Issued at 349 AM EDT Tue Sep 18 2018

A cold front will enter central Indiana on Friday, increasing
shower and thunderstorm chances, the highest being during the
afternoon. As the front sinks farther south though, anticipate dry
air to filter in behind it by Friday night and Saturday. As a
result, will not trend above the low chance pops, yet, that the
latest blended initialization is producing. The front will
eventually stall to the south, keeping low shower and thunderstorm
chances in the forecast through the weekend before shifting back
north as a warm front early next week. Meanwhile, temperatures
through the period will remain well above normal through Friday
before dropping below normal on Saturday through the end of the
forecast period behind aforementioned front.