Indianapolis weather in September
Long-run climate averages for Indianapolis, IN in September, plus what the forecast models say for the days ahead.
In September, Indianapolis averages 79°F by day and 60°F at night. The wettest month is usually March.
September in Indianapolis averages a daytime high of 79°F and an overnight low of 60°F, which reads as warm for this part of the world. Across the whole year Indianapolis sees roughly 42 inches of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live Indianapolis forecast with every model compared and how much they currently agree.
Indianapolis weather by month
what to expect in Indianapolis through the yearHere is Indianapolis's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Indianapolis by season.