Indianapolis Average Temperature by Month

This page shows the average temperature in each month of the year in Indianapolis, Indiana. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Indianapolis?
In Indianapolis, Indiana, the warmest month is July, with an average daily high temperature of 85.4 °F and an average low of 66.5 °F.
What's the Coldest Month in Indianapolis?
In Indianapolis, Indiana, the coolest month is January, with an average daily high temperature of 36.2 °F and an average low of 20.8 °F.
Month Avg. High Avg. Low
January 36.2 °F 20.8 °F
February 41.0 °F 24.2 °F
March 51.9 °F 33.0 °F
April 64.0 °F 43.2 °F
May 73.6 °F 53.8 °F
June 82.2 °F 62.9 °F
July 85.4 °F 66.5 °F
August 84.4 °F 65.1 °F
September 78.3 °F 57.5 °F
October 65.7 °F 45.6 °F
November 52.0 °F 34.8 °F
December 40.6 °F 26.3 °F
Year 63.0 °F 44.6 °F
Weather Station Details
Years Station Coordinates
1948–2024 Indianapolis International Airport location
1901–1947 Whitestown location