Indianapolis Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Indianapolis, Indiana during each month of the year.

The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in Indianapolis, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1981 to 2010 weather.

10-year temperature averages for Indianapolis, 2010 to 2019
High °F Low °F   High °C Low °C
35 20 January 2 -7
40 24 February 5 -5
52 33 March 11 1
65 44 April 18 7
75 56 May 24 13
83 64 June 28 18
86 68 July 30 20
85 66 August 30 19
79 59 September 26 15
66 47 October 19 8
51 34 November 11 1
41 27 December 5 -3
63 45 Year 17 7
30-year temperature averages for Indianapolis, 1981 to 2010
High °F Low °F   High °C Low °C
36 21 January 2 -6
40 24 February 5 -5
52 33 March 11 0
63 43 April 17 6
73 53 May 23 11
82 62 June 28 17
85 66 July 29 19
84 64 August 29 18
78 56 September 25 13
65 45 October 19 7
52 35 November 11 2
39 24 December 4 -4
63 44 Year 17 7

Days of Hot Weather in Indianapolis

Indianapolis typically gets two weeks of high temperatures spread out across the summer. On those days, highs peak in the 90s Fahrenheit. Only once a decade on average does the thermometer climb into the 100s F (over 38 °C).

Days per month in Indianapolis of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 0 0 0
February 0 0 0
March 0 0 0
April 9 2 0
May 20 7 0
June 29 20 3
July 31 26 5
August 31 24 5
September 25 13 2
October 10 2 0
November 2 0 0
December 0 0 0
Year 159 93 15

How Often Indianapolis Has Cold Temperatures

The coldest nights at Indianapolis drop down to 0 °F (-18 °C) or below. The city averages four nights a winter with temperatures that chilly.

Indianapolis typically sees 29 days annually when the thermometer doesn't rise above 32 °F (0 °C). Frosty days can happen anytime from fall until late winter.

Days per month on average in Indianapolis when the minimum temperature drops to 10, 20, or 32 °F or below
  10 °F
-12 °C
20 °F
-8 °C
32 °F
0 °C
January 7 13 25
February 4 9 22
March 0 3 15
April 0 0 4
May 0 0 0
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 0 2
November 0 2 12
December 4 10 23
Year 14 36 104
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information. 1981-2010 U.S. Climate Normals. (Data Access. FTP.)

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