Indianapolis IN Average Temperatures 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 1991 to 2020 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, 1991 to 2020
High °F	Low °F		High °C	Low °C
36	21	January	2	-6
41	24	February	5	-4
52	33	March	11	1
64	43	April	18	6
73	54	May	23	12
82	63	June	28	17
85	66	July	30	19
84	65	August	29	18
78	57	September	26	14
66	46	October	19	8
52	35	November	11	2
40	26	December	5	-3
63	45	Year	17	7

Days of Hot Weather in Indianapolis

Indianapolis typically gets 20 days of high temperatures spread out across the summer. On those days, highs peak in the 90s Fahrenheit. But the thermometer doesn't normally 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	3	0	0
April	10	2	0
May	21	10	0
June	29	20	3
July	31	26	7
August	31	25	6
September	25	14	3
October	11	3	0
November	2	0	0
December	0	0	0
Year	163	101	20

How Often Indianapolis Has Cold Temperatures

The coldest nights at Indianapolis drop down to 0 °F (-18 °C) or below. The city averages three 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	14	26
February	3	9	22
March	1	4	16
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	13
December	3	8	23
Year	13	37	106

Indianapolis Temperatures: Averages by Month

Days of Hot Weather in Indianapolis

How Often Indianapolis Has Cold Temperatures

References

More on Weather in Indiana