Monthly Climate
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Best time to visit Indianapolis

September is the best time to visit Indianapolis for general sightseeing, with average highs of 25 °C and about 7 wet days. The comfortable season runs roughly September to October.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking September comfort 91/100
The least cloud September 46 % average cloud cover
The least rain February 69 mm
Warmth July 29 °C
Cooler weather January 2.6 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 September 91 25 °C 7
2 May 83 23 °C 14
3 October 82 18 °C 9
4 June 77 27 °C 12
5 August 77 28 °C 9
6 July 71 29 °C 11
7 April 71 18 °C 12
8 November 50 11 °C 9
9 March 45 11 °C 11
10 February 30 5.2 °C 8
11 January 27 2.6 °C 10
12 December 27 4.8 °C 10

When to think twice

December scores lowest with about 10 wet days and highs near 4.8 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

Month Avg high Rainfall Cloud
January 2.6 °C 79 mm 70 %
February 5.2 °C 69 mm 69 %
March 10.8 °C 97 mm 64 %
April 17.5 °C 122 mm 62 %
May 22.7 °C 124 mm 61 %
June 27.2 °C 107 mm 56 %
July 29.0 °C 94 mm 51 %
August 28.4 °C 72 mm 49 %
September 25.1 °C 74 mm 46 %
October 18.3 °C 82 mm 53 %
November 10.8 °C 87 mm 62 %
December 4.8 °C 78 mm 70 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.