Indianapolis
Indiana, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Indianapolis, IN

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The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape, and a perfect blue night sky
The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape, and a perfect blue night sky
September is a great time to visit Indianapolis at the beginning of the autumn with mild conditions. The average temperatures are in the comfortable range of 55.9°F (13.3°C) to 78.1°F (25.6°C) with a decrease in humidity compared to the summer.
The daylight lasts for 12 hours with ample sunshine close to 8 hours and a reduction in thunderstorm activity. Cool breezes blow during the evenings, and the rainfall limits to 8 days in the month, registering around 3.1" (78.7mm).
September is a lovely time in Indianapolis with lesser crowds at the end of the summer vacations and moderate weather.
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  • The average high temperature in September: 77.6°F

The warmest month (with the highest average high temperature) is July (85°F).
The month with the lowest average high temperature is January (35.6°F).

  • The average low temperature in September: 56.2°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

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  • The average humidity in September: 74.4%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is April (65.6%).

  • The average rainfall in September: 3.1"

The wettest month (with the highest rainfall) is May (5.1").
The driest month (with the lowest rainfall) is February (2.3").

  • The average rainfall days in September: 8.1 days

The month with the highest number of rainy days is May (13.1 days).
The month with the lowest number of rainy days is September (8.1 days).

  • The average snowfall in September: 0"

The month with the highest snowfall is January (8.6").
Months with the lowest snowfall are May, June, July, August and September (0").

  • The average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.5 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

  • The average daylight in September: 12h

Months with the longest days are June and July (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9h).

  • The average sunshine in September: 7.8h

The month with most sunshine is June (Average sunshine: 9.6h).
The month with least sunshine is December (Average sunshine: 3.3h).

  • The average UV index in September: 6

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).

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