Indiana, USA
Long term weather forecast
Long term weather forecast

September weather forecast and Climate
Indianapolis, IN

  • Average high temperature in September: 77.6°F

Warmest month (with highest average high temperature) is July (85°F).
Month with lowest average high temperature is January (35.6°F).

  • Average low temperature in September: 56.2°F

Month with highest average low temperature is July (65.8°F).
Coldest month (with lowest average low temperature) is January (20.5°F).

  • Average humidity in September: 74.4%

Month with highest relative humidity is December (78%).
Month with lowest relative humidity is April (65.6%).

  • Average rainfall in September: 3.1"

Wettest month (with highest rainfall) is May (5.1").
Driest month (with lowest rainfall) is February (2.3").

  • Average rainfall days in September: 8.1 days

Month with highest number of rainy days is May (13.1 days).
Month with lowest number of rainy days is September (8.1 days).

  • Average snowfall in September: 0"

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

  • Average snowfall days in September: 0 days

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

  • Average daylight in September: 12h

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

  • Average sunshine in September: 7.8h

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

  • Average UV index in September: 6

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