Indianapolis weather in September 2025

Expect 25°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Indianapolis in September. Check more long-term weather averages for Indianapolis in September before you book your next holiday to Indiana in 2025/2026.

  • 25°C maximum daytime temperature in September in Indianapolis25
    25°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Indianapolis8
    8 days with some rainfall
  • 13°C minimum night-time temperature in September in Indianapolis13
    13°C min night temperature
  • 12 hours of daylight per day in September in Indianapolis12
    12 hours of daylight per day
  • Low heat & humidity in September in IndianapolisL
    Low heat & humidity
  • 75 mm monthly rainfall in September in Indianapolis75
    75 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Indianapolis6
    6 (High) UV index

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The September weather guide for Indiana (Indianapolis) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Indianapolis in September?

Daytime temperatures usually reach 25°C in Indianapolis in September with low heat and humidity, falling to 13°C at night.

How sunny is it in Indianapolis in September?

There are normally 8 hours of bright sunshine each day in Indianapolis in September - that's 63% of daylight hours.

Does it rain in Indianapolis in September?

There are usually 8 days with some rain in Indianapolis in September and the average monthly rainfall is 75mm.

Indianapolis September sunrise & sunset times

Browse the sunrise and sunset times for Indianapolis in September 2025. Select a month to view Indianapolis sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:13 19:15
Monday, 15th September 2025 06:26 18:53
Tuesday, 30th September 2025 06:40 18:28

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