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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.
- 2525°C max day temperature
- 8 hours of sunshine per day
- 88 days with some rainfall
- 1313°C min night temperature
- 1212 hours of daylight per day
- LLow heat & humidity
- 7575 mm of monthly rainfall
- 66 (High) UV index
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Recommended for Indiana
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)
More about the USA
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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