Indianapolis (IN)
September
Weather in Indianapolis, Indiana for September 2026
Your guide to Indianapolis weather in September - trends and predictions
Until now, September 2026 in Indianapolis has been significantly warmer than historical averages.
Expect cooler weather in the next days in Indianapolis with the forecast suggesting a temperature of 26.1 °F, lower than the historical average.
In general, the average temperature in Indianapolis at the beginning of September is 29.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.3 °F by the end of September.
Indianapolis experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 131 mm.
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Temperatures
Rain 🌧️
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24
Dry days
6
Rainy days
0
Snow days
27°/15°
Temperatures
14 km/h
Avg max wind
63 %
Avg humidity
Indianapolis Weather September
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Temperatures trend during September in Indianapolis
See the weather trend as well as the moving average line
September weather in Indianapolis day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /16° | 0 mm | 8 | |
| Sept. 2 | Sunny | 31° /16° | 0 mm | 8 | |
| Sept. 3 |  Cloudy | 31° /17° | 0 mm | 7 | |
| Sept. 4 | Sunny | 31° /18° | 6.1 mm | 7 | |
| Sept. 5 |  Thundery outbreaks possible | 32° /18° | 0.1 mm | 7 | |
| Sept. 6 |  Light rain shower | 28° /16° | 3.4 mm | 7 | |
| Sept. 7 | Sunny | 24° /12° | 0 mm | 6 | |
| Sept. 8 | Sunny | 26° /12° | 0 mm | 6 | |
| Sept. 9 |  Partly cloudy | 28° /14° | 0.5 mm | 7 | |
| Sept. 10 | Patchy rain possible | 27° /19° | 24 mm | 4.3 | |
| Sept. 11 |  Overcast | 25° /17° | 0 mm | 5.3 | |
| Sept. 12 | Sunny | 28° /20° | 0.4 mm | 6.7 | |
| Sept. 13 | Sunny | 31° /22° | 0 mm | 6.7 | |
| Sept. 14 | Sunny | 34° /22° | 0 mm | 8 | |
| Sept. 15 | Patchy rain possible | 30° /21° | 3.6 mm | 7 | |
| Sept. 16 | Overcast | 20° /17° | 0.2 mm | 4 | |
| Sept. 17 | Patchy rain possible | 30° /16° | 6 mm | 7 | |
| Sept. 18 | Patchy rain possible | 19° /14° | 6.8 mm | 5 | |
| Sept. 19 | Sunny | 20° /12° | 0 mm | 6 | |
| Sept. 20 | Sunny | 22° /13° | 0 mm | 6 | |
| Sept. 21 | Overcast | 24° /14° | 0 mm | 6 | |
| Sept. 22 | Sunny | 28° /17° | 0 mm | 7 | |
| Sept. 23 | Sunny | 28° /20° | 0 mm | 7 | |
| Sept. 24 | Cloudy | 23° /15° | 30 mm | 5 | |
| Sept. 25 |  Moderate or heavy rain shower | 25° /17° | 1.4 mm | 5 | |
| Sept. 26 |  Patchy light drizzle | 25° /14° | 1.1 mm | 5 | |
| Sept. 27 | Light rain shower | 26° /16° | 4.5 mm | 5 | |
| Sept. 28 | Light rain shower | 25° /16° | 3.6 mm | 6 | |
| Sept. 29 |  Mist | 26° /16° | 3.9 mm | 6 | |
| Sept. 30 | Mist | 27° /15° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Indianapolis in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Indianapolis forecast closer to your planned date for the most up-to-date weather information.
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Indianapolis in September - FAQ
What are the expected maximum and minimum temperatures in Indianapolis during September?
During September, expect a variety of temperatures with highs around 27° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Indianapolis during September?
Significant rainfall exceeding 131 mm is expected in Indianapolis during September, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Indianapolis during September?
The average wind speed in Indianapolis during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Indianapolis
Explore the daily rainfall trends and prepare for Indianapoliss September weather 💧
Typically, Indianapolis has 6 rainy days in September with a total of 131 mm of rainfall.
UV exposure in Indianapolis during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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