Indianapolis
September
Weather in Indianapolis for September 2025
Your guide to Indianapolis weather in September - trends and predictions
In general, the average temperature in Indianapolis at the beginning of September is 29.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.6 °F by the end of September.
Indianapolis sees moderate rainfall in September, averaging 8 rainy days.
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22
Dry days
8
Rainy days
0
Snow days
28°/14°
Temperatures
15 km/h
Avg max wind
62 %
Avg humidity
Indianapolis in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  30° | 2  30° | 3  30° | 4  32° | 5  33° | 6  30° | 7  22° |
| 8 23° | 9 28° | 10 30° | 11 32° | 12  27° | 13 26° | 14 29° |
| 15 30° | 16 30° | 17  26° | 18 27° | 19 25° | 20 29° | 21 31° |
| 22 28° | 23 24° | 24 24° | 25 26° | 26 25° | 27 25° | 28 22° |
| 29 24° | 30 26° |
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Temperatures trend during September in Indianapolis
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 30° /14° | 0 mm | 8 | |
| Sept. 2 | Mist | 30° /14° | 0 mm | 8 | |
| Sept. 3 | Cloudy | 30° /16° | 0 mm | 7 | |
| Sept. 4 | Partly cloudy | 32° /17° | 0 mm | 8 | |
| Sept. 5 | Thundery outbreaks possible | 33° /20° | 0.2 mm | 7 | |
| Sept. 6 | Light rain shower | 30° /18° | 2.4 mm | 7 | |
| Sept. 7 | Overcast | 22° /13° | 0 mm | 6 | |
| Sept. 8 | Overcast | 23° /12° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 28° /13° | 0 mm | 7 | |
| Sept. 10 | Mist | 30° /14° | 0 mm | 7 | |
| Sept. 11 | Mist | 32° /15° | 0 mm | 8 | |
| Sept. 12 | Light rain | 27° /17° | 0.7 mm | 6 | |
| Sept. 13 | Mist | 26° /14° | 0 mm | 6 | |
| Sept. 14 | Partly cloudy | 29° /15° | 0 mm | 8 | |
| Sept. 15 | Sunny | 30° /14° | 0 mm | 8 | |
| Sept. 16 | Overcast | 30° /16° | 0 mm | 7 | |
| Sept. 17 | Moderate or heavy rain shower | 26° /13° | 4.1 mm | 6 | |
| Sept. 18 | Overcast | 27° /13° | 0 mm | 7 | |
| Sept. 19 | Overcast | 25° /14° | 0 mm | 6 | |
| Sept. 20 | Cloudy | 29° /14° | 0 mm | 7 | |
| Sept. 21 | Overcast | 31° /17° | 0 mm | 7 | |
| Sept. 22 | Cloudy | 28° /18° | 0 mm | 7 | |
| Sept. 23 | Sunny | 24° /15° | 2.2 mm | 6 | |
| Sept. 24 | Cloudy | 24° /13° | 0 mm | 6 | |
| Sept. 25 | Moderate or heavy rain shower | 26° /16° | 2.1 mm | 6 | |
| Sept. 26 | Patchy light drizzle | 25° /15° | 1.6 mm | 6 | |
| Sept. 27 | Light rain shower | 25° /16° | 6.8 mm | 5 | |
| Sept. 28 | Light rain shower | 22° /16° | 5.5 mm | 5 | |
| Sept. 29 | Mist | 24° /16° | 5.8 mm | 6 | |
| Sept. 30 | Mist | 26° /15° | 0 mm | 6 | |
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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.
Indianapolis in September - FAQ
What are the expected maximum and minimum temperatures in Indianapolis during September?
Enjoy moderate daytime temperatures of up to 28° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Indianapolis during September?
In September, Indianapolis can expect light to moderate rainfall, totaling 35.3 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Indianapolis during September?
The average wind speed in Indianapolis during September is 15 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 💧
UV exposure in Indianapolis during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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