Marion County (Indianapolis)
September
Weather in Marion County, Indiana for September 2026
Your guide to Marion County weather in September - trends and predictions
So far, September 2026 in Marion County shows a warmer trend than usual by 3 °F.
Expect cooler weather in the next days in Marion County with the forecast suggesting a temperature of 25.9 °F, lower than the historical average.
In general, the average temperature in Marion County at the beginning of September is 29.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.1 °F by the end of September.
Marion County 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
Marion County Weather September
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Temperatures trend during September in Marion County
See the weather trend as well as the moving average line
September weather in Marion County 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 |  Mist | 29° /16° | 1.5 mm | 6 | |
| Sept. 11 | Mist | 30° /16° | 0.3 mm | 6 | |
| Sept. 12 |  Light rain | 27° /17° | 42.6 mm | 5 | |
| Sept. 13 | Mist | 26° /15° | 0.2 mm | 6 | |
| Sept. 14 | Partly cloudy | 28° /16° | 3.1 mm | 7 | |
| Sept. 15 | Sunny | 31° /16° | 0.1 mm | 7 | |
| Sept. 16 | Light rain shower | 28° /22° | 6.7 mm | 3.4 | |
| Sept. 17 |  Overcast | 31° /23° | 2.1 mm | 6.4 | |
| Sept. 18 | Sunny | 26° /21° | 0.5 mm | 5.3 | |
| Sept. 19 | Sunny | 31° /20° | 1.9 mm | 6 | |
| Sept. 20 | Sunny | 32° /22° | 0.2 mm | 8 | |
| Sept. 21 | Overcast | 31° /25° | 4 mm | 8 | |
| Sept. 22 | Overcast | 28° /20° | 2.8 mm | 7 | |
| Sept. 23 | Overcast | 28° /19° | 0 mm | 7 | |
| Sept. 24 | Light rain shower | 25° /20° | 23.7 mm | 6 | |
| Sept. 25 | Light rain shower | 22° /17° | 19.6 mm | 5 | |
| Sept. 26 | Sunny | 22° /16° | 0.6 mm | 6 | |
| Sept. 27 | Overcast | 16° /12° | 0 mm | 4 | |
| Sept. 28 | Sunny | 17° /9° | 0 mm | 5 | |
| Sept. 29 | Mist | 26° /16° | 3.9 mm | 6 | |
| Sept. 30 | Mist | 27° /15° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Marion County 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 Marion County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Marion County in September - FAQ
What are the expected maximum and minimum temperatures in Marion County 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 Marion County during September?
Significant rainfall exceeding 131 mm is expected in Marion County during September, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Marion County during September?
The average wind speed in Marion County during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Marion County
Explore the daily rainfall trends and prepare for Marion Countys September weather 💧
Typically, Marion County has 6 rainy days in September with a total of 131 mm of rainfall.
UV exposure in Marion County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Marion County?Get accurate weather forecasts for Marion County, located at latitude 39.768 and longitude -86.158. Stay updated with localized weather information tailored for Marion County.
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