Marion County (Indianapolis)
September
Weather in Marion County, Indiana for September 2026
Your guide to Marion County weather in September - trends and predictions
In general, the average temperature in Marion County at the beginning of September is 27.9 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 25.3 °C by the end of September.
The climate of Marion County in September is notably wet, with an average of 13 rainy days, and a total of 131 mm of precipitation.
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Temperatures
Rain 🌧️
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17
Dry days
13
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
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September weather in Marion County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 29° /14° | 0 mm | 7 | |
| Sept. 2 |  Mist | 29° /14° | 0 mm | 7 | |
| Sept. 3 |  Cloudy | 29° /15° | 0 mm | 7 | |
| Sept. 4 |  Partly cloudy | 29° /16° | 8.2 mm | 7 | |
| Sept. 5 |  Thundery outbreaks possible | 30° /17° | 0.1 mm | 6 | |
| Sept. 6 |  Light rain shower | 27° /15° | 4.6 mm | 6 | |
| Sept. 7 |  Overcast | 22° /12° | 0 mm | 5 | |
| Sept. 8 | Sunny | 23° /11° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 27° /12° | 0 mm | 7 | |
| Sept. 10 | Mist | 29° /14° | 0 mm | 7 | |
| Sept. 11 | Mist | 30° /16° | 0 mm | 7 | |
| Sept. 12 |  Light rain | 28° /16° | 0.5 mm | 6 | |
| Sept. 13 | Mist | 26° /14° | 0 mm | 6 | |
| Sept. 14 | Partly cloudy | 30° /17° | 4.2 mm | 7 | |
| Sept. 15 | Sunny | 30° /15° | 0 mm | 7 | |
| Sept. 16 | Overcast | 30° /17° | 0 mm | 7 | |
| Sept. 17 | Sunny | 27° /14° | 2.7 mm | 6 | |
| Sept. 18 | Overcast | 27° /14° | 0 mm | 6 | |
| Sept. 19 | Overcast | 27° /15° | 0 mm | 6 | |
| Sept. 20 | Cloudy | 29° /16° | 0 mm | 6 | |
| Sept. 21 | Overcast | 29° /17° | 32.1 mm | 7 | |
| Sept. 22 | Cloudy | 28° /18° | 10.2 mm | 6 | |
| Sept. 23 | Sunny | 25° /16° | 24 mm | 6 | |
| 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 | |
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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.
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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 13 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 13 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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