Marion County (Indianapolis)
September
Weather in Marion County for September 2025
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 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.
Marion County 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
Marion County 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 Marion County
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 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.
Marion County in September - FAQ
What are the expected maximum and minimum temperatures in Marion County 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 Marion County during September?
In September, Marion County 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 Marion County during September?
The average wind speed in Marion County during September is 15 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 💧
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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