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United States weather

Weather in Indianapolis, Indiana for September 2025

Your guide to Indianapolis weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Indianapolis is cooler than usual, with temperatures averaging 24 °F, this is -3.6 °F below the typical seasonal average.

  • The forecast for the upcoming days in Indianapolis predicts a temperature of 29.1 °F, which is slightly above the historical average.

  • In general, the average temperature in Indianapolis at the beginning of September is 27.9 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 24.9 °F by the end of September.

    • Rain 🌧️

  • Indianapolis experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 31.4 mm.

    • More

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Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/15°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
60 %
Avg humidity

Indianapolis Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
29°
2
Mist
29°
3
Cloudy
29°
4
Partly cloudy
29°
5
Thundery outbreaks possible
30°
6
Light rain shower
27°
7
Overcast
22°
8
Sunny
23°
9
Partly cloudy
27°
10
Mist
29°
11
Mist
30°
12
Light rain
28°
13
Cloudy
31°
14
Patchy rain possible
33°
15
Moderate rain
31°
16
Sunny
33°
17
Sunny
34°
18
Patchy rain possible
33°
19
Partly cloudy
28°
20
Sunny
27°
21
Partly cloudy
23°
22
Sunny
26°
23
Sunny
31°
24
Patchy rain possible
22°
25
Partly cloudy
27°
26
Cloudy
28°
27
Light rain shower
25°
28
Light rain shower
22°
29
Mist
24°
30
Mist
26°

Temperatures trend during September in Indianapolis

See the weather trend as well as the moving average line

September weather in Indianapolis day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 29° /14° 0 mm 7
Sept. 2 Mist
Mist
 29° /14° 0 mm 7
Sept. 3 Cloudy
Cloudy
 29° /15° 0 mm 7
Sept. 4 Partly cloudy
Partly cloudy
 29° /16° 8.2 mm 7
Sept. 5 Thundery outbreaks possible
Thundery outbreaks possible
 30° /17° 0.1 mm 6
Sept. 6 Light rain shower
Light rain shower
 27° /15° 4.6 mm 6
Sept. 7 Overcast
Overcast
 22° /12° 0 mm 5
Sept. 8 Sunny
Sunny
 23° /11° 0 mm 6
Sept. 9 Partly cloudy
Partly cloudy
 27° /12° 0 mm 7
Sept. 10 Mist
Mist
 29° /14° 0 mm 7
Sept. 11 Mist
Mist
 30° /16° 0 mm 7
Sept. 12 Light rain
Light rain
 28° /16° 0.5 mm 6
Sept. 13 Cloudy
Cloudy
 31° /16° 0 mm 1.4
Sept. 14 Patchy rain possible
Patchy rain possible
 33° /18° 2.3 mm 1.5
Sept. 15 Moderate rain
Moderate rain
 31° /20° 12.9 mm 1.5
Sept. 16 Sunny
Sunny
 33° /20° 0 mm 1.5
Sept. 17 Sunny
Sunny
 34° /19° 0 mm 0
Sept. 18 Patchy rain possible
Patchy rain possible
 33° /21° 0.5 mm 6
Sept. 19 Partly cloudy
Partly cloudy
 28° /19° 0.1 mm 6
Sept. 20 Sunny
Sunny
 27° /17° 0 mm 6
Sept. 21 Partly cloudy
Partly cloudy
 23° /16° 0 mm 5
Sept. 22 Sunny
Sunny
 26° /15° 0 mm 5
Sept. 23 Sunny
Sunny
 31° /16° 0 mm 6
Sept. 24 Patchy rain possible
Patchy rain possible
 22° /16° 0.8 mm 4
Sept. 25 Partly cloudy
Partly cloudy
 27° /15° 0 mm 6
Sept. 26 Cloudy
Cloudy
 28° /18° 0 mm 5
Sept. 27 Light rain shower
Light rain shower
 25° /16° 6.8 mm 5
Sept. 28 Light rain shower
Light rain shower
 22° /16° 5.5 mm 5
Sept. 29 Mist
Mist
 24° /16° 5.8 mm 6
Sept. 30 Mist
Mist
 26° /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.
Change Month
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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?
In September, Indianapolis can expect light to moderate rainfall, totaling 31.4 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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Location coordinates Where is Indianapolis?

Get accurate weather forecasts for Indianapolis, located at latitude 39.768 and longitude -86.158. Stay updated with localized weather information tailored for Indianapolis.

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