Are you considering a trip to Indianapolis in September? Well, the weather is usually on your side with an average maximum temperature of +77°F and about 8 sunny days. Just keep in mind that there may be some rain, with an average of 10 rainy days and 69 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flightsin one click on Avionero.
Average weather
☀️
+77°F
Avg. max. temperature
+32°F
Min.
+99°F
Max.
69 mm
Total precipitation
72%
Avg. humidity
2 m/s
Avg. wind
8 ☀️
Sunny Days
10 ⛅️
Cloudy
10 🌦
Rainy
Our opinion: Indianapolis has good weather in September.
Average temperature in Indianapolis in September
Here are the expected maximum, average and minimum temperatures in Indianapolis for September based on the historical data.
Last Year
Historical Data
The temperature in September is +79°F on average, with a range between a maximum of +90°F during the day and a minimum of +50°F at night.
The average maximum temperature goes down 5% by the end of the month, compared with the beginning of the month, from +84°F to +82°F.
Is Indianapolis warm or cold in September?
Indianapolis is typically warm in September.
Maximum temperatures go down compared to the previous month from +84°F to +77°F. The minimum temperature also goes down from +66°F to +59°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Indianapolis:
Climate in Indianapolis in September
Indianapolis weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+84°F
+77°F
+66°F
Min. temperature
+45°F
+32°F
+23°F
Max. temperature
+99°F
+99°F
+91°F
Rainfall
79 mm
69 mm
81 mm
Wind
2 m/s
2 m/s
3 m/s
Humidity
74%
72%
72%
Air pressure
1015 HPa
1016 HPa
1017 HPa
Sunny days
6
8
8
Cloudy days
9
10
11
Rainy days
13
10
12
Snowy days
0
0
0
September weather is still as good as in August.It’s getting colder in September. From +84°F in the day, the average maximum temperature lowers to +77°F.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 79 mm to 69 mm.It feels drier, as humidity decreases from 74% to 72%.The average wind speed doesn’t change much during September, staying around 2 m/s.The good news is there are likely to be more sunny days in September, from 6 to 8.
October brings much the same weather, it remains good.
Wind speed in Indianapolis in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Indianapolis is gradually increasing during September, going from 2 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Indianapolis based on historical data.
Last Year
Historical Data
A chance of rain on a typical day in September stands at 27%, leading to total precipitation of around 36 mm. The maximum amount of rainfall per day is around 14 mm, which is considered light rain.On average, there are about 8 rainy days during September, so prepare to bring an umbrella.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Indianapolis wettest month is May, where a typical day has a 52% chance of precipitation and 115 mm of rainfall per day. January, on the other hand, is the driest month with a mere 16% chance of precipitation and 45 mm of rainfall per day.
How was the weather last September in Indianapolis?
This is the weather in Indianapolis in September 2023:
1 September
☀️
+83°F
2 September
☀️
+89°F
3 September
☁️
+89°F
4 September
☀️
+90°F
5 September
☁️
+89°F
6 September
🌧️
+84°F
7 September
☁️
+79°F
8 September
☁️
+74°F
9 September
☁️
+75°F
10 September
☁️
+79°F
11 September
☀️
+82°F
12 September
🌧️
+76°F
13 September
☀️
+75°F
14 September
☀️
+76°F
15 September
☀️
+77°F
16 September
☀️
+73°F
17 September
☁️
+72°F
18 September
☀️
+72°F
19 September
☁️
+78°F
20 September
☁️
+82°F
21 September
☁️
+81°F
22 September
☁️
+83°F
23 September
☀️
+80°F
24 September
☀️
+82°F
25 September
☁️
+83°F
26 September
☁️
+80°F
27 September
🌧️
+75°F
28 September
🌫️
+74°F
29 September
☁️
+77°F
30 September
☀️
+83°F
In September 2023 Indianapolis had 12 sunny days, 14 cloudy days, and 3 rainy days. The average maximum temperature was +79°F, with an absolute maximum of +90°F and a minimum of +72°F. The average humidity was 74%, with a maximum of 100% and a minimum of 33%. The average wind speed was 3 m/s, with a maximum of 8 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Indianapolis climate has changed over the last 43 years.
The climate in Indianapolis in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1979 (+59°F) and the highest in 2012 (+67°F). The driest year was 1999 with only 656 mm of rainfall, and the wettest year was 2019 with 1833 mm.
FAQ
Frequently asked questions about the weather in Indianapolis in September:
Is September a good time to visit Indianapolis?
September is a really good time to go to Indianapolis. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Indianapolis.
Can you sunbathe in Indianapolis in September?
September is warm in Indianapolis. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Indianapolis rainy in September?
Indianapolis is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Indianapolis in September?
Usually, it’s not very sunny in Indianapolis in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Indianapolis, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.