Temperatures in September
It's warm in September in Indiana with an average temperature of 24°C. Temperatures this month range from a low of 19°C to a high of 27°C. At night, you can expect temperatures between 11°C and 17°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Indiana in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Indiana with warm temperatures, averaging around 26°C during the day and nights close to 17°C. Plenty of days with a chance of precipitation.
Since temperatures can differ between day and night, it’s a good idea to dress in layers.
Mid-September
By mid-September, the average daytime temperature drops to around 25°C, with nights close to 14°C. There might be a few showers during this period, but plenty of dry days with sunshine too.
End of September
By the end of September, the average daytime temperature in Indiana will be around 23°C, with nights close to 12°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
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Precipitation in September
In September, there is an average of 161 mm of precipitation, spread over 10 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
The average precipitation chance is 34% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Indiana. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Indiana in September |
London | ||
|---|---|---|---|
 Average Temperature |
24°C | 20°C | |
 High Temp |
27°C | 22°C | |
| Low Temp |
19°C | 17°C | |
 Total Precipitation |
161 mm | 44 mm | |
| Rainy Days |
10 days | 8 days | |
August
UV index
The UV index is a maximum of 6 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is September a good time to visit Indiana?
After some sun? Then September isn’t the best time to be in Indiana. The temperature is pleasant, but there’s too much chance of rain this month.
Temperature records for Indiana in September
With 32°C, Indiana hit the highest temperature in the last 10 years in September 2015. The lowest daytime temperature in this month was 12°C in 2023. The extreme night temperatures ranged from a low of 1°C to a high of 22°C.
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Daily Temperature in September in Indiana
This chart shows the average daily temperatures, both day and night, for each day in September in Indiana, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Indiana
The chart below shows the average daily precipitation in September for Indiana, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 10 days of rain in Indiana.
Daily UV Index in September in Indiana
This chart shows the average daily UV index in September in Indiana, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Indiana Over the Years
This chart shows the average temperature in September in Indiana, measured in degrees Celsius, over the past years.
Total Precipitation in September in Indiana Over the Years
This chart shows the average precipitation in September in Indiana, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Indiana
Click on a specific day in September for detailed info on the typical weather on that day in Indiana. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Indiana
Have you been to Indiana in September?
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Average Weather in Indiana by Month
Click on a month below to see detailed weather info for Indiana. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
