September weather forecast
Indianapolis, IN

The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape
The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape

Weather in September

The first month of the autumn, September, is still a warm month in Indianapolis, Indiana, with an average temperature ranging between min 58.3°F (14.6°C) and max 75.9°F (24.4°C).

Temperature

In Indianapolis, the average high-temperature in September is almost the same as in August - a still moderately hot 75.9°F (24.4°C). In Indianapolis, the average low-temperature is 58.3°F (14.6°C).

Humidity

The average relative humidity in September in Indianapolis is 76%.

Rainfall

In Indianapolis, Indiana, it is raining for 12.2 days, with typically 1.46" (37mm) of accumulated precipitation. Throughout the year, in Indianapolis, there are 146.4 rainfall days, and 21.14" (537mm) of precipitation is accumulated.

Snowfall

In Indianapolis, snow does not fall in May through October.

Daylight

The average length of the day in September in Indianapolis is 12h and 26min.
On the first day of September, sunrise is at 7:12 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 7:28 pm EDT.

Sunshine

In September, the average sunshine is 8.4h.

UV index

In Indianapolis, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Indianapolis?

The average relative humidity in September in Indianapolis is 76%.

How many days does it rain in September in Indianapolis?

In Indianapolis, during September, the rain falls for 12.2 days and regularly aggregates up to 1.46" (37mm) of precipitation.

When it does not snow in Indianapolis?

May through October are months without snowfall in Indianapolis, Indiana.

What is the average length of the day in September in Indianapolis?

In Indianapolis, the average day length in September is 12h and 26min.

When are sunrise and sunset in September in Indianapolis?

On the first day of September in Indianapolis, sunrise is at 7:12 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 7:28 pm EDT.

How long on average sun shines in September in Indianapolis?

In September, the average sunshine duration in Indianapolis, Indiana, is 8.4h.

How high is the UV index in September in Indianapolis?

In September, the average daily maximum UV index in Indianapolis, Indiana, is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Indianapolis, IN

Average temperature in September - Indianapolis, IN
  • Average high temperature in September: 75.9°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 58.3°F

The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).

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Average pressure in September
Indianapolis, IN

Average pressure in September - Indianapolis, IN
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Indianapolis, IN

Average wind speed in September - Indianapolis, IN
  • Average wind speed in September: 6.5mph

The windiest months (with the highest average wind speed) are January and February (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

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Average humidity in September
Indianapolis, IN

Average humidity in September - Indianapolis, IN
  • Average humidity in September: 76%

The month with the highest relative humidity is December (82%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in September
Indianapolis, IN

Average rainfall in September - Indianapolis, IN
  • Average rainfall in September: 1.46"

The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is February (1.22").

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Average rainfall days in September
Indianapolis, IN

Average rainfall days in September - Indianapolis, IN
  • Average rainfall days in September: 12.2 days

The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is February (6.8 days).

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Average snowfall in September
Indianapolis, IN

Average snowfall in September - Indianapolis, IN
  • Average snowfall in September: 0"

The month with the highest snowfall is December (2.28").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Indianapolis, IN

Average snowfall days in September - Indianapolis, IN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Indianapolis, IN

Average daylight in September / Average sunshine in September - Indianapolis, IN
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 56min).
The month with the shortest days is December (Average daylight: 9h and 25min).

  • Average sunshine in September: 8h and 24min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in September
Indianapolis, IN

Average sunshine days in September - Indianapolis, IN
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is May (11.1 days).

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Average UV index in September
Indianapolis, IN

Average UV index in September - Indianapolis, IN
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average cloud cover in September
Indianapolis, IN

Average cloud cover in September - Indianapolis, IN
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in September
Indianapolis, IN

Average visibility in September - Indianapolis, IN
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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