August 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 August

The last month of the summer, August, is another warm month in Indianapolis, Indiana, with an average temperature varying between 81.1°F (27.3°C) and 64°F (17.8°C).

Temperature

In Indianapolis, the average high-temperature in August is essentially the same as in July - a still warm 81.1°F (27.3°C). In August, in Indianapolis, the average low-temperature is 64°F (17.8°C).

Heat index

In August, the average heat index is estimated at a tropical 86.4°F (30.2°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, metabolic differences, pregnancy, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in August in Indianapolis is 78%.

Rainfall

In Indianapolis, during August, the rain falls for 14.6 days and regularly aggregates up to 1.65" (42mm) of precipitation. In Indianapolis, during the entire year, the rain falls for 146.4 days and collects up to 21.14" (537mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In August, the average length of the day is 13h and 41min.
On the first day of August in Indianapolis, Indiana, sunrise is at 6:43 am and sunset at 8:58 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 8:17 pm EDT.

Sunshine

The average sunshine in August in Indianapolis, Indiana, is 9.6h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in Indianapolis. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in August in Indianapolis?

In Indianapolis, Indiana, in August, the average high-temperature is 81.1°F (27.3°C), and the average low-temperature is 64°F (17.8°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in August is estimated at 86.4°F (30.2°C).

What is the average humidity in August in Indianapolis?

The average relative humidity in August in Indianapolis is 78%.

How many days does it rain in August in Indianapolis?

In August, the rain falls for 14.6 days. Throughout August, 1.65" (42mm) of precipitation is accumulated.

When it does not snow in Indianapolis?

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

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

The average day length in August is 13h and 41min.

When is the sunrise / sunset in August in Indianapolis?

On the first day of August in Indianapolis, sunrise is at 6:43 am and sunset at 8:58 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 8:17 pm EDT.

How long on average sun shines in August in Indianapolis?

The average sunshine duration in August in Indianapolis, Indiana, is 9.6h.

What is the month with the highest UV index in Indianapolis?

The months with the highest UV index are May through August, with an average maximum UV index of 6.

How high is the UV index in August in Indianapolis?

In August, the average daily maximum UV index in Indianapolis, Indiana, is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Indianapolis, IN

Average temperature in August - Indianapolis, IN
  • Average high temperature in August: 81.1°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 August: 64°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 August
Indianapolis, IN

Average pressure in August - Indianapolis, IN
  • Average pressure in August: 29.98"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 August
Indianapolis, IN

Average wind speed in August - Indianapolis, IN
  • Average wind speed in August: 5.7mph

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 August
Indianapolis, IN

Average humidity in August - Indianapolis, IN
  • Average humidity in August: 78%

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 August
Indianapolis, IN

Average rainfall in August - Indianapolis, IN
  • Average rainfall in August: 1.65"

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 August
Indianapolis, IN

Average rainfall days in August - Indianapolis, IN
  • Average rainfall days in August: 14.6 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 August
Indianapolis, IN

Average snowfall in August - Indianapolis, IN
  • Average snowfall in August: 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 August
Indianapolis, IN

Average snowfall days in August - Indianapolis, IN
  • Average snowfall days in August: 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 August /
Average sunshine in August
Indianapolis, IN

Average daylight in August / Average sunshine in August - Indianapolis, IN
  • Average daylight in August: 13h and 41min

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 August: 9h and 36min

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 August
Indianapolis, IN

Average sunshine days in August - Indianapolis, IN
  • Average sunshine days in August: 13.5 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 August
Indianapolis, IN

Average UV index in August - Indianapolis, IN
  • Average UV index in August: 6

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 August
Indianapolis, IN

Average cloud cover in August - Indianapolis, IN
  • Average cloud cover in August: 29

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 August
Indianapolis, IN

Average visibility in August - Indianapolis, IN
  • Average visibility in August: 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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