August weather forecast and climate
Indianapolis, IN

The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape
The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape
August, the last month of the summer, in Indianapolis, is another warm month, with average temperature fluctuating between 64°F (17.8°C) and 81.1°F (27.3°C).

Temperature

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

Heat index

In August, the average heat index is appraised at a tropical 86.4°F (30.2°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the 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 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like clothing, differences in body mass, height, and shape, wind, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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

In August, the average relative humidity in Indianapolis, Indiana, is 78%.

Rainfall

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

Daylight

In Indianapolis, the average length of the day in August is 13.7h.

Sunshine

In Indianapolis, the average sunshine is 9.6h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. 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.

What is the temperature in August in Indianapolis?

In August, in Indianapolis, Indiana, the average high-temperature is 81.1°F (27.3°C), and the average low-temperature is 64°F (17.8°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), that calculates temperature value influenced by the moisture in the air, is calculated to 86.4°F (30.2°C).

What is the average humidity in August in Indianapolis?

In Indianapolis, the average relative humidity in August is 78%.

How many days does it rain in August in Indianapolis?

In Indianapolis, Indiana, in August, during 14.6 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

When it does not snow in Indianapolis?

May through October are months without snowfall in Indianapolis.

How many hours of daylight does Indianapolis have in August?

The average length of the day in August in Indianapolis is 13.7h.

How long on average sun shines in August in Indianapolis?

The average sunshine in August is 9.6h.

What are the months with the highest UV index in Indianapolis?

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

What is the UV index reading in August in Indianapolis?

In August, the average daily maximum UV index in Indianapolis is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unprotected exposure to the UV radiation.
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).

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

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

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).

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%).

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").

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).

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

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

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).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in August / Average sunshine in August - Indianapolis, IN
  • Average daylight in August: 13.7h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in August: 9.6h

The month with the most sunshine is July (Average sunshine: 10.3h).
The month with the least sunshine is January (Average sunshine: 4.1h).

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).

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

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

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).

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

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