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August Weather in Indianapolis, United States

Last updated: June 24, 2025

In Indianapolis, United States, the average temperature in August hovers around 23°C (74°F), offering a pleasant climate. Expect minimums of 11°C (53°F) and highs reaching up to 34°C (93°F). During this month, anticipate 101 mm (4.0 in) of precipitation spread over approximately 12 days, contributing to an average humidity of 70%. Enjoy the balanced weather as you explore this vibrant destination!

August Temperature in Indianapolis

In August in Indianapolis, the average temperature is 23°C (74°F). The maximum can reach 34°C (93°F), and the minimum can be as low as 11°C (53°F). This makes it an ideal time for travelers to enjoy a pleasant climate while exploring the attractions of Indianapolis.

August Weather in Indianapolis: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Indianapolis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Indianapolis, August typically has an average temperature of 23°C (74°F), with highs reaching up to 34°C (93°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec303443526474777470584236
Data source: Temperature data for Indianapolis generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Indianapolis

In Indianapolis in August, the precipitation amount is 101 mm (4.0 in) spread over 12 days.

August Precipitation Trends in Indianapolis

The chart displays monthly precipitation patterns in Indianapolis, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Indianapolis, August typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec829312794132107108101801039380
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Indianapolis

In Indianapolis in August humidity is 70%. With an average temperature of 23°C (74°F), this humidity feels like a warm, sticky embrace, making outdoor activities somewhat challenging but still bearable for traveling.

August Average Humidity in Indianapolis

This chart illustrates the average monthly humidity levels in Indianapolis, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Indianapolis is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Indianapolis

In Indianapolis in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Indianapolis.

Maximum UV Index Levels in Indianapolis for August

The chart shows the monthly maximum UV Index (UVI) for Indianapolis in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Indianapolis typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
Data source: Indianapolis August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in Indianapolis Compares to Other Months

Weather in Indianapolis varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Indianapolis, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Indianapolis, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)82 mm (3.2 inches)87%moderate
February Weather1°C (34°F)93 mm (3.7 inches)85%moderate
March Weather6°C (43°F)127 mm (5.0 inches)86%high
April Weather11°C (52°F)94 mm (3.7 inches)84%very high
May Weather18°C (65°F)132 mm (5.2 inches)79%very high
June Weather23°C (74°F)107 mm (4.2 inches)82%extreme
July Weather25°C (77°F)108 mm (4.2 inches)79%very high
August Weather23°C (74°F)101 mm (4.0 inches)70%very high
September Weather21°C (70°F)80 mm (3.2 inches)69%very high
October Weather14°C (58°F)103 mm (4.0 inches)76%high
November Weather5°C (42°F)93 mm (3.7 inches)88%moderate
December Weather2°C (36°F)80 mm (3.2 inches)87%moderate

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