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May Weather in Indianapolis, United States

Last updated: June 24, 2025

In May, the average temperature in Indianapolis, United States hovers around 18°C (65°F). However, be prepared for temperature fluctuations, as it can dip to a chilly -2°C (29°F) or soar to a warm 33°C (92°F). Expect 132 mm (5.2 in) of precipitation over about 14 days, contributing to an average humidity of 79%—perfect for a cozy, rainy atmosphere!

May Temperature in Indianapolis

In May in Indianapolis, the average temperature is 18°C (65°F). Maximums can reach 33°C (92°F), while minimums can drop as low as -2°C (29°F). This makes it essential to pack layers to accommodate both warm and chilly conditions during your travels.

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

The chart illustrates May 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, May typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (92°F) and lows dropping to around -2°C (29°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.

May Precipitation in Indianapolis

In Indianapolis in May, the precipitation amount is 132 mm (5.2 in) over a span of 14 days.

May Precipitation Trends in Indianapolis

The chart displays monthly precipitation patterns in Indianapolis, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Indianapolis, May typically receives around 132 mm (5.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec829312794132107108101801039380
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Indianapolis

In Indianapolis in May, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

May Average Humidity in Indianapolis

This chart illustrates the average monthly humidity levels in Indianapolis, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Indianapolis is approximately 79%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Indianapolis

In Indianapolis in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Indianapolis.

Maximum UV Index Levels in Indianapolis for May

The chart shows the monthly maximum UV Index (UVI) for Indianapolis in May, 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 May, the maximum UV index in Indianapolis typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
Data source: Indianapolis May 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 May 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 May’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 May’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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