January Weather in Indianapolis, United States

Last updated: June 24, 2025

In January, the average temperature in Indianapolis, United States hovers around -1°C (30°F). Expect a chilly range with minimums plunging to -29°C (-19°F) and maximums reaching up to 18°C (64°F). The month brings about 82 mm (3.2 in) of precipitation over approximately 8 days, accompanied by a high average humidity of 87%. Stay warm and prepared for the dampness!

January Temperature in Indianapolis

In January in Indianapolis, the average temperature is -1°C (30°F), with a maximum that can reach 18°C (64°F) and a minimum that can drop as low as -29°C (-19°F). Travelers should be prepared for a wide range of temperatures and dress in layers for comfort during their visit.

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

The chart illustrates January 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, January typically has an average temperature of -1°C (30°F), with highs reaching up to 18°C (64°F) and lows dropping to around -29°C (-19°F).

Data source: Temperature data for Indianapolis generated using information from the Copernicus Climate Change Service.

January Precipitation in Indianapolis

In Indianapolis in January, the total precipitation amount reached 82 mm (3.2 in) over the course of 8 days.

January Precipitation Trends in Indianapolis

The chart displays monthly precipitation patterns in Indianapolis, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Indianapolis, January typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Indianapolis

In Indianapolis in January, humidity is 87%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that penetrates through layers of clothing, making travel uncomfortable as the dampness clings to your skin, intensifying the cold and causing every gust of wind to feel even more frigid.

January Average Humidity in Indianapolis

This chart illustrates the average monthly humidity levels in Indianapolis, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Indianapolis is approximately 87%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Indianapolis

In Indianapolis in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Indianapolis, you can check the information here.

Maximum UV Index Levels in Indianapolis for January

The chart shows the monthly maximum UV Index (UVI) for Indianapolis in January, 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 January, the maximum UV index in Indianapolis typically reaches 3, which falls under the moderate exposure category.

Data source: Indianapolis January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	82 mm (3.2 inches)	87%	moderate
February Weather	1°C (34°F)	93 mm (3.7 inches)	85%	moderate
March Weather	6°C (43°F)	127 mm (5.0 inches)	86%	high
April Weather	11°C (52°F)	94 mm (3.7 inches)	84%	very high
May Weather	18°C (65°F)	132 mm (5.2 inches)	79%	very high
June Weather	23°C (74°F)	107 mm (4.2 inches)	82%	extreme
July Weather	25°C (77°F)	108 mm (4.2 inches)	79%	very high
August Weather	23°C (74°F)	101 mm (4.0 inches)	70%	very high
September Weather	21°C (70°F)	80 mm (3.2 inches)	69%	very high
October Weather	14°C (58°F)	103 mm (4.0 inches)	76%	high
November Weather	5°C (42°F)	93 mm (3.7 inches)	88%	moderate
December Weather	2°C (36°F)	80 mm (3.2 inches)	87%	moderate