July Weather in Joliet, United States

Last updated: June 24, 2025

In Joliet, United States, the average temperature in July is a pleasant 22°C (72°F). However, temperatures can fluctuate, with minimums plunging to 6°C (43°F) and soaring to a sweltering 39°C (102°F). Visitors can expect about 32 mm (1.3 in) of precipitation spread over 7 days, accompanied by an average humidity level of 81%.

July Temperature in Joliet

In July in Joliet, the average temperature is 22°C (72°F). Maximum temperatures can reach 39°C (102°F), while minimums can drop as low as 6°C (43°F). Be sure to pack accordingly to enjoy the diverse climate during your travels!

July Weather in Joliet: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Joliet, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Joliet, July typically has an average temperature of 22°C (72°F), with highs reaching up to 39°C (102°F) and lows dropping to around 6°C (43°F).

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

July Precipitation in Joliet

In Joliet in July, the precipitation amount is 32 mm (1.3 in) over the course of 7 days.

July Precipitation Trends in Joliet

The chart displays monthly precipitation patterns in Joliet, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Joliet, July typically receives around 32 mm (1.3 inches) of precipitation spread over approximately 7 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

July Humidity in Joliet

In Joliet in July, humidity is 81%. With an average temperature of 22°C (72°F), this humidity feels like a warm, enveloping blanket, making traveling feel both lush and a bit stifling, as the air clings to your skin and every step is accompanied by a gentle sheen of moisture.

July Average Humidity in Joliet

This chart illustrates the average monthly humidity levels in Joliet, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Joliet is approximately 81%, offering insight into how humid the weather typically is during this month.

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

July UV Index in Joliet

In Joliet in July, 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 Joliet.

Maximum UV Index Levels in Joliet for July

The chart shows the monthly maximum UV Index (UVI) for Joliet in July, 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 July, the maximum UV index in Joliet typically reaches 10, which falls under the very high exposure category.

Data source: Joliet July 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 July Weather in Joliet Compares to Other Months

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

This table compares monthly weather conditions in Joliet, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	21 mm (0.8 inches)	85%	moderate
February Weather	-7°C (20°F)	46 mm (1.8 inches)	85%	moderate
March Weather	2°C (35°F)	44 mm (1.7 inches)	79%	high
April Weather	5°C (42°F)	76 mm (3.0 inches)	74%	very high
May Weather	12°C (53°F)	82 mm (3.2 inches)	76%	very high
June Weather	18°C (64°F)	76 mm (3.0 inches)	79%	extreme
July Weather	22°C (72°F)	32 mm (1.3 inches)	81%	very high
August Weather	21°C (69°F)	25 mm (1.0 inches)	80%	very high
September Weather	15°C (60°F)	57 mm (2.2 inches)	76%	very high
October Weather	6°C (43°F)	57 mm (2.2 inches)	74%	moderate
November Weather	1°C (35°F)	34 mm (1.3 inches)	81%	moderate
December Weather	-3°C (28°F)	30 mm (1.2 inches)	87%	low