July Weather in Saint Charles, United States

Last updated: June 24, 2025

In July, the average temperature in Saint Charles, United States is around 25°C (78°F). Visitors can expect temperatures to vary widely, with a minimum of 13°C (56°F) and a maximum reaching up to 37°C (98°F). The region experiences an average precipitation of 69 mm (2.7 in) spread over about 8 days, contributing to a humid climate with an average humidity of 81%.

July Temperature in Saint Charles

In July in Saint Charles, the average temperature is 25°C (78°F). The maximum can reach 37°C (98°F) and the minimum can be as low as 13°C (56°F). Be sure to pack light clothing for the warm days and a light jacket for cooler evenings while exploring this destination.

July Weather in Saint Charles: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Saint Charles, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Charles, July typically has an average temperature of 25°C (78°F), with highs reaching up to 37°C (98°F) and lows dropping to around 13°C (56°F).

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

July Precipitation in Saint Charles

In Saint Charles in July, the precipitation amount is 69 mm (2.7 in) that falls over a period of 8 days.

July Precipitation Trends in Saint Charles

The chart displays monthly precipitation patterns in Saint Charles, 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 Saint Charles, July typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Saint Charles

In Saint Charles in July humidity is 81%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities less comfortable and requiring frequent breaks to stay hydrated.

July Average Humidity in Saint Charles

This chart illustrates the average monthly humidity levels in Saint Charles, 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 Saint Charles 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 Saint Charles

In Saint Charles 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 Saint Charles.

Maximum UV Index Levels in Saint Charles for July

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

Data source: Saint Charles 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 Saint Charles Compares to Other Months

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

This table compares monthly weather conditions in Saint Charles, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	41 mm (1.6 inches)	78%	moderate
February Weather	-4°C (25°F)	39 mm (1.6 inches)	80%	moderate
March Weather	5°C (41°F)	85 mm (3.3 inches)	77%	high
April Weather	10°C (50°F)	69 mm (2.7 inches)	77%	very high
May Weather	17°C (63°F)	163 mm (6.4 inches)	77%	very high
June Weather	24°C (75°F)	117 mm (4.6 inches)	81%	extreme
July Weather	25°C (78°F)	69 mm (2.7 inches)	81%	very high
August Weather	24°C (75°F)	76 mm (3.0 inches)	77%	very high
September Weather	20°C (69°F)	117 mm (4.6 inches)	73%	very high
October Weather	12°C (53°F)	134 mm (5.3 inches)	75%	high
November Weather	4°C (39°F)	43 mm (1.7 inches)	85%	moderate
December Weather	0°C (32°F)	36 mm (1.4 inches)	83%	moderate