July Weather in Saint Charles, United States

Last updated: June 24, 2025

In July, the average temperature in Saint Charles, United States hovers around 23°C (74°F). Expect a comfortable range, with minimums dipping to 11°C (53°F) and highs reaching up to 34°C (93°F). However, be prepared for some rain, as 103 mm (4.1 in) of precipitation may fall across 10 days. With an average humidity of 75%, it's wise to stay hydrated while enjoying the balmy weather!

July Temperature in Saint Charles

In July in Saint Charles, 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 Saint Charles.

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 23°C (74°F), with highs reaching up to 34°C (93°F) and lows dropping to around 11°C (53°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 103 mm (4.1 in) over a span of 10 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 103 mm (4.1 inches) of precipitation spread over approximately 10 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 75%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket wrapping around you, making it feel more sweltering than it actually is, which can be quite uncomfortable for traveling.

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 75%, 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	-8°C (18°F)	36 mm (1.4 inches)	84%	moderate
February Weather	-7°C (19°F)	48 mm (1.9 inches)	85%	moderate
March Weather	1°C (34°F)	57 mm (2.2 inches)	84%	moderate
April Weather	7°C (44°F)	86 mm (3.4 inches)	83%	very high
May Weather	15°C (59°F)	152 mm (6.0 inches)	75%	very high
June Weather	21°C (71°F)	151 mm (5.9 inches)	79%	very high
July Weather	23°C (74°F)	103 mm (4.1 inches)	75%	very high
August Weather	21°C (70°F)	126 mm (5.0 inches)	69%	very high
September Weather	18°C (64°F)	117 mm (4.6 inches)	74%	very high
October Weather	9°C (49°F)	118 mm (4.7 inches)	79%	moderate
November Weather	1°C (34°F)	52 mm (2.0 inches)	88%	moderate
December Weather	-4°C (26°F)	43 mm (1.7 inches)	82%	low