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July Weather in Saint Charles, United States

Last updated: June 24, 2025

In Saint Charles, United States, the average temperature in July hovers around 23°C (75°F), with a minimum of 11°C (52°F) and a scorching maximum of 36°C (97°F). Expect 66 mm (2.6 in) of precipitation spread over 9 days, contributing to an average humidity of 80%. Perfect for those who don't mind the heat and occasional rain!

July Temperature in Saint Charles

In July in Saint Charles, the average temperature is 23°C (75°F). Maximums can reach 36°C (97°F) and minimums can be as low as 11°C (52°F). This makes Saint Charles a great destination for travelers seeking warm weather, but also a good idea to pack layers for cooler evenings.

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 (75°F), with highs reaching up to 36°C (97°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec252636465969747264533831
Data source: Temperature data for Saint Charles 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.

July Precipitation in Saint Charles

In Saint Charles in July, the precipitation amount is 66 mm (2.6 in) over the course of 9 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 66 mm (2.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec5963618811512166761011126060
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in Saint Charles

In Saint Charles in July, humidity is 80%. With an average temperature of 23°C (75°F), this humidity feels like a warm, enveloping blanket, making outdoor activities a tad sticky but still manageable for those up for a leisurely exploration.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
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.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)59 mm (2.3 inches)88%low
February Weather-3°C (26°F)63 mm (2.5 inches)87%moderate
March Weather2°C (36°F)61 mm (2.4 inches)85%moderate
April Weather8°C (46°F)88 mm (3.4 inches)86%very high
May Weather15°C (59°F)115 mm (4.5 inches)80%very high
June Weather21°C (70°F)121 mm (4.8 inches)80%very high
July Weather23°C (75°F)66 mm (2.6 inches)80%very high
August Weather22°C (72°F)76 mm (3.0 inches)80%very high
September Weather18°C (65°F)101 mm (4.0 inches)80%high
October Weather11°C (53°F)112 mm (4.4 inches)84%moderate
November Weather3°C (38°F)60 mm (2.4 inches)89%moderate
December Weather0°C (32°F)60 mm (2.4 inches)86%low

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