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July Weather in Saint Charles, United States

Last updated: June 24, 2025

In July, the average temperature in Saint Charles, United States hovers around 26°C (80°F). Expect a comfortable minimum of 15°C (60°F), while temperatures can peak at a sizzling 38°C (101°F). During this month, you can anticipate 95 mm (3.7 in) of precipitation spread across 11 days. With an average humidity of 81%, prepare for a tropical vibe that keeps the air warm and inviting!

July Temperature in Saint Charles

In July in Saint Charles, the average temperature is 26°C (80°F), with maximums reaching 38°C (101°F) and minimums dropping as low as 15°C (60°F). This makes it a great time to explore the area, so pack accordingly for warm days and 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 26°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec323547556777807672594439
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 total precipitation amount is 95 mm (3.7 in) spread over 11 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 95 mm (3.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec74791301241439395135561057156
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 81%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket that clings to the skin, making outdoor activities feel more strenuous and requiring frequent breaks to stay refreshed and 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.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101110109643
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 Weather0°C (32°F)74 mm (2.9 inches)82%moderate
February Weather2°C (35°F)79 mm (3.1 inches)80%moderate
March Weather8°C (47°F)130 mm (5.1 inches)80%high
April Weather13°C (55°F)124 mm (4.9 inches)80%very high
May Weather19°C (67°F)143 mm (5.6 inches)82%very high
June Weather25°C (77°F)93 mm (3.7 inches)83%extreme
July Weather26°C (80°F)95 mm (3.7 inches)81%very high
August Weather25°C (76°F)135 mm (5.3 inches)80%very high
September Weather22°C (72°F)56 mm (2.2 inches)76%very high
October Weather15°C (59°F)105 mm (4.1 inches)76%high
November Weather7°C (44°F)71 mm (2.8 inches)85%moderate
December Weather4°C (39°F)55 mm (2.2 inches)86%moderate

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