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June Weather in St. Charles, United States

Last updated: June 24, 2025

In St. Charles, United States, the average temperature in June hovers around 24°C (76°F). Expect a range from a cool 12°C (54°F) to a warm 36°C (96°F). This month sees an average precipitation of 106 mm (4.2 in) over approximately 13 days, accompanied by a humidity level of 79%.

June Temperature in St. Charles

In June in St. Charles, the average temperature is 24°C (76°F). Maximum can reach 36°C (96°F) and minimum can be as low as 12°C (54°F). This makes St. Charles an ideal destination for travelers seeking warm and pleasant weather during this time.

June Weather in St. Charles: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in St. Charles, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Charles, June typically has an average temperature of 24°C (76°F), with highs reaching up to 36°C (96°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec384248586776817873634943
Data source: Temperature data for St. 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.

June Precipitation in St. Charles

In St. Charles in June, the precipitation amount is 106 mm (4.2 in) spread over a duration of 13 days.

June Precipitation Trends in St. Charles

The chart displays monthly precipitation patterns in St. Charles, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In St. Charles, June typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec62937799118106122151911087886
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in St. Charles

In St. Charles in June, humidity is 79%. With an average temperature of 24°C (76°F), this humidity feels like a thick blanket wrapped around you, making traveling somewhat uncomfortable and sticky, as you navigate through the warmth while constantly seeking shade and hydration.

June Average Humidity in St. Charles

This chart illustrates the average monthly humidity levels in St. Charles, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in St. Charles is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in St. Charles

In St. Charles in June, 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 St. Charles.

Maximum UV Index Levels in St. Charles for June

The chart shows the monthly maximum UV Index (UVI) for St. Charles in June, 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 June, the maximum UV index in St. Charles typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: St. Charles June 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 June Weather in St. Charles Compares to Other Months

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

This table compares monthly weather conditions in St. Charles, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)62 mm (2.4 inches)84%moderate
February Weather6°C (42°F)93 mm (3.7 inches)83%moderate
March Weather9°C (48°F)77 mm (3.0 inches)83%high
April Weather14°C (58°F)99 mm (3.9 inches)81%very high
May Weather19°C (67°F)118 mm (4.6 inches)78%very high
June Weather24°C (76°F)106 mm (4.2 inches)79%very high
July Weather27°C (81°F)122 mm (4.8 inches)74%very high
August Weather26°C (79°F)151 mm (5.9 inches)72%very high
September Weather23°C (73°F)91 mm (3.6 inches)75%very high
October Weather17°C (64°F)108 mm (4.2 inches)81%high
November Weather9°C (49°F)78 mm (3.1 inches)85%moderate
December Weather6°C (43°F)86 mm (3.4 inches)84%moderate

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