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April Weather in Saint Charles, United States

Last updated: June 24, 2025

In April, the average temperature in Saint Charles, United States hovers around 8°C (46°F). Expect a range from a chilly -8°C (19°F) at its lowest to a warm 28°C (83°F) at its peak. Throughout the month, anticipate 88 mm (3.4 in) of precipitation spread over 12 days, coupled with a high average humidity of 86%.

April Temperature in Saint Charles

In April in Saint Charles, the average temperature is 8°C (46°F). The maximum can reach 28°C (83°F), and the minimum can be as low as -8°C (19°F). This range makes it essential for travelers to pack for varying conditions, ensuring they are prepared for both warm days and chilly nights.

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

The chart illustrates April 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, April typically has an average temperature of 8°C (46°F), with highs reaching up to 28°C (83°F) and lows dropping to around -8°C (19°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.

April Precipitation in Saint Charles

In Saint Charles, in April, the precipitation amount is 88 mm (3.4 in) over the course of 12 days.

April Precipitation Trends in Saint Charles

The chart displays monthly precipitation patterns in Saint Charles, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Saint Charles, April typically receives around 88 mm (3.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec5963618811512166761011126060
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Saint Charles

In Saint Charles in April humidity is 86%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay comfortable while exploring.

April Average Humidity in Saint Charles

This chart illustrates the average monthly humidity levels in Saint Charles, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Saint Charles is approximately 86%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Saint Charles

In Saint Charles in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Saint Charles.

Maximum UV Index Levels in Saint Charles for April

The chart shows the monthly maximum UV Index (UVI) for Saint Charles in April, 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 April, the maximum UV index in Saint Charles typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Saint Charles April 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 April 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 April’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 April’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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