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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 is a brisk 7°C (44°F). Be prepared for a range of temperatures, as it can dip as low as -13°C (9°F) or soar to a warm 27°C (80°F). Expect around 86 mm (3.4 in) of precipitation spread across 11 days, contributing to a high average humidity of 83%.

April Temperature in Saint Charles

In April in Saint Charles, the average temperature is 7°C (44°F), with maximums reaching 27°C (80°F) and minimums dropping as low as -13°C (9°F). It's essential to pack layers to prepare 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 7°C (44°F), with highs reaching up to 27°C (80°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec181934445970737064483425
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 86 mm (3.4 in), spread over 11 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 86 mm (3.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec364857861521511031261171195243
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 83%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making exploring outdoors somewhat uncomfortable and requiring extra layers to stay warm and dry.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%84%83%75%79%75%69%74%79%88%82%
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.
JanFebMarAprMayJunJulAugSepOctNovDec34589101098532
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-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 Weather1°C (34°F)57 mm (2.2 inches)84%moderate
April Weather7°C (44°F)86 mm (3.4 inches)83%very high
May Weather15°C (59°F)152 mm (6.0 inches)75%very high
June Weather21°C (71°F)151 mm (5.9 inches)79%very high
July Weather23°C (74°F)103 mm (4.1 inches)75%very high
August Weather21°C (70°F)126 mm (5.0 inches)69%very high
September Weather18°C (64°F)117 mm (4.6 inches)74%very high
October Weather9°C (49°F)118 mm (4.7 inches)79%moderate
November Weather1°C (34°F)52 mm (2.0 inches)88%moderate
December Weather-4°C (26°F)43 mm (1.7 inches)82%low

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