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March Weather in Saint Charles, United States

Last updated: June 24, 2025

In March, the average temperature in Saint Charles, United States hovers around 1°C (34°F), presenting a chilly atmosphere. Expect the mercury to dip as low as -25°C (-12°F), while occasionally reaching a pleasant 20°C (69°F). During this month, precipitation averages 57 mm (2.2 in) over 9 days, contributing to a notably high average humidity of 84%. Stay warm and prepared!

March Temperature in Saint Charles

In March in Saint Charles, the average temperature is 1°C (34°F). Maximums can reach 20°C (69°F), while minimums can drop as low as -25°C (-12°F). It is advisable to pack warm clothing and layers for your travels to ensure comfort in this varied climate.

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

The chart illustrates March 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, March typically has an average temperature of 1°C (34°F), with highs reaching up to 20°C (69°F) and lows dropping to around -25°C (-12°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.

March Precipitation in Saint Charles

In Saint Charles in March, the total precipitation amount is 57 mm (2.2 in) over the course of 9 days.

March Precipitation Trends in Saint Charles

The chart displays monthly precipitation patterns in Saint Charles, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In Saint Charles, March typically receives around 57 mm (2.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec364857861521511031261171195243
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Saint Charles

In Saint Charles in March humidity is 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp air.

March Average Humidity in Saint Charles

This chart illustrates the average monthly humidity levels in Saint Charles, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in Saint Charles is approximately 84%, 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 March generated using information from the Copernicus Climate Change Service.

March UV Index in Saint Charles

In Saint Charles in March, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Saint Charles.

Maximum UV Index Levels in Saint Charles for March

The chart shows the monthly maximum UV Index (UVI) for Saint Charles in March, 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 March, the maximum UV index in Saint Charles typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101098532
Data source: Saint Charles March 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 March 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 March’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 March’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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