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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 5°C (41°F), but you might experience a range from a frigid -21°C (-5°F) to a balmy 23°C (74°F). Expect approximately 85 mm (3.3 in) of precipitation spread over 9 days, and don't forget to prepare for moisture in the air with an average humidity of 77%.

March Temperature in Saint Charles

In March in Saint Charles, the average temperature is 5°C (41°F). The maximum can reach 23°C (74°F), and the minimum can be as low as -21°C (-5°F). Be prepared for a wide range of temperatures when planning your trip to Saint Charles during this time.

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 5°C (41°F), with highs reaching up to 23°C (74°F) and lows dropping to around -21°C (-5°F).
JanFebMarAprMayJunJulAugSepOctNovDec232540506375787469533932
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 precipitation amount is 85 mm (3.3 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 85 mm (3.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec4139856916311769761171344336
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 77%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable unless you're bundled up in warm layers.

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 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
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 is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Saint Charles, you can refer to this 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 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
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-5°C (23°F)41 mm (1.6 inches)78%moderate
February Weather-4°C (25°F)39 mm (1.6 inches)80%moderate
March Weather5°C (41°F)85 mm (3.3 inches)77%high
April Weather10°C (50°F)69 mm (2.7 inches)77%very high
May Weather17°C (63°F)163 mm (6.4 inches)77%very high
June Weather24°C (75°F)117 mm (4.6 inches)81%extreme
July Weather25°C (78°F)69 mm (2.7 inches)81%very high
August Weather24°C (75°F)76 mm (3.0 inches)77%very high
September Weather20°C (69°F)117 mm (4.6 inches)73%very high
October Weather12°C (53°F)134 mm (5.3 inches)75%high
November Weather4°C (39°F)43 mm (1.7 inches)85%moderate
December Weather0°C (32°F)36 mm (1.4 inches)83%moderate

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