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March Weather in Saint Marys, United States

Last updated: June 24, 2025

In March, the average temperature in Saint Marys, United States is a cool 5°C (42°F). Expect temperatures to range from a chilly -13°C (8°F) to a mild 24°C (75°F). During this time, you can anticipate around 102 mm (4.0 in) of precipitation spread over 12 days, contributing to a relatively high average humidity of 87%.

March Temperature in Saint Marys

In March in Saint Marys, the average temperature is 5°C (42°F). Maximum temperatures can reach 24°C (75°F), while minimums can drop as low as -13°C (8°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates March temperature patterns in Saint Marys, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Marys, March typically has an average temperature of 5°C (42°F), with highs reaching up to 24°C (75°F) and lows dropping to around -13°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241516372767368574135
Data source: Temperature data for Saint Marys 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 Marys

In Saint Marys in March, the total precipitation amount is 102 mm (4.0 in), occurring over a span of 12 days.

March Precipitation Trends in Saint Marys

The chart displays monthly precipitation patterns in Saint Marys, 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 Marys, March typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec74931029813012510910973968569
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Saint Marys

In Saint Marys in March humidity is 87%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and travel less inviting as the air becomes heavy and oppressive.

March Average Humidity in Saint Marys

This chart illustrates the average monthly humidity levels in Saint Marys, 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 Marys is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Saint Marys

In Saint Marys 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 Marys, you can refer to this Hourly UV Index in Saint Marys.

Maximum UV Index Levels in Saint Marys for March

The chart shows the monthly maximum UV Index (UVI) for Saint Marys 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 Marys typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Saint Marys 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 Marys Compares to Other Months

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

This table compares monthly weather conditions in Saint Marys, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (30°F)74 mm (2.9 inches)88%moderate
February Weather0°C (32°F)93 mm (3.7 inches)87%moderate
March Weather5°C (42°F)102 mm (4.0 inches)87%high
April Weather10°C (51°F)98 mm (3.9 inches)87%very high
May Weather17°C (63°F)130 mm (5.1 inches)81%very high
June Weather22°C (72°F)125 mm (4.9 inches)82%very high
July Weather24°C (76°F)109 mm (4.3 inches)81%very high
August Weather23°C (73°F)109 mm (4.3 inches)78%very high
September Weather20°C (69°F)73 mm (2.9 inches)78%very high
October Weather14°C (57°F)96 mm (3.8 inches)82%high
November Weather5°C (42°F)85 mm (3.4 inches)89%moderate
December Weather2°C (35°F)69 mm (2.7 inches)86%low

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