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March Weather in St. Catharines, Canada

Last updated: June 18, 2025

In March, the average temperature in St. Catharines, Canada hovers around 1°C (35°F). Expect minimums plunging to -13°C (9°F) and a pleasant maximum of 15°C (60°F). With an average humidity of 88%, it’s a damp month, as you'll likely encounter 71 mm (2.8 in) of precipitation spread over 10 days.

March Temperature in St. Catharines

In March in St. Catharines, the average temperature is 1°C (35°F). Maximums can reach 15°C (60°F), while minimums can drop as low as -13°C (9°F). Be sure to pack warm clothing and prepare for chilly conditions during your visit.

March Weather in St. Catharines: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in St. Catharines, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Catharines, March typically has an average temperature of 1°C (35°F), with highs reaching up to 15°C (60°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec282935435365737266554234
Data source: Temperature data for St. Catharines 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 St. Catharines

In St. Catharines in March, the precipitation amount is 71 mm (2.8 in) over a duration of 10 days.

March Precipitation Trends in St. Catharines

The chart displays monthly precipitation patterns in St. Catharines, 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 St. Catharines, March typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7786711191018210680691268686
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in St. Catharines

In St. Catharines in March, humidity is 88%. With an average temperature of 1°C (35°F), this humidity feels like a chilly embrace, making travel quite uncomfortable as the cold moisture clings to your skin, leaving you feeling damp and frigid.

March Average Humidity in St. Catharines

This chart illustrates the average monthly humidity levels in St. Catharines, 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 St. Catharines is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in St. Catharines

In St. Catharines 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 St. Catharines.

Maximum UV Index Levels in St. Catharines for March

The chart shows the monthly maximum UV Index (UVI) for St. Catharines 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 St. Catharines typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: St. Catharines 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 St. Catharines Compares to Other Months

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

This table compares monthly weather conditions in St. Catharines, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)77 mm (3.0 inches)91%low
February Weather-2°C (29°F)86 mm (3.4 inches)91%moderate
March Weather1°C (35°F)71 mm (2.8 inches)88%moderate
April Weather6°C (43°F)119 mm (4.7 inches)88%very high
May Weather12°C (54°F)101 mm (4.0 inches)82%very high
June Weather18°C (65°F)82 mm (3.2 inches)79%very high
July Weather23°C (73°F)106 mm (4.2 inches)77%very high
August Weather22°C (72°F)80 mm (3.1 inches)72%very high
September Weather19°C (66°F)69 mm (2.7 inches)76%high
October Weather13°C (56°F)126 mm (4.9 inches)83%moderate
November Weather5°C (42°F)86 mm (3.4 inches)88%moderate
December Weather1°C (35°F)86 mm (3.4 inches)87%low

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