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March Weather in Ottawa, United States

Last updated: June 24, 2025

In Ottawa, United States, the average temperature in March hovers around 5°C (41°F), with the minimum plunging to -19°C (-2°F) and the maximum reaching a warm 26°C (79°F). Expect precipitation of approximately 93 mm (3.7 in) spread over 11 days, accompanied by average humidity levels of 84%.

March Temperature in Ottawa

In March in Ottawa, the average temperature is 5°C (41°F), with maximums that can reach 26°C (79°F) and minimums that can drop as low as -19°C (-2°F). This varied climate makes Ottawa an interesting destination to explore, so be sure to pack for both warm and cold weather.

March Weather in Ottawa: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in Ottawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ottawa, March typically has an average temperature of 5°C (41°F), with highs reaching up to 26°C (79°F) and lows dropping to around -19°C (-2°F).
JanFebMarAprMayJunJulAugSepOctNovDec262841506373767369554034
Data source: Temperature data for Ottawa 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 Ottawa

In Ottawa in March, the precipitation amount is 93 mm (3.7 in) over the course of 11 days, indicating that rain is expected to be fairly frequent during that time.

March Precipitation Trends in Ottawa

The chart displays monthly precipitation patterns in Ottawa, 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 Ottawa, March typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec62669311716514510187911345755
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Ottawa

In Ottawa in March humidity is 84%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through the cold, heavy air that clings to your skin.

March Average Humidity in Ottawa

This chart illustrates the average monthly humidity levels in Ottawa, 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 Ottawa is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Ottawa

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

Maximum UV Index Levels in Ottawa for March

The chart shows the monthly maximum UV Index (UVI) for Ottawa 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 Ottawa typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Ottawa 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 Ottawa Compares to Other Months

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

This table compares monthly weather conditions in Ottawa, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)62 mm (2.5 inches)82%moderate
February Weather-2°C (28°F)66 mm (2.6 inches)83%moderate
March Weather5°C (41°F)93 mm (3.7 inches)84%high
April Weather10°C (50°F)117 mm (4.6 inches)85%very high
May Weather17°C (63°F)165 mm (6.5 inches)79%very high
June Weather23°C (73°F)145 mm (5.7 inches)82%very high
July Weather24°C (76°F)101 mm (4.0 inches)80%very high
August Weather23°C (74°F)87 mm (3.4 inches)81%very high
September Weather20°C (69°F)91 mm (3.6 inches)80%very high
October Weather13°C (56°F)134 mm (5.3 inches)82%high
November Weather4°C (40°F)57 mm (2.2 inches)88%moderate
December Weather1°C (34°F)55 mm (2.2 inches)84%low

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