March Weather in Ottawa, United States

Last updated: June 24, 2025

In March, the average temperature in Ottawa, United States hovers around 9°C (48°F), with extremes reaching as low as -17°C (2°F) and soaring up to 29°C (85°F). Expect 98 mm (3.9 in) of precipitation over approximately 11 days, contributing to an average humidity level of 70%. This blend of cool temperatures and moisture makes for a unique climatic experience!

March Temperature in Ottawa

In March in Ottawa, the average temperature is 9°C (48°F), with maximums reaching up to 29°C (85°F) and minimums dropping as low as -17°C (2°F). This wide range of temperatures means travelers should be prepared for both warm and chilly conditions.

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 9°C (48°F), with highs reaching up to 29°C (85°F) and lows dropping to around -17°C (2°F).

Data source: Temperature data for Ottawa generated using information from the Copernicus Climate Change Service.

March Precipitation in Ottawa

In Ottawa in March, the total precipitation amount is 98 mm (3.9 in) over the course of 11 days.

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 98 mm (3.9 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

March Humidity in Ottawa

In Ottawa in March, humidity is 70%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that can quickly sap your energy, making outdoor activities less enjoyable and requiring extra layers to stay warm and dry while traveling.

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 70%, offering insight into how humid the weather typically is during this month.

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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the 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 7, which falls under the high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (33°F)	56 mm (2.2 inches)	76%	moderate
February Weather	1°C (34°F)	36 mm (1.4 inches)	77%	high
March Weather	9°C (48°F)	98 mm (3.9 inches)	70%	high
April Weather	13°C (55°F)	96 mm (3.8 inches)	73%	very high
May Weather	19°C (66°F)	196 mm (7.7 inches)	82%	very high
June Weather	25°C (77°F)	109 mm (4.3 inches)	82%	extreme
July Weather	27°C (80°F)	112 mm (4.4 inches)	81%	extreme
August Weather	25°C (77°F)	120 mm (4.7 inches)	78%	very high
September Weather	22°C (73°F)	81 mm (3.2 inches)	71%	very high
October Weather	14°C (58°F)	115 mm (4.5 inches)	71%	high
November Weather	7°C (45°F)	41 mm (1.6 inches)	81%	moderate
December Weather	4°C (39°F)	33 mm (1.3 inches)	84%	moderate