April Weather in Ottawa, United States

Last updated: June 24, 2025

In April, the average temperature in Ottawa, United States hovers around 13°C (55°F). Weather conditions can vary significantly, with minimum temperatures dipping to -6°C (21°F) and highs soaring to 30°C (87°F). Expect about 96 mm (3.8 in) of precipitation spread over 11 days, while average humidity sits at a comfortable 73%.

April Temperature in Ottawa

In April in Ottawa, the average temperature is 13°C (55°F), with maximums reaching 30°C (87°F) and minimums dropping as low as -6°C (21°F). This range suggests that travelers should prepare for a mix of warm and chilly days, making layers essential for comfort during their visit.

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

The chart illustrates April 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, April typically has an average temperature of 13°C (55°F), with highs reaching up to 30°C (87°F) and lows dropping to around -6°C (21°F).

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

April Precipitation in Ottawa

In Ottawa in April, the precipitation amount is 96 mm (3.8 in) spread over 11 days, resulting in a significant accumulation of rainfall.

April Precipitation Trends in Ottawa

The chart displays monthly precipitation patterns in Ottawa, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Ottawa, April typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

April Humidity in Ottawa

In Ottawa in April humidity is 73%. With an average temperature of 13°C (55°F), this humidity feels like a damp chill that can penetrate layers of clothing, making it essential for travelers to dress in warm, moisture-wicking fabrics to stay comfortable while exploring.

April Average Humidity in Ottawa

This chart illustrates the average monthly humidity levels in Ottawa, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Ottawa is approximately 73%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Ottawa

In Ottawa in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Ottawa.

Maximum UV Index Levels in Ottawa for April

The chart shows the monthly maximum UV Index (UVI) for Ottawa in April, 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 April, the maximum UV index in Ottawa typically reaches 9, which falls under the very high exposure category.

Data source: Ottawa April 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 April 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 April’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 April’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