July Weather in Ottawa, United States

Last updated: June 24, 2025

In Ottawa, United States, the average temperature in July is a warm 27°C (80°F). Visitors can expect a temperature range with a minimum of 16°C (61°F) and a maximum soaring to 38°C (101°F). During this month, 112 mm (4.4 in) of precipitation typically falls over 10 days, contributing to an average humidity level of 81%. Be prepared for a tropical climate!

July Temperature in Ottawa

In July in Ottawa, the average temperature is 27°C (80°F). Maximums can reach up to 38°C (101°F), while minimums can drop to as low as 16°C (61°F). Be sure to pack both light clothing for the heat and a few layers for the cooler evenings when traveling there.

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

The chart illustrates July 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, July typically has an average temperature of 27°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 16°C (61°F).

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

July Precipitation in Ottawa

In Ottawa in July, the total precipitation amount is 112 mm (4.4 in) over the course of 10 days.

July Precipitation Trends in Ottawa

The chart displays monthly precipitation patterns in Ottawa, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Ottawa, July typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Ottawa

In Ottawa in July, humidity is 81%. With an average temperature of 27°C (80°F), this humidity feels like a warm blanket wrapping around you, making travel feel sticky and heavy, but the vibrant atmosphere can still be invigorating, inviting moments of exploration in slower, more deliberate steps.

July Average Humidity in Ottawa

This chart illustrates the average monthly humidity levels in Ottawa, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Ottawa is approximately 81%, offering insight into how humid the weather typically is during this month.

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

July UV Index in Ottawa

In Ottawa in July, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Ottawa.

Maximum UV Index Levels in Ottawa for July

The chart shows the monthly maximum UV Index (UVI) for Ottawa in July, 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 July, the maximum UV index in Ottawa typically reaches 11, which falls under the extreme exposure category.

Data source: Ottawa July 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 July 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 July’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 July’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