Climate and monthly weather forecast
Ottawa, Canada

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A view of The Parliament Hill from the Ottawa River in Ottawa, Canada
A view of The Parliament Hill from the Ottawa River in Ottawa, Canada

The climate of Ottawa

Defined by the Köppen climate classification as Dfb, meaning a humid continental climate with no dry season but warm summer, the weather patterns in Ottawa, Canada exhibit distinct seasonal variations. This capital city positioned in the eastern part of the country witnesses temperatures from -14.5°C (5.9°F) in January to 25.3°C (77.5°F) in July.

Across the cycle of a year, the average high temperature varies from -6.3°C (20.7°F) in January to 25.3°C (77.5°F) in July whereas the average low temperature ranges from -14.5°C (5.9°F) in January to 14.5°C (58.1°F) in July. With relative humidity primarily between 77% in May and 91% in January, the city experiences a predominantly moist atmosphere throughout the year.

Rainfall fluctuations have been noted from 54mm (2.13") in September to 78mm (3.07") in October and snowfall from 321mm (12.64") in January to mere traces of 2mm (0.08") in May and complete absence in June through September. Ottawa receives snow with varying intensity from 19.8 days in January decreasing to 0.4 days in May and then again rising to 16.6 days in December.

Interestingly, the daylight hours fluctuate between 8.8 hours in December to 15.6 hours in June, influencing the availability of sunshine. Ottawa receives maximum sunshine of 10.2 hours in July and least of 2.8 hours in February. The city also has an UV index that fluctuates moderately from 1 between December and February to 5 from June to August.

The best time to visit Ottawa

The best time to visit Ottawa largely depends on the visitor's affinity for specific weather conditions. Those keen on experiencing warm temperatures with more extended daylight hours may find May through September ideal. During these months, the average high temperature ranges between 17.7°C (63.9°F) and 25.3°C (77.5°F) with daylight varying from 14.9 hours in May to 13.7 hours in September. With relative humidity from 77% to 80%, the atmosphere remains comfortably moist.

The worst time to visit Ottawa

Considering the harsh winter conditions, January to March may not be the ideal time to visit Ottawa. The average low temperature during these months falls between -14.5°C (5.9°F) and -6.8°C (19.8°F) with heavy snowfall of 321mm (12.64") in January reducing to 170mm (6.69") in March, making outdoor activities somewhat challenging.

Spring weather in Ottawa

Spring weather in Ottawa transitions from cold to moderate temperatures with March experiencing -6.8°C (19.8°F) to 0.8°C (33.4°F) in April. Rainfall during this season ranges from 59mm (2.32") to 73mm (2.87"). Daylight increases steadily from 12 hours in March to 13.6 hours in April, providing ample sunshine.

Summer weather in Ottawa

Summers in Ottawa are characterized by warm temperatures with average highs fluctuating between 21.6°C (70.9°F) in June to 24°C (75.2°F) in August. Rainfall averages from 63mm (2.48") to 68mm (2.68") and there is no incidence of snow during these months. The longer daylight hours range from 15.3 hours to 15.6 hours giving way to ample sunshine.

Autumn weather in Ottawa

Autumn in Ottawa witnesses a gradual decrease in temperature from 20.2°C (68.4°F) in September to 4.6°C (40.3°F) in November. Rainfall during this period fluctuates from 54mm (2.13") in September to 78mm (3.07") in October. The daylight hours reduce to 10.9 hours by November beginning with 12.5 hours in September.

Winter weather in Ottawa

Winters in Ottawa are cold with temperatures ranging from 4.6°C (40.3°F) in December with a drastic plunge to -6.3°C (20.7°F) by January. This season witnesses considerable snowfall beginning from 107mm (4.21") in November peaking at 321mm (12.64") in January. The daylight hours shrink to 9.5 hours in December and further to 8.8 hours by January. During this period, the city also experiences limited sunshine.

Weather in January

January in Ottawa, Canada steps in with winter at its most powerful peak. The month exhibits the coldest temperatures for the year with a high of -6.3°C (20.7°F) and even more frigid lows of -14.5°C (5.9°F). Attesting to its winter status, weather conditions are definitely icy, frosty and generally face-bitingly cold. Weather in January »

Weather in February

Following January, February carries on the icy weather trend yet with a slight moderation in temperatures. Ottawa sees the heavy cloak of snow slightly lifting, and the bone-chilling temperatures of the previous month loosen their grip, preparing the city for the upcoming spring. Weather in February »

Weather in March

March in Ottawa signals the advent of spring with slight optimism in the air. From the frigid grip of February, temperatures get a significant boost to near freezing, rising on both high and low ends. A visible increase is placed on daylight hours and sunshine, significantly reducing the power of cold winter winds. Weather in March »

Weather in April

April sees the city finally break free from the clutch of winter, welcoming the warm embrace of spring. The transformation from freezing March temperatures to highs of 9.1°C (48.4°F) and lows of 0.4°C (32.7°F) in April becomes the first signal of the changing seasons. Weather in April »

Weather in May

By the time May dances into Ottawa's calendar, it carries the warmth and freshness of spring to its zenith. The weather becomes significantly benign with pleasant temperatures, increasing daylight hours and an evident reduction in wind speed. Weather in May »

Weather in June

June in Ottawa brings all the summer glory with it. Temperatures rise further to touch 21.6°C (70.9°F), indicating the significant changes in weather conditions from the spring season. Sunny days become a regular feature, ensuring maximum daylight hours for the month. Weather in June »

Weather in July

July in Ottawa is perhaps the city's favorite month, presenting weather conditions that are akin to summer in full bloom. The temperatures touch their peak for the year at 25.3°C (77.5°F), marking the zenith of the warm season. Outdoor activities reign supreme as parks and picnic spots get filled with residents and visitors alike. Weather in July »

Weather in August

As August strolls into Ottawa, it carries the last hints of summer along. There's a slight slip in temperatures from July's peak, yet the weather remains hospitable for outdoor activities. Despite the impending arrival of autumn, August keeps up the summer spirit with its warm days and balmy nights. Weather in August »

Weather in September

September marks the official arrival of autumn in Ottawa. With the temperatures falling from those in August, the weather begins to cool down, heralding the upcoming fall. The early fall weather sees a decrease in the amount of daylight hours, witnessing the slow progression towards the year's colder months. Weather in September »

Weather in October

October brings progressive cooling to Ottawa, with weather conditions taking further steps towards winter. The city observes an evident drop in temperatures from the previous month. However, it's during this month that Ottawa showcases an impressive fall color display, turning the city into a vivid canvas of burning reds and oranges. Weather in October »

Weather in November

November in Ottawa is a clear transition to the cold, cloudy winter days. The daylight hours significantly shrink, and the illumination of the sun becomes less frequent. Despite the plunge in temperatures and the city covering itself in a light blanket of snow, Ottawa doesn't lose its charm. Weather in November »

Weather in December

December, the final chapter of the year in Ottawa, Canada re-enshrines the icy dominion of winter. In comparison to November, December carries a stronger semblance of winter, with temperatures reaching a high of -2.7°C (27.1°F) and falling to an icy low of -8.4°C (16.9°F). Weather in December »

Frequently asked questions

What month is the coldest in Ottawa?

January is the month that records the lowest temperatures in Ottawa, with averages ranging from a high of -6.3°C (20.7°F) to a low of -14.5°C (5.9°F).

What are the most humid months in Ottawa?

January and February, with an average relative humidity of 91%, are most humid months.

How many days does it rain in Ottawa?

In Ottawa, Canada, during the entire year, the rain falls for 149.6 days and collects up to 772mm (30.39") of precipitation.

When does it snow in Ottawa?

Months with snowfall are January through May, October through December.

What is the snowiest month in Ottawa?

January is the month with the most snowfall in Ottawa, Canada. Snow falls for 19.8 days and accumulates 321mm (12.64") of snow.

How much does it snow in Ottawa?

In Ottawa, during the entire year, snow falls for 83.3 days and aggregates up to 1135mm (44.69") of snow.

What is the month with the lowest UV index in Ottawa?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1.

What is the month with the least sunshine in Ottawa?

The month with the least sunshine in Ottawa is February, with an average of 2.8h of sunshine.

When is Daylight Saving Time (DST) in Ottawa?

On Sunday, 10. March 2024, at 2:00 am, Daylight Saving Time starts in Ottawa, Canada, and the time zone changes from EST to EDT. Daylight Saving Time ends on Sunday, 03. November 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Ottawa?

With an average relative humidity of 77%, May is the least humid month.

When it does not snow in Ottawa?

In Ottawa, snow does not fall in June through September.

When are the longest days in Ottawa?

With an average of 15h and 36min of daylight, June has the longest days of the year in Ottawa.

When is the highest UV index in Ottawa?

June through August, with an average maximum UV index of 5, are months with the highest UV index in Ottawa, Canada.

What is the hottest time of year in Ottawa?

Ottawa, Canada, reaches its average highest temperatures in July, measuring 25.3°C (77.5°F) at the peak and 14.5°C (58.1°F) at the lowest.

What month has the most sunshine in Ottawa?

The month with the most sunshine is July, with an average of 10.2h of sunshine.

What is the driest month in Ottawa?

The month with the least rainfall in Ottawa is September, when the rain falls for 12.9 days and typically collects 54mm (2.13") of precipitation.

What is the wettest month in Ottawa?

October is the month with the most rainfall in Ottawa, Canada. Rain falls for 15 days and accumulates 78mm (3.07") of precipitation.

What is the month with the shortest days in Ottawa?

The month with the shortest days in Ottawa, Canada, is December, with an average of 8h and 48min of daylight.

Average temperature
Ottawa, Canada

Average temperature - Ottawa, Canada

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (20.7°F).

The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (5.9°F).

Average pressure
Ottawa, Canada

Average pressure - Ottawa, Canada

The months with the highest atmospheric pressure are March and November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed
Ottawa, Canada

Average wind speed - Ottawa, Canada

The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).

Average humidity
Ottawa, Canada

Average humidity - Ottawa, Canada

The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is May (77%).

Average rainfall
Ottawa, Canada

Average rainfall - Ottawa, Canada

The wettest month (with the highest rainfall) is October (3.07").
The driest month (with the least rainfall) is September (2.13").

Average rainfall days
Ottawa, Canada

Average rainfall days - Ottawa, Canada

The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (5.9 days).

Average snowfall
Ottawa, Canada

Average snowfall - Ottawa, Canada

The month with the highest snowfall is January (12.64").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Ottawa, Canada

Average snowfall days - Ottawa, Canada

The month with the highest number of snowfall days is January (19.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Ottawa, Canada

Average daylight / Average sunshine - Ottawa, Canada

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 2h and 48min).

Average sunshine days
Ottawa, Canada

Average sunshine days - Ottawa, Canada

The month with the most sunshine days is September (15 days).
The month with the least sunshine days is February (9.1 days).

Average UV index
Ottawa, Canada

Average UV index - Ottawa, Canada

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).

Average visibility
Ottawa, Canada

Average visibility - Ottawa, Canada

The months with the highest visibility are April, May, June, July, August and October (6mi).
The months with the lowest visibility are January and February (4mi).

Ottawa, Canada

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