Ottawa
Canada
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Ottawa, Canada

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
May, the last month of the spring, in Ottawa, is a comfortable month, with average temperature ranging between max 19°C (66.2°F) and min 7.5°C (45.5°F).

Temperature

In Ottawa, the average high-temperature in May rises, from a fresh 11.6°C (52.9°F) in April, to an enjoyable 19°C (66.2°F). In May, the average low-temperature is 7.5°C (45.5°F).

Humidity

With an average relative humidity of 49.9%, May is the least humid month.

Rainfall

In May, the rain falls for 13.4 days. Throughout May, 80.1mm (3.2") of precipitation is accumulated. In Ottawa, during the entire year, the rain falls for 118.4 days and collects up to 758.4mm (29.9") of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows in Ottawa. During 0.2 snowfall days, in May, Ottawa aggregates 2mm (0.1") of snow. In Ottawa, during the entire year, snow falls for 63.3 days, and aggregates up to 2234mm (88") of snow.

Daylight

The average length of the day in Ottawa, Canada, is 14.9h.

Sunshine

The average sunshine in Ottawa, Canada, is 6.8h.

UV index

In May, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in May in Ottawa?

The average high-temperature, in May, is 19°C (66.2°F), while the average low-temperature is 7.5°C (45.5°F).

What is the least humid month in Ottawa?

May is the least humid month, with an average relative humidity of 49.9%.

What is the average humidity in May in Ottawa?

In May, the average relative humidity in Ottawa, Canada, is 49.9%.

How much does it rain in Ottawa in May?

In Ottawa, Canada, in May, during 13.4 rainfall days, 80.1mm (3.2") of precipitation is typically accumulated.

What is the last month it snows in Ottawa?

May is the last month it regularly snows in Ottawa, Canada. During 0.2 snowfall days, in May, Ottawa aggregates 2mm (0.1") of snow.

How many hours of daylight does Ottawa have in May?

The average length of the day in May in Ottawa, Canada, is 14.9h.

How long on average sun shines in May in Ottawa?

In Ottawa, the average sunshine in May is 6.8h.

What is the UV index intensity in May in Ottawa?

In Ottawa, Canada, the average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in May - Ottawa, Canada
  • Average high temperature in May: 19°C

The warmest month (with the highest average high temperature) is July (26.5°C).
The month with the lowest average high temperature is January (-5.8°C).

  • Average low temperature in May: 7.5°C

The month with the highest average low temperature is July (15.5°C).
The coldest month (with the lowest average low temperature) is January (-14.8°C).

Average humidity in May - Ottawa, Canada
  • Average humidity in May: 49.9%

The month with the highest relative humidity is December (72.2%).
The month with the lowest relative humidity is May (49.9%).

Average rainfall in May - Ottawa, Canada
  • Average rainfall in May: 80.1mm

The wettest month (with the highest rainfall) is June (92.8mm).
The driest month (with the lowest rainfall) is February (18.7mm).

Average rainfall days in May - Ottawa, Canada
  • Average rainfall days in May: 13.4 days

The month with the highest number of rainy days is October (13.7 days).
The month with the lowest number of rainy days is February (3.9 days).

Average snowfall in May - Ottawa, Canada
  • Average snowfall in May: 2mm

The month with the highest snowfall is January (539mm).
Months with the lowest snowfall are June, July, August and September (0mm).

Average snowfall days in May - Ottawa, Canada
  • Average snowfall days in May: 0.2 days

The month with the highest number of snowfall days is January (16.1 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

Average daylight in May / Average sunshine in May - Ottawa, Canada
  • Average daylight in May: 14.9h

The month with the longest days is June (Average daylight: 15.6h).
The month with shortest days is December (Average daylight: 8.8h).

  • Average sunshine in May: 6.8h

The month with most sunshine is July (Average sunshine: 9.7h).
The month with least sunshine is December (Average sunshine: 2.2h).

Average UV index in May - Ottawa, Canada
  • Average UV index in May: 6

The month with the highest UV index is June (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).