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 fluctuating between 19°C (66.2°F) and 7.5°C (45.5°F).

Temperature

In May, the average high-temperature rises, from a cool 11.6°C (52.9°F) in April, to a comfortable 19°C (66.2°F). 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 Ottawa, during May, the rain falls for 13.4 days and regularly aggregates up to 80.1mm (3.2") of precipitation. In Ottawa, during the entire year, the rain falls for 118.4 days and collects up to 758.4mm (29.9") of precipitation.

Snowfall

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

Daylight

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

Sunshine

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

UV index

In May, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to the UV radiation for the ordinary person.
The average daily UV index of 6 in May transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Ottawa?

In Ottawa, in May, the average high-temperature is 19°C (66.2°F), and 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 in Ottawa, with an average relative humidity of 49.9%.

What is the average humidity in May in Ottawa?

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

How much does it rain in Ottawa in May?

In May, the rain falls for 13.4 days. Throughout May, 80.1mm (3.2") of precipitation is 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 is 14.9h.

How many hours of sunshine does Ottawa have in May?

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

What is the UV index intensity in May in Ottawa?

The average daily maximum UV index in May in Ottawa, Canada, is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to the UV radiation.
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).