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

What is the temperature in May in Ottawa?

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

How many days does it rain in May in Ottawa?

In Ottawa, during May, the rain falls for 13.4 days and regularly aggregates up to 80.1mm (3.2") of precipitation.

What is the last month it snows in Ottawa?

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

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