August 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 August in Ottawa?

In Ottawa, Canada, in August, the average high-temperature is 25.3°C (77.5°F), and the average low-temperature is 14.3°C (57.7°F).

How many days does it rain in August in Ottawa?

In Ottawa, Canada, in August, it is raining for 11 days, with typically 85.5mm (3.4") of accumulated precipitation.
Average temperature in August - Ottawa, Canada
  • Average high temperature in August: 25.3°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 August: 14.3°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 August - Ottawa, Canada
  • Average humidity in August: 55%

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 August - Ottawa, Canada
  • Average rainfall in August: 85.5mm

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 August - Ottawa, Canada
  • Average rainfall days in August: 11 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 August - Ottawa, Canada
  • Average snowfall in August: 0mm

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 August - Ottawa, Canada
  • Average snowfall days in August: 0 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 August / Average sunshine in August - Ottawa, Canada
  • Average daylight in August: 14h

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 August: 7.5h

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 August - Ottawa, Canada
  • Average UV index in August: 7

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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