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

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
August, the last month of the summer, in Ottawa, is another warm month, with average temperature ranging between min 14.3°C (57.7°F) and max 25.3°C (77.5°F).

Temperature

In August, the average high-temperature is essentially the same as in July - a still moderately hot 25.3°C (77.5°F). In Ottawa, the average low-temperature is 14.3°C (57.7°F).

Humidity

In August, the average relative humidity is 55%.

Rainfall

In Ottawa, during August, the rain falls for 11 days and regularly aggregates up to 85.5mm (3.4") 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

Throughout the year, 2234mm (88") of snow is accumulated.

Daylight

The average length of the day in August is 14h.

Sunshine

The average sunshine in Ottawa, Canada, is 7.5h.

UV index

The average daily maximum UV index in August is 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to the UV radiation for ordinary individuals.
In August, the average maximum UV index of 7 translate into the following recommendations:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in August in Ottawa?

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).

What is the average humidity in August in Ottawa?

The average relative humidity in August is 55%.

How much does it rain in Ottawa in August?

In Ottawa, in August, during 11 rainfall days, 85.5mm (3.4") of precipitation is typically accumulated.

How many hours of daylight does Ottawa have in August?

In Ottawa, the average length of the day in August is 14h.

How long on average sun shines in August in Ottawa?

In Ottawa, the average sunshine in August is 7.5h.

How high is the UV index in August in Ottawa?

In Ottawa, the average daily maximum UV index in August is 7. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to the UV radiation.
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).