September 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
Average temperature in September - Ottawa, Canada
  • Average high temperature in September: 20.4°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 September: 9.6°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 September - Ottawa, Canada
  • Average humidity in September: 59.1%

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 September - Ottawa, Canada
  • Average rainfall in September: 90.1mm

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 September - Ottawa, Canada
  • Average rainfall days in September: 12.3 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 September - Ottawa, Canada
  • Average snowfall in September: 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 September - Ottawa, Canada
  • Average snowfall days in September: 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 September / Average sunshine in September - Ottawa, Canada
  • Average daylight in September: 12.5h

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 September: 7.1h

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 September - Ottawa, Canada
  • Average UV index in September: 5

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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