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Weather in September in Ottawa, Ontario

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< September >
 
Normal Max/ High Temperature 20°C (67°F)
 
Average Temperature 15°C (58°F)
 
Min/ Low Temperature 10°C (49°F)
 
Normal Precipitation 84mm (3.3in)
Number of Wet Days (probability of rain on a day) 11 (37%)
Average Sunlight per day 05:34
Average Daylight per day 12:29
Sunny (Cloudy) Daylight Hours 45% (55%)
Sun altitude at solar noon on the 21st day.
45.2°


  • The average temperature in Ottawa, Ontario in September is mild at 14.7 °C (58.46 °F).
  • Afternoons can be warm with average high temperatures reaching 19.7 °C (67.5 °F).
  • Overnight temperatures are generally a little cool with an average low of 9.6 °C (49.3 °F).
  • In September the range/ variation of diurnal mean temperatures is 10.1 °C (18.2 °F).
  • The weather in September is dryish with rain now and again. Just 83.6mm (3.3in) of H2O is deposited across an average of 11 days.
  • The blue above Ottawa, Ontario is fair with on balance an unexceptional 5:34 of brilliant sunlight daily.
  • The shortest day is 11:42 long and the longest day is 13:15 long with an average length of 12:29.
  • There are approximately 6:42 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 45.4% of daylight hours and cloudy 54.6% of daylight hours.

Check the distance to and compare the Ottawa, Ontario September averages with somewhere beginning with:

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Weather Trend Graph for September in Ottawa, Ontario, Canada

Graph of weather in Ottawa, Ontario in September

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