Weather in September in Ottawa (Airport)

< September >
	Normal Max/ High Temperature	20°C (67°F)
	Average Temperature	14°C (58°F)
	Min/ Low Temperature	9°C (48°F)
	Normal Precipitation	83mm (3.3in)
	Average Daylight per day	12h 29'
	Sun altitude at solar noon on the 21st day.	45.2°

The average temperature in Ottawa (Airport) in September is mild at 14.3 °C (57.74 °F).
Afternoons can be warm with average high temperatures reaching 19.6 °C (67.3 °F).
Overnight temperatures are generally a little cool with an average low of 8.9 °C (48 °F).
The mean diurnal temperature variation/ range in September is 10.7 °C (19.3 °F).
Precipitation averages for September are high with 82.9mm (3.3 in) recorded.
The shortest day is 11h 42' long and the longest day is 13h 15' long with an average length of 12h 29'.

Weather Trend Graph for September in Ottawa (Airport), Canada

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