| < September >
|Normal Max/ High Temperature
|Min/ Low Temperature
|Number of Wet Days (probability of rain on a day)
|Average Sunlight per day
|Average Daylight per day
|Sunny (Cloudy) Daylight Hours
|Sun altitude at solar noon on the 21st day.
- 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
Navigate to September Weather in Locations Surrounding Ottawa, Ontario:
- Maniwaki, Qc, Canada - 113.5 kms (70.5 miles) NNW
- Petawawa, On, Canada - 147.2 kms (91.4 miles) WNW
- Bonavista, Nf, Canada - 138.2 kms (85.9 miles) WNW
- Ottawa (Airport), Canada - 1.6 kms (1 miles) NNW
- Kingston, On, Canada - 142.1 kms (88.3 miles) SSW
- Watertown, Ny, Usa - 148.1 kms (92 miles) S
- Kuujjuarapik, Qc, Canada - 132.9 kms (82.6 miles) ENE
- Montreal, Quebec, Canada - 176.6 kms (109.7 miles) E
- Montreal/ Dorval, Qc, Canada - 150.2 kms (93.3 miles) E
- Canton, Ny, Usa - 62.2 kms (38.6 miles) ESE
- Ogdensburge, Ny, Usa - 62.2 kms (38.6 miles) ESE
- Lake Placid , Ny, Usa - 175.2 kms (108.9 miles) SE
- Lowville, Ny, Usa - 169.9 kms (105.6 miles) S