Ottawa - Recent September Temperatures and Rainfall





The numbers here describe what the September weather in Ottawa, Ontario Canada was like for every year since 2010. A series of tables gives September data by year for temperature and precipitation.

They begin with average maximum and minimum temperatures in degrees Fahrenheit and Celsius. That's followed by how many hot or cold days occurred each September. Then there's information on how much rain actually landed this month during recent years, as well as how often Ottawa had wet weather.

The climate data come from weather measurements made near downtown Ottawa.

Temperature Weather iconTemperature

September temperature averages by year in Ottawa
High °F Low °F Year High °C Low °C
68 48 2020 20 9
71 49 2019 21 10
72 53 2018 22 12
75 54 2017 24 12
73 52 2016 23 11
75 55 2015 24 13
70 51 2014 21 11
68 48 2013 20 9
70 51 2012 21 10
74 54 2011 23 12
68 52 2010 20 11
Number of days in September when the temperature in Ottawa dropped to 0 or below, or rose to at least 21 or 32 degrees Celsius
0 °C
32 °F
Year 21 °C
70 °F
32 °C
90 °F
0 2020 12 0
0 2019 16 0
0 2018 16 0
0 2017 19 1
0 2016 19 0
0 2015 22 1
1 2014 18 0
0 2013 12 0
0 2012 12 0
0 2011 21 0
0 2010 9 1

Rainy Weather iconRain

This table gives the total precipitation that fell on Ottawa during September in each year from 2010. The number of days with precipitation counts the days when rainfall amounted to 0.254 millimeters (0.01 inches) or more.

Total rainfall for September in Ottawa
Days Year Inches Milli­metres
10 2020 2.0 50
12 2019 2.4 62
12 2018 3.0 77
7 2017 2.0 52
6 2016 3.0 77
7 2015 3.8 97
7 2014 3.8 97
8 2013 3.1 78
7 2012 5.6 143
8 2011 1.7 42
12 2010 6.0 153
Reference

Environment and Climate Change Canada. Historical Climate Data. Historical Data

Jay Lawrimore. 2016. Global Summary of the Month, Version 1.0. NOAA National Centers for Environmental Information. 

Ottawa - Recent Years
Ottawa - Extremes
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