Ottawa September 11 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of September 11.
September 11 All-Time Records
1889–2024
Highest temperature 36.7 °C 1931
Lowest temperature 1.1 °C 1933
Lowest daily high 12.2 °C 1928
Highest daily low 21.1 °C 1961
Most precipitation 8.34 cm 1986
Most snow none -
September 11 Average Weather
1991–2020 1
Average high 22.2 °C
Average low 11.3 °C
Chance precipitation 37.2%
Chance snow 0%
Ottawa September 11 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 30.0 11.0 0.00 0.0
2022 28.0 13.0 0.00 0.0
2021 25.0 10.0 0.28 0.0
2020 17.5 8.5 0.00 0.0
2019 25.5 12.0 0.00 0.0
2018 18.5 12.0 0.00 0.0
2017 22.0 8.0 0.00 0.0
2016 19.0 14.0 0.00 0.0
2015 25.3 11.2 0.37 0.0
2014 23.0 15.0 0.02 0.0
2013 28.6 14.8 0.70 0.0
2012 22.9 5.0 0.00 0.0
2011 25.0 6.7 0.00 0.0
2010 23.5 6.9 0.00 0.0
2009 22.7 8.0 0.00 0.0
2008 20.7 4.4 0.06 0.0
2007 17.3 14.0 1.14 0.0
2006 17.0 5.1 0.00 0.0
2005 24.5 8.0 0.00 0.0
2004 24.9 7.6 0.00 0.0
2003 29.6 14.7 0.00 0.0
2002 17.3 11.8 0.06 0.0
2001 22.8 13.3 0.00 0.0
2000 21.8 17.7 0.38 0.0
1999 23.2 11.5 0.00 0.0
1998 25.4 7.8 0.12 0.0
1997 18.5 15.8 2.56 0.0
1996 24.2 12.7 2.40 0.0
1995 21.6 3.6 0.00 0.0
1994 18.8 11.3 0.00 0.0
1993 14.8 8.0 0.00 0.0
1992 14.3 10.3 0.00 0.0
1991 17.5 9.7 0.00 0.0
1990 19.9 11.0 0.00 0.0
1989 19.8 15.0 0.00 0.0
1988 16.7 11.3 0.00 0.0
1987 22.3 13.3 0.84 0.0
1986 20.5 14.4 8.34 0.0
1985 15.5 5.4 0.00 0.0
1984 18.3 14.1 0.04 0.0
1983 25.5 20.5 0.00 0.0
1982 27.0 14.5 0.00 0.0
1981 14.5 11.5 0.66 0.0
1980 24.0 12.0 0.00 0.0
1979 15.0 6.0 0.00 0.0
1978 19.5 10.5 0.48 0.0
1977 17.0 8.5 0.00 0.0
1976 13.9 6.7 0.10 0.0
1975 26.7 8.3 2.87 0.0
1974 26.7 11.1 0.00 0.0
1973 21.1 11.7 0.10 0.0
1972 23.9 9.4 0.08 0.0
1971 22.8 13.9 0.20 0.0
1970 21.1 8.9 0.00 0.0
1969 17.2 7.8 0.00 0.0
1968 18.3 16.7 2.08 0.0
1967 18.9 4.4 0.00 0.0
1966 20.0 10.0 0.00 0.0
1965 17.2 5.0 0.00 0.0
1964 19.4 17.2 0.00 0.0
1963 24.4 10.0 0.33 0.0
1962 18.3 12.2 0.08 0.0
1961 31.1 21.1 0.15 0.0
1960 19.4 8.9 0.00 0.0
1959 16.7 10.0 0.00 0.0
1958 16.7 9.4 0.00 0.0
1957 22.8 14.4 0.00 0.0
1956 15.6 12.2 0.08 0.0
1955 13.9 11.1 0.71 0.0
1954 15.6 14.4 0.00 0.0
1953 25.6 10.0 0.00 0.0
1952 30.6 16.7 0.00 0.0
1951 26.1 16.7 0.00 0.0
1950 20.0 13.3 0.00 0.0
1949 22.2 5.6 0.00 0.0
1948 20.6 6.7 0.41 0.0
1947 31.1 18.9 0.36 0.0
1946 15.0 14.4 0.00 0.0
1945 24.4 17.8 0.30 0.0
1944 27.2 8.3 0.00 0.0
1943 14.4 7.8 0.23 0.0
1942 24.4 8.9 0.00 0.0
1941 16.7 10.0 0.00 0.0
1940 14.4 6.7 0.00 0.0
1939 18.3 9.4 0.00 0.0
1938 23.3 5.0 0.00 0.0
1937 21.1 15.6 3.20 0.0
1936 23.3 12.8 2.39 0.0
1935 21.7 7.8 0.00 0.0
1934 23.9 9.4 0.00 0.0
1933 13.3 1.1 0.00 0.0
1932 23.9 3.3 0.00 0.0
1931 36.7 17.2 0.00 0.0
1930 25.0 5.6 0.00 0.0
1929 21.7 10.0 0.00 0.0
1928 12.2 11.1 1.93 0.0
1927 25.0 13.9 0.05 0.0
1926 22.2 7.8 0.00 0.0
1925 28.3 13.9 1.83 0.0
1924 13.3 5.0 0.15 0.0
1923 20.6 3.3 0.00 0.0
1922 30.0 16.7 0.91 0.0
1921 26.7 11.7 0.08 0.0
1920 19.4 11.7 0.05 0.0
1919 18.9 11.1 0.28 0.0
1918 13.9 1.1 0.00 0.0
1917 15.6 1.1 0.00 0.0
1916 25.6 7.8 0.00 0.0
1915 22.8 14.4 0.00 0.0
1914 17.8 5.6 0.00 0.0
1913 19.4 10.0 0.00 0.0
1912 21.1 14.4 0.51 0.0
1911 25.6 10.6 0.00 0.0
1910 23.9 6.1 0.00 0.0
1909 16.7 10.0 0.05 0.0
1908 28.9 15.6 0.00 0.0
1907 20.6 16.7 0.48 0.0
1906 30.6 9.4 0.00 0.0
1905 25.6 11.1 0.00 0.0
1904 26.7 15.0 0.00 0.0
1903 22.2 11.1 0.00 0.0
1902 25.0 7.2 0.00 0.0
1901 19.4 12.2 2.79 0.0
1900 14.4 10.0 1.14 0.0
1899 20.0 13.3 0.10 0.0
1898 20.0 2.2 0.00 0.0
1897 24.4 15.0 0.53 0.0
1896 31.7 15.0 0.00 0.0
1895 27.8 16.7 1.07 0.0
1894 17.2 8.3 0.00 0.0
1893 19.4 5.6 0.00 0.0
1892 23.3 14.4 0.00 0.0
1891 25.0 7.8 0.00 0.0
1890 15.0 11.1 2.72 0.0
What's the all-time high for Ottawa on 9/11?
For the date of Sep 11, the highest temperature ever reached in Ottawa history is 36.7 °C which happened in 1931.
Highest Temperatures in Ottawa on September 11
Rank Temperature Year
1 36.7 °C 1931
2 31.7 °C 1896
3 31.1 °C 1961
3 31.1 °C 1947
5 30.6 °C 1952
5 30.6 °C 1906
7 30.0 °C 1922
7 30.0 °C 2023
9 29.6 °C 2003
10 28.9 °C 1908
What's the all-time low for Ottawa on 9/11?
For the date of Sep 11, the lowest temperature ever reached in Ottawa history is 1.1 °C which has happened 3 times, most recently in 1933.
Lowest Temperatures in Ottawa on September 11
Rank Temperature Year
1 1.1 °C 1918
1 1.1 °C 1933
1 1.1 °C 1917
4 2.2 °C 1898
5 3.3 °C 1932
5 3.3 °C 1923
7 3.6 °C 1995
8 4.4 °C 2008
8 4.4 °C 1967
10 5.0 °C 1924
10 5.0 °C 1938
10 5.0 °C 2012
10 5.0 °C 1965
Lowest High Temperatures in Ottawa on September 11
Rank Temperature Year
1 12.2 °C 1928
2 13.3 °C 1933
2 13.3 °C 1924
4 13.9 °C 1955
4 13.9 °C 1976
4 13.9 °C 1918
7 14.3 °C 1992
8 14.4 °C 1900
8 14.4 °C 1943
8 14.4 °C 1940
What's the most it has ever rained in Ottawa on 9/11?
For the date of Sep 11, the most precipitation ever recorded in Ottawa history is 8.34 cm which happened in 1986.
All-Time Most Precipitation in Ottawa on September 11
Rank Precipitation Year
1 8.34 cm 1986
2 3.20 cm 1937
3 2.87 cm 1975
4 2.79 cm 1901
5 2.72 cm 1890
6 2.56 cm 1997
7 2.40 cm 1996
8 2.39 cm 1936
9 2.08 cm 1968
10 1.93 cm 1928
Weather Station Details
Years Station Coordinates
1889–2024 Ottawa CDA location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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