Ottawa September 20 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of September 20.
September 20 All-Time Records
1889–2024
Highest temperature 32.0 °C 1983
Lowest temperature -2.2 °C 1929
Lowest daily high 8.0 °C 1977
Highest daily low 20.7 °C 2002
Most precipitation 2.89 cm 1999
Most snow none -
September 20 Average Weather
1991–2020 1
Average high 20.2 °C
Average low 9.7 °C
Chance precipitation 42.8%
Chance snow 0%
Ottawa September 20 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 19.5 8.0 0.00 0.0
2022 16.0 12.0 0.00 0.0
2021 25.0 6.0 0.00 0.0
2020 16.0 4.0 0.00 0.0
2019 26.0 9.5 0.00 0.0
2018 18.0 7.0 1.32 0.0
2017 26.5 17.5 0.00 0.0
2016 26.0 16.0 0.00 0.0
2015 18.2 10.3 0.00 0.0
2014 22.5 4.5 0.70 0.0
2013 26.2 9.9 0.40 0.0
2012 20.0 3.4 0.24 0.0
2011 21.8 13.4 0.04 0.0
2010 18.2 5.0 0.04 0.0
2009 22.5 1.8 0.00 0.0
2008 23.3 7.9 0.05 0.0
2007 25.2 13.6 0.00 0.0
2006 15.7 9.1 0.00 0.0
2005 23.0 18.2 0.00 0.0
2004 18.8 4.8 0.00 0.0
2003 22.0 16.4 0.00 0.0
2002 28.4 20.7 0.00 0.0
2001 19.6 15.6 0.38 0.0
2000 26.5 12.5 0.38 0.0
1999 23.5 12.9 2.89 0.0
1998 21.8 14.5 0.00 0.0
1997 11.9 9.8 0.56 0.0
1996 22.2 11.2 0.00 0.0
1995 14.7 10.0 0.28 0.0
1994 25.6 9.7 0.00 0.0
1993 13.5 1.2 0.00 0.0
1992 18.1 7.8 0.00 0.0
1991 13.7 0.6 0.00 0.0
1990 16.0 9.4 0.00 0.0
1989 24.7 13.9 0.00 0.0
1988 25.4 14.8 0.70 0.0
1987 13.5 11.1 0.47 0.0
1986 13.9 9.2 0.00 0.0
1985 30.6 16.0 0.00 0.0
1984 23.3 12.1 0.13 0.0
1983 32.0 14.5 0.00 0.0
1982 18.5 4.5 0.22 0.0
1981 10.0 7.0 0.00 0.0
1980 22.0 9.0 0.04 0.0
1979 14.0 0.0 0.02 0.0
1978 20.0 6.5 0.26 0.0
1977 8.0 6.5 1.02 0.0
1976 11.1 9.4 2.62 0.0
1975 18.9 15.0 1.40 0.0
1974 20.6 12.2 0.03 0.0
1973 12.2 4.4 0.03 0.0
1972 17.8 5.0 0.00 0.0
1971 20.6 13.3 0.15 0.0
1970 23.9 8.9 0.00 0.0
1969 17.8 0.0 0.00 0.0
1968 27.2 13.3 0.00 0.0
1967 28.3 9.4 0.58 0.0
1966 18.3 6.1 0.00 0.0
1965 29.4 13.9 0.00 0.0
1964 15.6 7.8 0.10 0.0
1963 10.0 5.0 0.00 0.0
1962 9.4 2.8 0.13 0.0
1961 25.6 9.4 0.00 0.0
1960 15.6 11.7 0.00 0.0
1959 21.1 1.7 0.86 0.0
1958 16.7 6.7 0.00 0.0
1957 22.8 16.7 2.34 0.0
1956 9.4 3.9 0.00 0.0
1955 21.7 15.6 0.00 0.0
1954 17.8 12.2 0.00 0.0
1953 22.8 15.0 2.01 0.0
1952 18.9 9.4 0.28 0.0
1951 20.6 8.9 0.00 0.0
1950 16.1 1.7 0.00 0.0
1949 12.8 8.3 0.00 0.0
1948 22.8 10.0 0.10 0.0
1947 16.1 2.8 0.00 0.0
1946 30.0 9.4 0.00 0.0
1945 13.9 9.4 0.69 0.0
1944 26.7 13.3 1.27 0.0
1943 21.7 1.7 0.00 0.0
1942 14.4 7.2 0.00 0.0
1941 26.1 1.1 0.00 0.0
1940 21.1 11.1 0.41 0.0
1939 17.2 5.6 0.00 0.0
1938 13.9 11.7 0.18 0.0
1937 12.8 6.7 0.00 0.0
1936 22.8 5.6 0.10 0.0
1935 20.6 11.7 0.05 0.0
1934 22.2 6.1 0.00 0.0
1933 18.9 11.7 0.38 0.0
1932 25.0 8.3 0.08 0.0
1931 10.0 7.8 1.04 0.0
1930 20.0 11.7 0.10 0.0
1929 11.1 -2.2 0.00 0.0
1928 16.1 8.3 0.28 0.0
1927 18.3 6.7 0.00 0.0
1926 23.9 13.9 0.00 0.0
1925 21.7 10.0 2.29 0.0
1924 21.1 8.3 0.00 0.0
1923 20.6 4.4 0.00 0.0
1922 21.1 11.7 0.00 0.0
1921 18.3 6.1 0.00 0.0
1920 15.0 1.7 0.00 0.0
1919 26.7 16.1 0.18 0.0
1918 11.1 6.7 0.94 0.0
1917 20.0 12.8 0.00 0.0
1916 21.1 3.9 0.10 0.0
1915 22.2 7.2 0.00 0.0
1914 30.0 8.3 0.00 0.0
1913 21.1 8.9 0.00 0.0
1912 15.6 8.9 0.69 0.0
1911 21.7 9.4 0.00 0.0
1910 21.7 2.8 0.00 0.0
1909 21.7 7.8 0.00 0.0
1908 21.7 4.4 0.00 0.0
1907 26.1 10.6 0.56 0.0
1906 28.3 11.1 0.00 0.0
1905 22.2 16.1 0.05 0.0
1904 15.6 5.0 0.13 0.0
1903 21.1 3.9 0.00 0.0
1902 20.6 12.2 0.00 0.0
1901 13.9 0.6 0.00 0.0
1900 17.2 8.3 1.52 0.0
1899 13.3 10.6 1.47 0.0
1898 12.2 6.1 0.00 0.0
1897 11.1 5.0 0.00 0.0
1896 14.4 3.3 0.05 0.0
1895 27.8 12.2 1.07 0.0
1894 18.9 15.0 1.32 0.0
1893 16.7 10.6 0.10 0.0
1892 17.2 3.9 0.00 0.0
1891 24.4 5.6 0.00 0.0
1890 20.6 7.8 0.15 0.0
What's the all-time high for Ottawa on 9/20?
For the date of Sep 20, the highest temperature ever reached in Ottawa history is 32.0 °C which happened in 1983.
Highest Temperatures in Ottawa on September 20
Rank Temperature Year
1 32.0 °C 1983
2 30.6 °C 1985
3 30.0 °C 1946
3 30.0 °C 1914
5 29.4 °C 1965
6 28.4 °C 2002
7 28.3 °C 1967
7 28.3 °C 1906
9 27.8 °C 1895
10 27.2 °C 1968
What's the all-time low for Ottawa on 9/20?
For the date of Sep 20, the lowest temperature ever reached in Ottawa history is -2.2 °C which happened in 1929.
Lowest Temperatures in Ottawa on September 20
Rank Temperature Year
1 -2.2 °C 1929
2 0.0 °C 1969
2 0.0 °C 1979
4 0.6 °C 1901
4 0.6 °C 1991
6 1.1 °C 1941
7 1.2 °C 1993
8 1.7 °C 1943
8 1.7 °C 1959
8 1.7 °C 1950
8 1.7 °C 1920
Lowest High Temperatures in Ottawa on September 20
Rank Temperature Year
1 8.0 °C 1977
2 9.4 °C 1962
2 9.4 °C 1956
4 10.0 °C 1981
4 10.0 °C 1931
4 10.0 °C 1963
7 11.1 °C 1929
7 11.1 °C 1918
7 11.1 °C 1976
7 11.1 °C 1897
What's the most it has ever rained in Ottawa on 9/20?
For the date of Sep 20, the most precipitation ever recorded in Ottawa history is 2.89 cm which happened in 1999.
All-Time Most Precipitation in Ottawa on September 20
Rank Precipitation Year
1 2.89 cm 1999
2 2.62 cm 1976
3 2.34 cm 1957
4 2.29 cm 1925
5 2.01 cm 1953
6 1.52 cm 1900
7 1.47 cm 1899
8 1.40 cm 1975
9 1.32 cm 1894
9 1.32 cm 2018
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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