Ottawa September 12 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of September 12.
September 12 All-Time Records
1889–2024
Highest temperature 33.3 °C 1906
Lowest temperature 1.7 °C 1967
Lowest daily high 12.2 °C 1937
Highest daily low 22.2 °C 1947
Most precipitation 5.49 cm 1963
Most snow none -
September 12 Average Weather
1991–2020 1
Average high 22.1 °C
Average low 11.1 °C
Chance precipitation 37.9%
Chance snow 0%
Ottawa September 12 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 25.5 12.0 0.40 0.0
2022 25.0 14.0 0.06 0.0
2021 23.0 18.0 0.00 0.0
2020 21.0 5.0 0.14 0.0
2019 19.5 10.5 0.00 0.0
2018 24.0 10.0 0.00 0.0
2017 25.5 9.0 0.00 0.0
2016 24.0 7.5 0.00 0.0
2015 15.5 12.0 3.98 0.0
2014 14.0 6.8 0.00 0.0
2013 24.5 19.4 1.62 0.0
2012 27.1 9.4 0.00 0.0
2011 27.8 13.5 0.06 0.0
2010 17.6 11.9 0.31 0.0
2009 25.0 7.3 0.00 0.0
2008 20.1 11.0 0.61 0.0
2007 18.7 11.8 0.00 0.0
2006 20.0 5.8 0.00 0.0
2005 31.3 15.8 0.00 0.0
2004 23.2 12.0 0.00 0.0
2003 27.5 16.7 0.00 0.0
2002 21.2 6.9 0.00 0.0
2001 24.8 8.3 0.88 0.0
2000 26.0 18.2 0.00 0.0
1999 23.7 9.3 0.00 0.0
1998 21.2 16.4 0.00 0.0
1997 24.1 17.2 0.04 0.0
1996 20.2 16.8 0.76 0.0
1995 25.1 6.0 0.00 0.0
1994 20.8 10.6 0.00 0.0
1993 20.7 4.4 0.07 0.0
1992 17.2 2.4 0.00 0.0
1991 18.9 4.9 0.00 0.0
1990 26.2 6.7 0.00 0.0
1989 24.7 10.1 0.00 0.0
1988 19.7 7.2 0.04 0.0
1987 19.4 17.6 4.84 0.0
1986 22.2 15.6 0.04 0.0
1985 12.6 2.6 0.03 0.0
1984 18.0 8.9 0.14 0.0
1983 21.5 10.0 0.00 0.0
1982 28.5 13.0 0.00 0.0
1981 21.5 9.5 0.00 0.0
1980 16.0 4.5 0.00 0.0
1979 19.0 6.0 0.00 0.0
1978 16.0 9.5 0.00 0.0
1977 17.5 3.5 1.68 0.0
1976 22.2 6.7 0.05 0.0
1975 16.1 11.1 0.00 0.0
1974 22.8 16.7 0.33 0.0
1973 17.8 8.9 0.05 0.0
1972 20.6 13.3 0.00 0.0
1971 22.2 18.3 0.43 0.0
1970 23.3 6.1 0.10 0.0
1969 23.3 6.7 0.00 0.0
1968 18.9 11.1 0.00 0.0
1967 21.7 1.7 0.00 0.0
1966 21.1 5.0 0.00 0.0
1965 19.4 4.4 0.00 0.0
1964 13.9 3.3 0.00 0.0
1963 16.1 8.3 5.49 0.0
1962 21.1 12.8 0.00 0.0
1961 20.0 16.1 0.00 0.0
1960 16.7 8.9 1.27 0.0
1959 20.6 4.4 0.00 0.0
1958 18.3 3.3 0.05 0.0
1957 26.1 13.3 0.25 0.0
1956 21.1 12.8 0.05 0.0
1955 16.7 6.7 0.00 0.0
1954 13.3 3.9 0.05 0.0
1953 22.8 10.0 1.14 0.0
1952 26.1 16.7 0.00 0.0
1951 29.4 13.9 0.00 0.0
1950 17.2 8.3 0.00 0.0
1949 22.8 10.6 0.00 0.0
1948 23.3 13.3 0.00 0.0
1947 26.1 22.2 0.23 0.0
1946 13.3 3.3 0.00 0.0
1945 18.3 10.0 0.00 0.0
1944 26.1 12.2 1.19 0.0
1943 12.8 6.1 0.00 0.0
1942 22.2 10.0 0.10 0.0
1941 16.7 5.0 0.00 0.0
1940 16.1 3.9 0.00 0.0
1939 17.8 4.4 0.00 0.0
1938 16.7 11.1 0.51 0.0
1937 12.2 8.9 0.00 0.0
1936 24.4 14.4 0.03 0.0
1935 18.9 8.9 0.00 0.0
1934 23.9 12.2 2.92 0.0
1933 17.8 1.7 0.00 0.0
1932 27.2 11.7 0.00 0.0
1931 28.3 15.0 0.00 0.0
1930 15.6 12.2 0.08 0.0
1929 23.9 6.1 0.00 0.0
1928 12.2 10.0 1.17 0.0
1927 23.3 3.3 0.00 0.0
1926 20.0 11.7 0.10 0.0
1925 22.2 17.2 1.98 0.0
1924 15.6 4.4 0.15 0.0
1923 17.2 11.1 0.10 0.0
1922 17.8 12.8 1.85 0.0
1921 27.8 15.6 0.03 0.0
1920 21.7 15.6 0.71 0.0
1919 18.3 10.6 0.00 0.0
1918 17.2 7.2 0.81 0.0
1917 22.8 6.7 0.00 0.0
1916 25.6 12.2 0.00 0.0
1915 18.3 8.9 0.20 0.0
1914 20.0 4.4 0.00 0.0
1913 16.1 7.2 0.00 0.0
1912 15.6 7.2 0.00 0.0
1911 18.3 11.1 0.28 0.0
1910 24.4 12.2 0.13 0.0
1909 20.0 6.7 0.00 0.0
1908 27.2 10.0 0.00 0.0
1907 21.1 12.2 0.15 0.0
1906 33.3 16.7 0.00 0.0
1905 22.2 11.1 0.00 0.0
1904 21.7 11.1 0.18 0.0
1903 25.6 8.3 0.00 0.0
1902 21.1 13.3 0.00 0.0
1901 15.6 9.4 0.71 0.0
1900 21.7 8.9 0.20 0.0
1899 21.1 13.3 1.35 0.0
1898 16.7 5.6 0.00 0.0
1897 21.1 6.1 0.00 0.0
1896 24.4 13.9 0.00 0.0
1895 21.1 12.2 0.00 0.0
1894 20.0 6.7 0.00 0.0
1893 23.3 5.6 0.00 0.0
1892 23.3 10.6 0.00 0.0
1891 25.6 10.0 0.00 0.0
1890 18.9 12.2 1.19 0.0
What's the all-time high for Ottawa on 9/12?
For the date of Sep 12, the highest temperature ever reached in Ottawa history is 33.3 °C which happened in 1906.
Highest Temperatures in Ottawa on September 12
Rank Temperature Year
1 33.3 °C 1906
2 31.3 °C 2005
3 29.4 °C 1951
4 28.5 °C 1982
5 28.3 °C 1931
6 27.8 °C 2011
6 27.8 °C 1921
8 27.5 °C 2003
9 27.2 °C 1932
9 27.2 °C 1908
What's the all-time low for Ottawa on 9/12?
For the date of Sep 12, the lowest temperature ever reached in Ottawa history is 1.7 °C which has happened 2 times, most recently in 1967.
Lowest Temperatures in Ottawa on September 12
Rank Temperature Year
1 1.7 °C 1933
1 1.7 °C 1967
3 2.4 °C 1992
4 2.6 °C 1985
5 3.3 °C 1964
5 3.3 °C 1946
5 3.3 °C 1958
5 3.3 °C 1927
9 3.5 °C 1977
10 3.9 °C 1954
10 3.9 °C 1940
Lowest High Temperatures in Ottawa on September 12
Rank Temperature Year
1 12.2 °C 1928
1 12.2 °C 1937
3 12.6 °C 1985
4 12.8 °C 1943
5 13.3 °C 1946
5 13.3 °C 1954
7 13.9 °C 1964
8 14.0 °C 2014
9 15.5 °C 2015
10 15.6 °C 1901
10 15.6 °C 1912
10 15.6 °C 1924
10 15.6 °C 1930
What's the most it has ever rained in Ottawa on 9/12?
For the date of Sep 12, the most precipitation ever recorded in Ottawa history is 5.49 cm which happened in 1963.
All-Time Most Precipitation in Ottawa on September 12
Rank Precipitation Year
1 5.49 cm 1963
2 4.84 cm 1987
3 3.98 cm 2015
4 2.92 cm 1934
5 1.98 cm 1925
6 1.85 cm 1922
7 1.68 cm 1977
8 1.62 cm 2013
9 1.35 cm 1899
10 1.27 cm 1960
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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