Ottawa September 15 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of September 15.
September 15 All-Time Records
1889–2024
Highest temperature 32.2 °C 1939
Lowest temperature -1.1 °C 1913
Lowest daily high 10.6 °C 1956
Highest daily low 20.6 °C 1915
Most precipitation 3.33 cm 1957
Most snow none -
September 15 Average Weather
1991–2020 1
Average high 21.5 °C
Average low 10.6 °C
Chance precipitation 39.6%
Chance snow 0%
Ottawa September 15 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 26.0 5.5 0.00 0.0
2022 17.0 7.0 0.00 0.0
2021 20.0 17.0 0.00 0.0
2020 16.5 2.5 0.00 0.0
2019 17.0 11.0 0.00 0.0
2018 30.0 17.0 0.00 0.0
2017 27.0 12.5 0.00 0.0
2016 18.0 4.5 0.00 0.0
2015 27.4 11.7 0.00 0.0
2014 18.9 5.8 0.24 0.0
2013 19.0 8.5 0.64 0.0
2012 17.5 11.2 0.06 0.0
2011 15.5 9.4 0.00 0.0
2010 15.3 7.3 0.00 0.0
2009 15.7 10.9 0.00 0.0
2008 14.7 11.7 0.02 0.0
2007 13.5 10.0 0.06 0.0
2006 19.7 15.1 0.00 0.0
2005 24.7 15.9 0.02 0.0
2004 25.4 13.2 0.00 0.0
2003 26.2 20.0 0.86 0.0
2002 19.8 16.1 0.00 0.0
2001 20.3 3.8 0.00 0.0
2000 13.6 12.2 0.03 0.0
1999 23.1 8.8 0.00 0.0
1998 21.0 13.6 0.56 0.0
1997 22.9 11.5 0.00 0.0
1996 14.6 12.5 0.36 0.0
1995 15.5 3.9 0.00 0.0
1994 22.0 8.0 0.23 0.0
1993 13.4 10.5 0.26 0.0
1992 25.7 12.7 0.00 0.0
1991 21.9 12.5 0.42 0.0
1990 12.2 8.6 0.04 0.0
1989 20.3 8.9 0.00 0.0
1988 15.1 5.8 0.00 0.0
1987 21.8 8.4 0.00 0.0
1986 14.0 7.0 0.70 0.0
1985 21.3 8.2 0.00 0.0
1984 13.4 8.7 0.00 0.0
1983 19.5 5.0 0.00 0.0
1982 14.5 10.5 0.04 0.0
1981 17.5 7.5 0.00 0.0
1980 18.5 9.0 0.00 0.0
1979 17.5 9.0 0.02 0.0
1978 23.0 13.5 0.06 0.0
1977 19.5 4.5 0.08 0.0
1976 22.8 15.6 0.00 0.0
1975 19.4 6.7 0.03 0.0
1974 20.6 10.6 0.00 0.0
1973 20.6 7.8 0.05 0.0
1972 20.0 4.4 0.00 0.0
1971 25.6 17.2 0.05 0.0
1970 13.3 10.0 0.41 0.0
1969 25.6 15.0 0.25 0.0
1968 25.0 11.7 0.00 0.0
1967 26.1 8.3 0.00 0.0
1966 15.6 7.8 0.00 0.0
1965 21.1 11.7 1.57 0.0
1964 13.9 4.4 0.00 0.0
1963 21.1 4.4 0.00 0.0
1962 19.4 10.6 0.00 0.0
1961 14.4 11.1 0.00 0.0
1960 12.8 7.2 0.00 0.0
1959 11.1 5.0 0.00 0.0
1958 27.8 13.3 0.00 0.0
1957 21.1 8.9 3.33 0.0
1956 10.6 3.3 0.00 0.0
1955 20.0 15.6 0.00 0.0
1954 17.2 2.2 0.38 0.0
1953 15.0 1.1 1.24 0.0
1952 18.3 12.2 1.17 0.0
1951 22.8 12.8 0.25 0.0
1950 16.1 12.8 0.30 0.0
1949 18.3 10.0 0.00 0.0
1948 16.1 6.1 0.00 0.0
1947 28.3 11.7 1.22 0.0
1946 22.8 1.7 0.00 0.0
1945 21.1 12.8 0.00 0.0
1944 23.9 16.7 0.00 0.0
1943 23.3 7.8 0.30 0.0
1942 28.3 11.1 0.23 0.0
1941 30.6 12.2 0.00 0.0
1940 22.2 11.1 0.00 0.0
1939 32.2 16.7 0.00 0.0
1938 17.8 11.1 0.00 0.0
1937 16.1 8.9 0.74 0.0
1936 26.1 8.9 0.84 0.0
1935 12.8 6.7 0.00 0.0
1934 23.3 17.2 0.00 0.0
1933 20.6 3.9 0.00 0.0
1932 26.1 13.3 0.00 0.0
1931 25.6 18.3 1.85 0.0
1930 22.8 15.6 1.04 0.0
1929 19.4 10.0 0.00 0.0
1928 19.4 11.7 0.56 0.0
1927 17.8 9.4 1.73 0.0
1926 17.8 7.2 0.05 0.0
1925 20.6 7.2 0.00 0.0
1924 20.0 7.2 0.00 0.0
1923 13.3 4.4 0.00 0.0
1922 18.9 8.3 0.00 0.0
1921 20.0 11.7 0.00 0.0
1920 21.1 7.2 0.00 0.0
1919 16.1 4.4 0.00 0.0
1918 18.3 8.3 0.41 0.0
1917 19.4 12.2 0.00 0.0
1916 21.1 14.4 0.84 0.0
1915 31.7 20.6 0.13 0.0
1914 24.4 6.7 0.00 0.0
1913 16.7 -1.1 0.00 0.0
1912 22.2 13.3 0.25 0.0
1911 14.4 4.4 2.36 0.0
1910 20.0 5.0 0.00 0.0
1909 28.9 15.6 0.30 0.0
1908 21.7 5.6 0.00 0.0
1907 28.9 14.4 0.00 0.0
1906 20.0 5.0 0.00 0.0
1905 16.7 4.4 0.15 0.0
1904 14.4 8.3 0.56 0.0
1903 22.8 13.9 0.53 0.0
1902 21.1 2.8 0.00 0.0
1901 23.3 12.2 0.58 0.0
1900 18.3 4.4 0.00 0.0
1899 15.6 3.3 0.00 0.0
1898 25.6 9.4 0.00 0.0
1897 22.2 7.2 0.00 0.0
1896 18.9 10.0 0.08 0.0
1895 17.2 1.1 0.00 0.0
1894 26.7 15.0 0.00 0.0
1893 24.4 16.7 0.05 0.0
1892 18.9 9.4 0.00 0.0
1891 15.6 2.8 0.10 0.0
1890 22.2 7.2 0.00 0.0
What's the all-time high for Ottawa on 9/15?
For the date of Sep 15, the highest temperature ever reached in Ottawa history is 32.2 °C which happened in 1939.
Highest Temperatures in Ottawa on September 15
Rank Temperature Year
1 32.2 °C 1939
2 31.7 °C 1915
3 30.6 °C 1941
4 30.0 °C 2018
5 28.9 °C 1909
5 28.9 °C 1907
7 28.3 °C 1947
7 28.3 °C 1942
9 27.8 °C 1958
10 27.4 °C 2015
What's the all-time low for Ottawa on 9/15?
For the date of Sep 15, the lowest temperature ever reached in Ottawa history is -1.1 °C which happened in 1913.
Lowest Temperatures in Ottawa on September 15
Rank Temperature Year
1 -1.1 °C 1913
2 1.1 °C 1953
2 1.1 °C 1895
4 1.7 °C 1946
5 2.2 °C 1954
6 2.5 °C 2020
7 2.8 °C 1891
7 2.8 °C 1902
9 3.3 °C 1899
9 3.3 °C 1956
Lowest High Temperatures in Ottawa on September 15
Rank Temperature Year
1 10.6 °C 1956
2 11.1 °C 1959
3 12.2 °C 1990
4 12.8 °C 1960
4 12.8 °C 1935
6 13.3 °C 1970
6 13.3 °C 1923
8 13.4 °C 1984
8 13.4 °C 1993
10 13.5 °C 2007
What's the most it has ever rained in Ottawa on 9/15?
For the date of Sep 15, the most precipitation ever recorded in Ottawa history is 3.33 cm which happened in 1957.
All-Time Most Precipitation in Ottawa on September 15
Rank Precipitation Year
1 3.33 cm 1957
2 2.36 cm 1911
3 1.85 cm 1931
4 1.73 cm 1927
5 1.57 cm 1965
6 1.24 cm 1953
7 1.22 cm 1947
8 1.17 cm 1952
9 1.04 cm 1930
10 0.86 cm 2003
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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