Ottawa September 30 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of September 30.
September 30 All-Time Records
1889–2024
Highest temperature 28.3 °C 1922
Lowest temperature -3.3 °C 1951
Lowest daily high 6.7 °C 1932
Highest daily low 17.4 °C 1986
Most precipitation 3.48 cm 1924
Most snow none -
September 30 Average Weather
1991–2020 1
Average high 17.9 °C
Average low 7.6 °C
Chance precipitation 43.5%
Chance snow 0.1%
Ottawa September 30 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 25.0 10.5 0.00 0.0
2022 19.0 1.5 0.00 0.0
2021 17.0 7.0 0.00 0.0
2020 17.0 10.5 0.36 0.0
2019 16.0 6.0 0.60 0.0
2018 11.0 5.5 0.04 0.0
2017 14.5 7.5 0.00 0.0
2016 18.5 10.5 0.00 0.0
2015 15.0 10.4 0.00 0.0
2014 16.8 8.5 0.00 0.0
2013 24.1 8.2 0.00 0.0
2012 13.6 9.8 1.87 0.0
2011 20.5 12.2 0.38 0.0
2010 15.9 11.1 1.50 0.0
2009 9.0 4.4 0.07 0.0
2008 16.4 9.8 0.82 0.0
2007 18.7 5.9 0.00 0.0
2006 16.5 0.1 0.82 0.0
2005 15.8 2.5 0.00 0.0
2004 18.7 3.9 0.00 0.0
2003 15.8 4.5 0.18 0.0
2002 19.1 7.8 1.40 0.0
2001 19.0 3.2 0.00 0.0
2000 20.1 3.2 0.00 0.0
1999 12.0 9.8 0.16 0.0
1998 19.7 13.3 1.06 0.0
1997 15.9 11.4 0.16 0.0
1996 13.3 5.7 0.00 0.0
1995 22.2 4.6 0.00 0.0
1994 12.0 5.8 0.00 0.0
1993 8.7 3.2 0.00 0.0
1992 6.9 1.3 0.00 0.0
1991 9.9 -2.0 0.32 0.0
1990 11.0 9.3 0.66 0.0
1989 16.8 0.9 0.00 0.0
1988 21.4 5.3 0.00 0.0
1987 16.5 10.8 0.58 0.0
1986 23.8 17.4 0.04 0.0
1985 23.1 7.7 1.82 0.0
1984 14.6 0.9 0.00 0.0
1983 25.0 5.5 0.00 0.0
1982 22.5 9.0 0.00 0.0
1981 10.0 -0.5 0.00 0.0
1980 19.0 11.0 0.02 0.0
1979 21.5 11.5 0.00 0.0
1978 19.0 8.0 1.00 0.0
1977 10.5 8.0 0.58 0.0
1976 14.4 6.1 0.00 0.0
1975 21.1 7.2 0.00 0.0
1974 11.1 5.0 0.00 0.0
1973 16.7 4.4 0.00 0.0
1972 7.2 3.9 1.04 0.0
1971 20.0 10.0 0.00 0.0
1970 10.0 6.7 1.27 0.0
1969 16.7 2.8 0.00 0.0
1968 21.1 5.6 0.00 0.0
1967 13.3 11.1 0.00 0.0
1966 11.7 8.9 0.00 0.0
1965 16.7 1.1 0.71 0.0
1964 13.9 3.3 0.00 0.0
1963 12.8 3.9 0.00 0.0
1962 12.8 8.3 0.00 0.0
1961 20.6 1.1 0.00 0.0
1960 15.6 11.1 0.76 0.0
1959 18.3 12.8 1.63 0.0
1958 18.3 6.7 1.12 0.0
1957 21.7 0.0 0.00 0.0
1956 16.7 6.1 0.15 0.0
1955 21.1 13.3 0.15 0.0
1954 22.2 11.1 0.13 0.0
1953 25.0 6.1 0.00 0.0
1952 18.9 7.2 0.00 0.0
1951 7.8 -3.3 0.00 0.0
1950 25.6 8.9 0.00 0.0
1949 16.7 2.2 0.00 0.0
1948 25.6 11.1 0.00 0.0
1947 7.8 1.7 0.00 0.0
1946 10.6 6.7 0.20 0.0
1945 n/a n/a 0.33 0.0
1944 16.7 -0.6 0.00 0.0
1943 18.3 5.6 0.00 0.0
1942 15.6 4.4 0.00 0.0
1941 13.9 -2.2 1.24 0.0
1940 16.7 2.2 0.00 0.0
1939 10.6 7.2 0.36 0.0
1938 12.8 1.7 0.00 0.0
1937 17.8 1.7 0.38 0.0
1936 12.8 -1.7 0.79 0.0
1935 12.2 0.6 0.10 0.0
1934 12.8 7.8 0.00 0.0
1933 21.7 4.4 0.00 0.0
1932 6.7 -1.7 0.00 0.0
1931 23.3 6.7 0.00 0.0
1930 12.8 6.1 0.10 0.0
1929 13.9 3.3 0.00 0.0
1928 14.4 0.6 0.00 0.0
1927 25.6 14.4 0.53 0.0
1926 15.6 7.2 0.00 0.0
1925 11.1 0.6 0.00 0.0
1924 12.8 7.8 3.48 0.0
1923 16.1 3.9 0.00 0.0
1922 28.3 8.9 0.00 0.0
1921 26.1 15.6 0.38 0.0
1920 13.3 7.2 0.86 0.0
1919 20.0 6.1 0.00 0.0
1918 12.8 -1.1 0.00 0.0
1917 13.9 10.0 1.63 0.0
1916 10.0 2.8 0.15 0.0
1915 16.1 1.7 0.00 0.0
1914 14.4 5.6 0.13 0.0
1913 12.8 1.1 0.00 0.0
1912 10.0 -2.2 0.00 0.0
1911 12.2 -0.6 0.00 0.0
1910 22.2 2.8 0.00 0.0
1909 15.6 9.4 0.51 0.0
1908 16.7 1.1 0.00 0.0
1907 13.9 3.3 0.13 0.0
1906 17.8 6.7 0.05 0.0
1905 25.0 8.3 0.00 0.0
1904 21.7 12.2 0.00 0.0
1903 21.1 1.1 0.00 0.0
1902 18.9 13.3 0.00 0.0
1901 18.9 10.6 0.18 0.0
1900 18.9 8.9 0.00 0.0
1899 8.9 1.1 0.05 0.0
1898 27.8 10.0 0.15 0.0
1897 26.7 5.0 0.00 0.0
1896 18.3 12.8 2.64 0.0
1895 9.4 2.8 0.18 0.0
1894 22.8 8.3 0.51 0.0
1893 16.1 3.3 0.00 0.0
1892 24.4 3.9 0.00 0.0
1891 15.6 4.4 0.00 0.0
1890 21.7 3.9 0.00 0.0
What's the all-time high for Ottawa on 9/30?
For the date of Sep 30, the highest temperature ever reached in Ottawa history is 28.3 °C which happened in 1922.
Highest Temperatures in Ottawa on September 30
Rank Temperature Year
1 28.3 °C 1922
2 27.8 °C 1898
3 26.7 °C 1897
4 26.1 °C 1921
5 25.6 °C 1950
5 25.6 °C 1948
5 25.6 °C 1927
8 25.0 °C 2023
8 25.0 °C 1905
8 25.0 °C 1953
8 25.0 °C 1983
What's the all-time low for Ottawa on 9/30?
For the date of Sep 30, the lowest temperature ever reached in Ottawa history is -3.3 °C which happened in 1951.
Lowest Temperatures in Ottawa on September 30
Rank Temperature Year
1 -3.3 °C 1951
2 -2.2 °C 1941
2 -2.2 °C 1912
4 -2.0 °C 1991
5 -1.7 °C 1932
5 -1.7 °C 1936
7 -1.1 °C 1918
8 -0.6 °C 1944
8 -0.6 °C 1911
10 -0.5 °C 1981
Lowest High Temperatures in Ottawa on September 30
Rank Temperature Year
1 6.7 °C 1932
2 6.9 °C 1992
3 7.2 °C 1972
4 7.8 °C 1951
4 7.8 °C 1947
6 8.7 °C 1993
7 8.9 °C 1899
8 9.0 °C 2009
9 9.4 °C 1895
10 9.9 °C 1991
What's the most it has ever rained in Ottawa on 9/30?
For the date of Sep 30, the most precipitation ever recorded in Ottawa history is 3.48 cm which happened in 1924.
All-Time Most Precipitation in Ottawa on September 30
Rank Precipitation Year
1 3.48 cm 1924
2 2.64 cm 1896
3 1.87 cm 2012
4 1.82 cm 1985
5 1.63 cm 1917
5 1.63 cm 1959
7 1.50 cm 2010
8 1.40 cm 2002
9 1.27 cm 1970
10 1.24 cm 1941
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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