Ottawa August 18 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of August 18.
August 18 All-Time Records
1889–2024
Highest temperature 35.6 °C 1906
Lowest temperature 3.3 °C 1941
Lowest daily high 13.9 °C 1958
Highest daily low 22.6 °C 2002
Most precipitation 5.11 cm 1969
Most snow none -
August 18 Average Weather
1991–2020 1
Average high 25.5 °C
Average low 14.5 °C
Chance precipitation 35.6%
Chance snow 0%
Ottawa August 18 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 23.0 18.0 0.22 0.0
2022 27.0 17.0 0.00 0.0
2021 30.0 21.0 0.00 0.0
2020 23.0 14.0 0.24 0.0
2019 27.0 15.5 0.24 0.0
2018 25.0 15.5 0.00 0.0
2017 23.0 16.0 0.34 0.0
2016 27.0 18.0 0.06 0.0
2015 31.5 19.5 0.03 0.0
2014 21.0 9.9 0.00 0.0
2013 28.0 12.5 0.00 0.0
2012 22.5 13.5 0.00 0.0
2011 29.0 17.2 0.94 0.0
2010 23.7 13.1 0.00 0.0
2009 28.5 20.1 0.28 0.0
2008 29.4 14.2 1.64 0.0
2007 18.7 11.5 0.00 0.0
2006 29.6 14.5 0.00 0.0
2005 20.0 9.7 0.00 0.0
2004 26.1 17.0 0.54 0.0
2003 27.7 15.8 0.00 0.0
2002 30.9 22.6 0.00 0.0
2001 27.6 18.0 0.00 0.0
2000 21.3 8.8 0.00 0.0
1999 25.0 17.2 0.00 0.0
1998 17.3 13.0 0.00 0.0
1997 22.7 10.3 0.00 0.0
1996 26.0 16.4 0.04 0.0
1995 28.8 19.8 0.00 0.0
1994 25.9 14.6 0.00 0.0
1993 26.9 18.0 0.00 0.0
1992 24.5 11.6 0.02 0.0
1991 23.9 17.9 0.00 0.0
1990 29.3 20.0 2.12 0.0
1989 25.0 9.0 0.00 0.0
1988 19.6 10.9 0.00 0.0
1987 26.2 17.8 0.00 0.0
1986 25.8 17.8 0.00 0.0
1985 29.8 12.9 0.56 0.0
1984 22.6 7.7 0.07 0.0
1983 27.0 18.5 0.00 0.0
1982 26.0 9.0 0.00 0.0
1981 24.5 8.0 0.00 0.0
1980 26.0 14.0 0.02 0.0
1979 17.0 13.5 0.82 0.0
1978 25.5 16.5 0.04 0.0
1977 18.0 12.0 0.04 0.0
1976 25.6 9.4 0.00 0.0
1975 23.9 14.4 0.00 0.0
1974 27.8 15.6 0.64 0.0
1973 29.4 18.9 0.56 0.0
1972 22.8 15.6 0.00 0.0
1971 28.3 13.9 0.00 0.0
1970 24.4 11.1 0.00 0.0
1969 30.0 19.4 5.11 0.0
1968 19.4 7.8 0.00 0.0
1967 27.2 18.3 2.54 0.0
1966 29.4 14.4 0.00 0.0
1965 27.2 17.8 0.20 0.0
1964 21.1 10.6 0.00 0.0
1963 22.2 11.1 0.00 0.0
1962 20.6 10.0 0.00 0.0
1961 26.1 9.4 0.00 0.0
1960 31.1 11.1 0.00 0.0
1959 25.6 20.0 0.00 0.0
1958 13.9 7.2 0.18 0.0
1957 25.6 7.2 0.00 0.0
1956 26.7 17.8 0.00 0.0
1955 31.7 20.0 0.00 0.0
1954 25.0 12.8 0.00 0.0
1953 20.6 8.9 0.00 0.0
1952 22.8 10.0 0.00 0.0
1951 22.8 7.8 0.00 0.0
1950 20.0 12.8 0.64 0.0
1949 23.9 17.8 0.00 0.0
1948 27.2 15.0 1.75 0.0
1947 28.9 17.2 0.69 0.0
1946 22.8 9.4 0.05 0.0
1945 22.8 13.9 0.00 0.0
1944 23.3 14.4 0.00 0.0
1943 18.9 12.8 0.00 0.0
1942 26.1 10.6 0.00 0.0
1941 22.2 3.3 0.18 0.0
1940 32.2 17.8 1.98 0.0
1939 26.7 12.2 0.00 0.0
1938 26.1 16.1 0.00 0.0
1937 25.6 15.6 0.00 0.0
1936 23.9 8.9 0.00 0.0
1935 33.3 16.7 0.00 0.0
1934 31.7 17.2 0.00 0.0
1933 27.8 18.3 0.18 0.0
1932 25.0 18.9 2.44 0.0
1931 31.7 12.2 0.00 0.0
1930 22.2 10.6 0.30 0.0
1929 20.6 16.1 0.13 0.0
1928 23.9 18.9 0.28 0.0
1927 20.0 8.9 0.00 0.0
1926 20.6 6.7 0.00 0.0
1925 32.2 14.4 0.00 0.0
1924 18.9 5.6 0.00 0.0
1923 26.1 13.3 0.00 0.0
1922 31.1 16.7 2.08 0.0
1921 23.3 16.7 1.40 0.0
1920 24.4 11.7 0.00 0.0
1919 19.4 16.1 0.15 0.0
1918 21.1 6.7 0.00 0.0
1917 24.4 10.6 0.00 0.0
1916 33.9 18.3 0.00 0.0
1915 20.6 7.8 0.00 0.0
1914 25.0 16.1 0.38 0.0
1913 28.9 18.9 0.00 0.0
1912 23.9 11.7 0.00 0.0
1911 25.0 11.7 0.05 0.0
1910 22.8 15.6 2.46 0.0
1909 25.6 20.0 0.00 0.0
1908 25.0 13.9 0.00 0.0
1907 23.3 8.9 0.00 0.0
1906 35.6 17.2 0.00 0.0
1905 25.6 8.9 0.00 0.0
1904 23.9 11.1 0.00 0.0
1903 22.2 10.0 0.94 0.0
1902 22.2 8.9 0.00 0.0
1901 26.1 13.9 0.00 0.0
1900 27.2 12.2 0.43 0.0
1899 33.3 13.9 0.00 0.0
1898 21.7 13.3 0.00 0.0
1897 21.7 8.9 0.41 0.0
1896 17.2 10.6 0.08 0.0
1895 25.6 12.2 0.58 0.0
1894 22.8 11.1 0.03 0.0
1893 19.4 16.1 2.67 0.0
1892 31.1 16.7 0.00 0.0
1891 25.0 17.2 0.00 0.0
1890 20.6 8.9 0.00 0.0
What's the all-time high for Ottawa on 8/18?
For the date of Aug 18, the highest temperature ever reached in Ottawa history is 35.6 °C which happened in 1906.
Highest Temperatures in Ottawa on August 18
Rank Temperature Year
1 35.6 °C 1906
2 33.9 °C 1916
3 33.3 °C 1899
3 33.3 °C 1935
5 32.2 °C 1925
5 32.2 °C 1940
7 31.7 °C 1931
7 31.7 °C 1955
7 31.7 °C 1934
10 31.5 °C 2015
What's the all-time low for Ottawa on 8/18?
For the date of Aug 18, the lowest temperature ever reached in Ottawa history is 3.3 °C which happened in 1941.
Lowest Temperatures in Ottawa on August 18
Rank Temperature Year
1 3.3 °C 1941
2 5.6 °C 1924
3 6.7 °C 1918
3 6.7 °C 1926
5 7.2 °C 1957
5 7.2 °C 1958
7 7.7 °C 1984
8 7.8 °C 1951
8 7.8 °C 1968
8 7.8 °C 1915
Lowest High Temperatures in Ottawa on August 18
Rank Temperature Year
1 13.9 °C 1958
2 17.0 °C 1979
3 17.2 °C 1896
4 17.3 °C 1998
5 18.0 °C 1977
6 18.7 °C 2007
7 18.9 °C 1943
7 18.9 °C 1924
9 19.4 °C 1893
9 19.4 °C 1968
9 19.4 °C 1919
What's the most it has ever rained in Ottawa on 8/18?
For the date of Aug 18, the most precipitation ever recorded in Ottawa history is 5.11 cm which happened in 1969.
All-Time Most Precipitation in Ottawa on August 18
Rank Precipitation Year
1 5.11 cm 1969
2 2.67 cm 1893
3 2.54 cm 1967
4 2.46 cm 1910
5 2.44 cm 1932
6 2.12 cm 1990
7 2.08 cm 1922
8 1.98 cm 1940
9 1.75 cm 1948
10 1.64 cm 2008
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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