Ottawa August 21 Weather Records

Daily averages and all-time records for weather in Ottawa, Ontario for the date of August 21.
August 21 All-Time Records
1889–2024
Highest temperature 35.6 °C 1916
Lowest temperature 5.0 °C 1940
Lowest daily high 14.4 °C 1936
Highest daily low 22.2 °C 1916
Most precipitation 4.29 cm 1890
Most snow none -
August 21 Average Weather
1991–2020 1
Average high 25.3 °C
Average low 14.3 °C
Chance precipitation 36.1%
Chance snow 0%
Ottawa August 21 Weather by Year
Year High (°C) Low (°C) Precip. (cm) Snow (cm)
2023 22.5 15.0 0.00 0.0
2022 26.5 18.0 0.12 0.0
2021 33.5 19.0 0.00 0.0
2020 23.5 16.5 0.00 0.0
2019 28.5 17.5 0.00 0.0
2018 24.0 15.0 3.30 0.0
2017 28.0 16.5 0.96 0.0
2016 24.5 20.5 1.10 0.0
2015 24.8 16.2 0.00 0.0
2014 24.0 18.0 1.50 0.0
2013 30.5 17.0 0.30 0.0
2012 24.0 11.9 0.02 0.0
2011 22.0 17.8 0.96 0.0
2010 18.5 10.5 0.32 0.0
2009 26.3 19.2 0.54 0.0
2008 27.1 10.0 0.00 0.0
2007 23.2 7.2 0.00 0.0
2006 24.6 12.5 0.00 0.0
2005 27.6 18.8 0.00 0.0
2004 20.4 11.7 0.00 0.0
2003 29.8 16.4 0.00 0.0
2002 27.2 9.8 0.18 0.0
2001 26.5 17.5 0.00 0.0
2000 23.1 11.2 0.00 0.0
1999 23.8 15.3 0.66 0.0
1998 25.9 16.0 0.46 0.0
1997 18.2 13.8 2.20 0.0
1996 27.3 21.0 0.00 0.0
1995 31.0 18.4 0.00 0.0
1994 25.1 18.5 0.02 0.0
1993 19.6 9.9 0.00 0.0
1992 24.9 7.0 0.00 0.0
1991 18.2 15.5 0.44 0.0
1990 23.8 11.9 0.00 0.0
1989 25.8 19.2 0.04 0.0
1988 16.7 11.4 0.00 0.0
1987 27.4 10.2 0.14 0.0
1986 23.1 15.8 2.01 0.0
1985 23.8 11.7 0.00 0.0
1984 26.5 8.7 0.00 0.0
1983 24.0 12.0 0.64 0.0
1982 15.5 6.0 0.00 0.0
1981 28.5 12.5 0.00 0.0
1980 25.5 14.0 0.00 0.0
1979 24.5 13.5 0.00 0.0
1978 24.5 10.0 0.00 0.0
1977 22.5 6.0 1.88 0.0
1976 31.7 17.8 0.00 0.0
1975 23.3 7.2 0.08 0.0
1974 31.7 13.9 0.00 0.0
1973 25.0 17.2 1.07 0.0
1972 26.7 11.7 0.00 0.0
1971 23.9 13.3 0.10 0.0
1970 22.8 10.0 0.00 0.0
1969 21.7 9.4 0.00 0.0
1968 22.8 17.8 0.00 0.0
1967 25.6 10.0 0.89 0.0
1966 23.3 10.6 0.00 0.0
1965 22.8 7.8 0.00 0.0
1964 19.4 7.8 0.10 0.0
1963 30.0 12.2 0.00 0.0
1962 23.3 15.6 0.20 0.0
1961 18.9 13.3 0.48 0.0
1960 26.1 16.7 0.91 0.0
1959 31.1 16.7 0.05 0.0
1958 22.8 17.2 0.86 0.0
1957 22.2 8.3 0.00 0.0
1956 18.9 9.4 0.00 0.0
1955 32.2 20.6 0.00 0.0
1954 25.6 9.4 0.00 0.0
1953 23.9 7.2 0.00 0.0
1952 22.2 16.7 1.88 0.0
1951 23.9 15.6 0.20 0.0
1950 20.6 5.6 0.00 0.0
1949 27.8 11.7 0.00 0.0
1948 28.3 12.2 0.00 0.0
1947 23.9 16.1 0.00 0.0
1946 25.0 11.7 1.17 0.0
1945 25.0 15.0 0.08 0.0
1944 26.7 16.7 0.51 0.0
1943 26.1 13.9 0.00 0.0
1942 30.0 13.9 0.00 0.0
1941 22.2 5.6 0.25 0.0
1940 19.4 5.0 0.00 0.0
1939 28.3 17.2 0.00 0.0
1938 28.9 16.1 0.25 0.0
1937 25.6 17.8 0.00 0.0
1936 14.4 8.3 0.51 0.0
1935 25.0 18.9 0.56 0.0
1934 22.2 6.7 0.00 0.0
1933 26.1 7.2 0.00 0.0
1932 26.7 11.7 0.00 0.0
1931 26.7 6.7 0.00 0.0
1930 25.0 10.0 0.00 0.0
1929 25.6 8.9 0.00 0.0
1928 27.2 14.4 0.94 0.0
1927 25.0 13.3 0.00 0.0
1926 20.6 8.9 0.00 0.0
1925 20.0 8.9 0.00 0.0
1924 23.9 11.1 0.03 0.0
1923 17.8 11.7 2.44 0.0
1922 23.9 7.8 0.00 0.0
1921 21.7 9.4 0.00 0.0
1920 29.4 16.1 0.00 0.0
1919 30.0 13.3 0.81 0.0
1918 29.4 10.0 0.00 0.0
1917 20.0 9.4 0.00 0.0
1916 35.6 22.2 0.00 0.0
1915 23.9 12.8 0.64 0.0
1914 26.7 15.0 0.79 0.0
1913 26.1 11.1 0.00 0.0
1912 22.8 10.6 0.30 0.0
1911 28.9 8.9 0.00 0.0
1910 26.7 10.0 0.00 0.0
1909 20.6 8.3 0.00 0.0
1908 26.7 11.1 0.00 0.0
1907 22.2 7.8 0.00 0.0
1906 31.7 17.2 0.00 0.0
1905 27.8 11.7 0.00 0.0
1904 26.7 11.1 0.03 0.0
1903 22.8 8.3 0.00 0.0
1902 24.4 12.8 2.74 0.0
1901 30.0 15.6 0.00 0.0
1900 23.9 9.4 0.00 0.0
1899 31.7 16.7 0.00 0.0
1898 26.1 15.0 0.00 0.0
1897 23.3 7.2 0.00 0.0
1896 23.3 7.8 0.23 0.0
1895 16.7 8.9 0.00 0.0
1894 16.7 5.6 0.00 0.0
1893 23.9 15.0 2.77 0.0
1892 25.6 10.0 0.00 0.0
1891 23.9 20.6 0.30 0.0
1890 20.6 8.3 4.29 0.0
What's the all-time high for Ottawa on 8/21?
For the date of Aug 21, the highest temperature ever reached in Ottawa history is 35.6 °C which happened in 1916.
Highest Temperatures in Ottawa on August 21
Rank Temperature Year
1 35.6 °C 1916
2 33.5 °C 2021
3 32.2 °C 1955
4 31.7 °C 1974
4 31.7 °C 1906
4 31.7 °C 1899
4 31.7 °C 1976
8 31.1 °C 1959
9 31.0 °C 1995
10 30.5 °C 2013
What's the all-time low for Ottawa on 8/21?
For the date of Aug 21, the lowest temperature ever reached in Ottawa history is 5.0 °C which happened in 1940.
Lowest Temperatures in Ottawa on August 21
Rank Temperature Year
1 5.0 °C 1940
2 5.6 °C 1950
2 5.6 °C 1894
2 5.6 °C 1941
5 6.0 °C 1982
5 6.0 °C 1977
7 6.7 °C 1934
7 6.7 °C 1931
9 7.0 °C 1992
10 7.2 °C 1933
10 7.2 °C 1953
10 7.2 °C 1897
10 7.2 °C 1975
10 7.2 °C 2007
Lowest High Temperatures in Ottawa on August 21
Rank Temperature Year
1 14.4 °C 1936
2 15.5 °C 1982
3 16.7 °C 1894
3 16.7 °C 1988
3 16.7 °C 1895
6 17.8 °C 1923
7 18.2 °C 1991
7 18.2 °C 1997
9 18.5 °C 2010
10 18.9 °C 1961
10 18.9 °C 1956
What's the most it has ever rained in Ottawa on 8/21?
For the date of Aug 21, the most precipitation ever recorded in Ottawa history is 4.29 cm which happened in 1890.
All-Time Most Precipitation in Ottawa on August 21
Rank Precipitation Year
1 4.29 cm 1890
2 3.30 cm 2018
3 2.77 cm 1893
4 2.74 cm 1902
5 2.44 cm 1923
6 2.20 cm 1997
7 2.01 cm 1986
8 1.88 cm 1952
8 1.88 cm 1977
10 1.50 cm 2014
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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