Every 1 to 9 October in Portland Downtown, OR from 1872 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.
| Year | Mean, °F | Rank | High, °F | Rank | Low, °F | Rank | Precipitation, in | Rank | Days missing |
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| 2026 | 65.3 | 6 | 75.4 | 8 | 55.2 | 6 | 0.04 | 126 | 0 |
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| 2025 | 59.4 | 58 | 67.6 | 63 | 51.3 | 50 | 0.31 | 94 | 0 |
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| 2024 | 60.3 | 47 | 70.7 | 37 | 49.9 | 76 | 0.29 | 95 | 0 |
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| 2023 | 63.4 | 15 | 72.7 | 21 | 54.1 | 12 | 0.28 | 96 | 0 |
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| 2022 | 67.2 | 2 | 78.6 | 3 | 55.9 | 3 | 0.00 | 140 | 0 |
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| 2021 | 55.2 | 119 | 63.4 | 111 | 47 | 126 | 0.62 | 66 | 0 |
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| 2020 | 64.4 | 9 | 73.4 | 16 | 55.4 | 5 | 0.00 | 140 | 0 |
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| 2019 | 53.7 | 136 | 62.9 | 119 | 44.6 | 141 | 0.19 | 108 | 0 |
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| 2018 | 56.2 | 107 | 62.4 | 123 | 49.9 | 76 | 1.05 | 42 | 0 |
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| 2017 | 57.1 | 93 | 66.6 | 79 | 47.6 | 118 | 0.27 | 98 | 0 |
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| 2016 | 56.3 | 103 | 61.3 | 133 | 51.2 | 53 | 3.10 | 7 | 0 |
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| 2015 | 62.7 | 19 | 72.1 | 24 | 53.3 | 23 | 0.11 | 116 | 0 |
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| 2014 | 64.9 | 7 | 76 | 6 | 53.9 | 16 | 0.00 | 140 | 0 |
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| 2013 | 54.2 | 131 | 62.8 | 121 | 45.6 | 138 | 0.89 | 52 | 0 |
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| 2012 | 60.7 | 43 | 71.7 | 29 | 49.8 | 79 | 0.00 | 140 | 0 |
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| 2011 | 56.3 | 103 | 60.8 | 137 | 51.9 | 38 | 0.95 | 49 | 0 |
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| 2010 | 60.8 | 40 | 67.3 | 67 | 54.2 | 11 | 0.87 | 53 | 0 |
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| 2009 | 56 | 110 | 65.7 | 87 | 46.3 | 132 | 0.13 | 112 | 0 |
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| 2008 | 57.2 | 92 | 63.3 | 113 | 51.1 | 56 | 1.72 | 20 | 0 |
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| 2007 | 53.7 | 136 | 60.4 | 139 | 47 | 126 | 1.16 | 37 | 0 |
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| 2006 | | | | | | | 0.10 | 118 | 1 |
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| 2005 | | | | | | | 1.36 | 28 | 1 |
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| 2004 | 62.6 | 22 | 72 | 25 | 53.2 | 24 | 0.60 | 69 | 0 |
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| 2003 | 60.2 | 49 | 66.3 | 82 | 54 | 13 | 0.57 | 72 | 0 |
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| 2002 | 54.9 | 123 | 61.6 | 131 | 48.3 | 107 | 0.32 | 93 | 0 |
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| 2001 | 60.9 | 39 | 70.6 | 40 | 51.3 | 50 | 0.16 | 109 | 0 |
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| 2000 | 58.3 | 79 | 67.6 | 63 | 49.1 | 95 | 0.93 | 50 | 0 |
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| 1999 | 58.7 | 73 | 67.2 | 69 | 50.1 | 72 | 0.77 | 56 | 0 |
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| 1998 | 57.6 | 87 | 65 | 94 | 50.1 | 72 | 1.98 | 16 | 0 |
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| 1997 | 54.9 | 123 | 59.8 | 147 | 50 | 74 | 4.44 | 1 | 0 |
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| 1996 | 63.9 | 12 | 73.8 | 14 | 54 | 13 | 0.54 | 75 | 0 |
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| 1995 | 57.5 | 90 | 64.2 | 103 | 50.8 | 60 | 0.62 | 66 | 0 |
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| 1994 | 59.9 | 52 | 70.4 | 42 | 49.4 | 91 | 0.00 | 140 | 0 |
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| 1993 | 61.4 | 34 | 71 | 32 | 51.9 | 38 | 0.12 | 114 | 0 |
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| 1992 | 58 | 82 | 66.2 | 84 | 49.8 | 79 | 0.33 | 91 | 0 |
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| 1991 | 62.2 | 27 | 73.2 | 17 | 51.2 | 53 | 0.00 | 140 | 0 |
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| 1990 | 55.1 | 121 | 63.4 | 111 | 46.8 | 130 | 0.64 | 63 | 0 |
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| 1989 | 60.5 | 46 | 70.2 | 47 | 50.8 | 60 | 0.01 | 128 | 0 |
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| 1988 | 63.4 | 15 | 71 | 32 | 55.8 | 4 | 0.06 | 123 | 0 |
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| 1987 | 66.2 | 4 | 77.7 | 4 | 54.7 | 8 | 0.00 | 140 | 0 |
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| 1986 | 59.2 | 65 | 68.4 | 58 | 49.9 | 76 | 0.00 | 140 | 0 |
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| 1985 | 56.6 | 98 | 65.4 | 89 | 47.7 | 117 | 0.10 | 118 | 0 |
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| 1984 | | | 70.7 | 37 | | | 0.57 | 72 | 1 |
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| 1983 | 57 | 95 | 66.4 | 80 | 47.6 | 118 | 0.03 | 127 | 0 |
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| 1982 | | | 63.6 | 108 | | | 0.76 | 57 | 1 |
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| 1981 | 54.6 | 128 | 61.8 | 128 | 47.3 | 122 | 2.83 | 9 | 0 |
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| 1980 | 66.3 | 3 | 79.6 | 2 | 53 | 28 | 0.00 | 140 | 0 |
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| 1978 | 62.5 | 23 | 73.6 | 15 | 51.4 | 47 | trace | 132 | 0 |
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| 1977 | 56.1 | 109 | 64.8 | 96 | 47.3 | 122 | 1.04 | 44 | 0 |
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| 1976 | 60.7 | 43 | 69.9 | 51 | 51.4 | 47 | 0.05 | 125 | 0 |
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| 1975 | 58.6 | 75 | 65.7 | 87 | 51.6 | 44 | 1.19 | 33 | 0 |
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| 1974 | 58.1 | 80 | 70.4 | 42 | 45.7 | 137 | 0.12 | 114 | 0 |
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| 1973 | 53.1 | 141 | 62.9 | 119 | 43.2 | 145 | 0.85 | 54 | 0 |
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| 1972 | 60.2 | 49 | 70.7 | 37 | 49.7 | 82 | 0.20 | 106 | 0 |
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| 1971 | 64.2 | 11 | 75.3 | 9 | 53.1 | 26 | 0.00 | 140 | 0 |
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| 1970 | 59.6 | 56 | 69 | 55 | 50.2 | 70 | 0.09 | 121 | 0 |
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| 1969 | 56.5 | 101 | 64.8 | 96 | 48.2 | 109 | 1.96 | 17 | 0 |
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| 1968 | 56.2 | 107 | 65.2 | 91 | 47.2 | 125 | 0.68 | 60 | 0 |
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| 1967 | 59.5 | 57 | 67.4 | 65 | 51.6 | 44 | 1.91 | 18 | 0 |
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| 1966 | 61.4 | 34 | 72 | 25 | 50.8 | 60 | 0.23 | 101 | 0 |
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| 1965 | 62.3 | 25 | 72.3 | 23 | 52.3 | 33 | 0.63 | 65 | 0 |
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| 1964 | 62.7 | 19 | 71.8 | 28 | 53.6 | 18 | 0.28 | 96 | 0 |
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| 1963 | 61.2 | 36 | 70.3 | 46 | 52.1 | 36 | 0.20 | 106 | 0 |
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| 1962 | 56.6 | 98 | 63.6 | 108 | 49.6 | 88 | 2.63 | 11 | 0 |
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| 1961 | 59.3 | 60 | 69.6 | 53 | 49.1 | 95 | 0.49 | 77 | 0 |
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| 1960 | 58.1 | 80 | 67 | 74 | 49.2 | 93 | 0.90 | 51 | 0 |
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| 1959 | 57 | 95 | 64.3 | 102 | 49.7 | 82 | 1.10 | 40 | 0 |
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| 1958 | 63.1 | 17 | 72.9 | 18 | 53.2 | 24 | 0.33 | 91 | 0 |
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| 1957 | 55.3 | 118 | 60.2 | 141 | 50.4 | 66 | 1.13 | 39 | 0 |
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| 1956 | 60.1 | 51 | 69.8 | 52 | 50.4 | 66 | 0.22 | 104 | 0 |
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| 1955 | 56 | 110 | 62.6 | 122 | 49.4 | 91 | 3.94 | 3 | 0 |
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| 1954 | 58.8 | 72 | 67.1 | 71 | 50.6 | 64 | 0.39 | 87 | 0 |
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| 1953 | 61.1 | 37 | 70.4 | 42 | 51.7 | 42 | 1.45 | 24 | 0 |
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| 1952 | 68.9 | 1 | 81.8 | 1 | 56.1 | 2 | 0.00 | 140 | 0 |
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| 1951 | 62.7 | 19 | 70.6 | 40 | 54.8 | 7 | 1.99 | 15 | 0 |
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| 1950 | 54.8 | 126 | 61.6 | 131 | 48 | 112 | 3.78 | 4 | 0 |
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| 1949 | 53.3 | 139 | 60.2 | 141 | 46.3 | 132 | 2.18 | 14 | 0 |
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| 1948 | 59.4 | 58 | 67.2 | 69 | 51.6 | 44 | 1.10 | 40 | 0 |
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| 1947 | 59.3 | 60 | 65.1 | 93 | 53.4 | 20 | 1.02 | 46 | 0 |
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| 1946 | 56 | 110 | 63 | 117 | 49 | 99 | 0.49 | 77 | 0 |
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| 1945 | 63.6 | 14 | 74.1 | 13 | 53.1 | 26 | trace | 132 | 0 |
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| 1944 | 59.8 | 54 | 67.8 | 61 | 51.8 | 40 | 0.49 | 77 | 0 |
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| 1943 | 64.6 | 8 | 72.7 | 21 | 56.4 | 1 | trace | 132 | 0 |
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| 1942 | 61.8 | 30 | 71.4 | 30 | 52.2 | 35 | trace | 132 | 0 |
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| 1941 | 56.3 | 103 | 63 | 117 | 49.7 | 82 | 1.04 | 44 | 0 |
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| 1940 | 58.7 | 73 | 66.9 | 75 | 50.6 | 64 | 0.60 | 69 | 0 |
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| 1939 | 54.8 | 126 | 61 | 136 | 48.7 | 103 | 1.16 | 37 | 0 |
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| 1938 | 59.7 | 55 | 66.9 | 75 | 52.4 | 31 | 0.43 | 83 | 0 |
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| 1937 | 58.6 | 75 | 68.2 | 59 | 48.9 | 101 | 0.68 | 60 | 0 |
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| 1936 | 62.3 | 25 | 72.9 | 18 | 51.7 | 42 | 0.23 | 101 | 0 |
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| 1935 | 62.1 | 28 | 69.6 | 53 | 54.7 | 8 | 0.66 | 62 | 0 |
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| 1934 | 61 | 38 | 70.8 | 36 | 51.2 | 53 | 0.13 | 112 | 0 |
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| 1933 | 63 | 18 | 74.7 | 10 | 51.3 | 50 | 0.00 | 140 | 0 |
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| 1932 | 63.9 | 12 | 74.4 | 11 | 53.4 | 20 | trace | 132 | 0 |
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| 1931 | 55.7 | 115 | 65.2 | 91 | 46.1 | 135 | 0.64 | 63 | 0 |
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| 1930 | 57.6 | 87 | 64.1 | 104 | 51 | 57 | 1.19 | 33 | 0 |
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| 1929 | 59.3 | 60 | 67.1 | 71 | 51.4 | 47 | 0.43 | 83 | 0 |
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| 1928 | 58 | 82 | 63.9 | 106 | 52.1 | 36 | 1.27 | 32 | 0 |
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| 1927 | 54.1 | 132 | 61.3 | 133 | 46.9 | 129 | 1.38 | 26 | 0 |
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| 1926 | 59.1 | 67 | 65.9 | 86 | 52.3 | 33 | 1.49 | 23 | 0 |
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| 1925 | 59.1 | 67 | 69 | 55 | 49.1 | 95 | trace | 132 | 0 |
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| 1924 | 54.9 | 123 | 62.3 | 124 | 47.6 | 118 | 0.72 | 59 | 0 |
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| 1923 | 60.8 | 40 | 68.2 | 59 | 53.4 | 20 | 0.84 | 55 | 0 |
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| 1922 | 58.4 | 77 | 66.8 | 78 | 50 | 74 | 1.33 | 30 | 0 |
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| 1921 | 61.6 | 32 | 74.2 | 12 | 49 | 99 | 0.00 | 140 | 0 |
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| 1920 | 59.1 | 67 | 64.6 | 99 | 53.6 | 18 | 1.37 | 27 | 0 |
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| 1919 | 56.3 | 103 | 65.3 | 90 | 47.3 | 122 | 0.46 | 80 | 0 |
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| 1918 | 58.9 | 71 | 67.4 | 65 | 50.4 | 66 | 1.19 | 33 | 0 |
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| 1917 | 65.9 | 5 | 77.1 | 5 | 54.7 | 8 | 0.00 | 140 | 0 |
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| 1916 | 53.6 | 138 | 64.6 | 99 | 42.6 | 147 | 0.00 | 140 | 0 |
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| 1915 | 57.6 | 87 | 66.4 | 80 | 48.7 | 103 | 0.62 | 66 | 0 |
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| 1914 | 57.4 | 91 | 63.1 | 115 | 51.8 | 40 | 1.52 | 22 | 0 |
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| 1913 | 53.8 | 135 | 61.8 | 128 | 45.9 | 136 | 1.34 | 29 | 0 |
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| 1912 | 53.1 | 141 | 62.3 | 124 | 43.9 | 143 | 0.36 | 88 | 0 |
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| 1911 | 55.1 | 121 | 63.1 | 115 | 47 | 126 | 0.74 | 58 | 0 |
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| 1910 | 59.2 | 65 | 64.6 | 99 | 53.8 | 17 | 2.76 | 10 | 0 |
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| 1909 | 56.4 | 102 | 64.9 | 95 | 47.9 | 114 | 0.23 | 101 | 0 |
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| 1908 | 57.1 | 93 | 67.3 | 67 | 46.8 | 130 | 0.06 | 123 | 0 |
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| 1907 | 60.6 | 45 | 70.1 | 50 | 51 | 57 | 0.40 | 86 | 0 |
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| 1906 | 60.8 | 40 | 71 | 32 | 50.7 | 63 | 0.42 | 85 | 0 |
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| 1905 | 55.7 | 115 | 61.2 | 135 | 50.2 | 70 | 3.52 | 5 | 0 |
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| 1904 | 59.9 | 52 | 70.2 | 47 | 49.7 | 82 | trace | 132 | 0 |
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| 1903 | 54.4 | 130 | 60.3 | 140 | 48.6 | 105 | 1.59 | 21 | 0 |
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| 1902 | 61.6 | 32 | 72.8 | 20 | 50.4 | 66 | 0.10 | 118 | 0 |
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| 1901 | 57.9 | 85 | 66.2 | 84 | 49.6 | 88 | 0.16 | 109 | 0 |
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| 1900 | 53.2 | 140 | 62.1 | 127 | 44.2 | 142 | 0.09 | 121 | 0 |
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| 1899 | 58 | 82 | 66.3 | 82 | 49.7 | 82 | 0.26 | 99 | 0 |
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| 1898 | 52.3 | 145 | 60.8 | 137 | 43.9 | 143 | 0.53 | 76 | 0 |
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| 1897 | 58.4 | 77 | 67.1 | 71 | 49.8 | 79 | 0.01 | 128 | 0 |
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| 1896 | 57.8 | 86 | 66.9 | 75 | 48.8 | 102 | 0.11 | 116 | 0 |
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| 1895 | 59.1 | 67 | 69 | 55 | 49.1 | 95 | trace | 132 | 0 |
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| 1894 | 55.6 | 117 | 63.7 | 107 | 47.6 | 118 | 0.60 | 69 | 0 |
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| 1893 | 50.9 | 146 | 56.2 | 148 | 45.6 | 138 | 4.06 | 2 | 0 |
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| 1892 | | | | | | | 0.22 | 104 | 3 |
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| 1891 | 60.3 | 47 | 70.9 | 35 | 49.7 | 82 | 0.01 | 128 | 0 |
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| 1890 | | | | | 45 | 140 | 1.28 | 31 | 1 |
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| 1889 | 59.3 | 60 | 67.8 | 61 | 50.9 | 59 | 2.32 | 13 | 0 |
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| 1888 | 62.1 | 28 | 70.2 | 47 | 54 | 13 | 1.00 | 47 | 0 |
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| 1887 | 56.8 | 97 | 64.1 | 104 | 49.6 | 88 | 1.18 | 36 | 0 |
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| 1886 | 56.6 | 98 | 64.7 | 98 | 48.4 | 106 | 1.00 | 47 | 0 |
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| 1885 | 64.3 | 10 | 76 | 6 | 52.6 | 30 | 0.34 | 89 | 0 |
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| 1884 | 52.4 | 144 | 61.8 | 128 | 43.1 | 146 | 1.05 | 42 | 0 |
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| 1883 | 54.6 | 128 | 59.9 | 145 | 49.2 | 93 | 1.89 | 19 | 0 |
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| 1882 | 53.9 | 134 | 60 | 144 | 47.8 | 116 | 2.40 | 12 | 0 |
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| 1881 | 53.1 | 141 | 59.9 | 145 | 46.3 | 132 | 0.34 | 89 | 0 |
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| 1880 | 55.8 | 113 | 63.3 | 113 | 48.3 | 107 | 0.24 | 100 | 0 |
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| 1879 | 54 | 133 | 60.1 | 143 | 47.9 | 114 | 1.45 | 24 | 0 |
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| 1878 | 55.8 | 113 | 63.6 | 108 | 48 | 112 | 0.55 | 74 | 0 |
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| 1877 | 55.2 | 119 | 62.3 | 124 | 48.1 | 111 | 3.00 | 8 | 0 |
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| 1876 | 62.4 | 24 | 72 | 25 | 52.8 | 29 | 0.01 | 128 | 0 |
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| 1875 | 61.8 | 30 | 71.2 | 31 | 52.4 | 31 | 0.44 | 82 | 0 |
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| 1874 | 59.3 | 60 | 70.4 | 42 | 48.2 | 109 | 0.16 | 109 | 0 |
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| 1873 | | | | | | | 3.49 | 6 | 9 |
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| 1872 | | | | | | | 0.46 | 80 | 9 |
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