Every 1 to 9 October in Portland, OR from 1941 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 | 64.7 | 4 | 76.9 | 7 | 52.6 | 11 | 0.07 | 65 | 0 |
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| 2025 | 59.5 | 29 | 68.1 | 44 | 50.9 | 18 | 0.22 | 54 | 0 |
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| 2024 | 61.9 | 16 | 73.6 | 16 | 50.3 | 23 | 0.31 | 48 | 0 |
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| 2023 | 64 | 9 | 74.4 | 10 | 53.6 | 5 | 0.37 | 46 | 0 |
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| 2022 | 68.1 | 1 | 81.2 | 1 | 54.9 | 2 | trace | 71 | 0 |
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| 2021 | 56 | 63 | 65.1 | 62 | 46.9 | 53 | 0.50 | 40 | 0 |
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| 2020 | 65.1 | 2 | 74.8 | 9 | 55.4 | 1 | 0.05 | 69 | 0 |
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| 2019 | 53.2 | 82 | 63.4 | 72 | 42.9 | 83 | 0.18 | 56 | 0 |
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| 2018 | 56.7 | 57 | 64 | 68 | 49.3 | 30 | 0.84 | 22 | 0 |
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| 2017 | 56.7 | 57 | 68.3 | 41 | 45.1 | 72 | 0.06 | 67 | 0 |
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| 2016 | 57.9 | 46 | 63 | 75 | 52.8 | 10 | 2.10 | 5 | 0 |
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| 2015 | 63.1 | 11 | 73.9 | 14 | 52.2 | 12 | 0.09 | 63 | 0 |
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| 2014 | 64.7 | 4 | 77.9 | 5 | 51.4 | 16 | trace | 71 | 0 |
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| 2013 | 53.6 | 81 | 62.9 | 76 | 44.2 | 79 | 0.84 | 22 | 0 |
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| 2012 | 59.1 | 32 | 73.7 | 15 | 44.6 | 77 | 0.00 | 79 | 0 |
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| 2011 | 57.5 | 52 | 62 | 78 | 53 | 8 | 0.71 | 32 | 0 |
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| 2010 | 60.7 | 21 | 68 | 45 | 53.4 | 6 | 0.55 | 38 | 0 |
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| 2009 | 55.6 | 67 | 66.1 | 57 | 45.1 | 72 | 0.10 | 61 | 0 |
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| 2008 | 57.6 | 50 | 64.4 | 64 | 50.7 | 22 | 1.46 | 12 | 0 |
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| 2007 | 54.5 | 77 | 60.7 | 84 | 48.3 | 42 | 1.06 | 18 | 0 |
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| 2006 | 57.4 | 53 | 66 | 58 | 48.8 | 38 | 0.06 | 67 | 0 |
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| 2005 | 55.6 | 67 | 62 | 78 | 49.2 | 33 | 0.72 | 31 | 0 |
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| 2004 | 61.6 | 17 | 72.3 | 22 | 50.8 | 21 | 1.33 | 15 | 0 |
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| 2003 | 60.2 | 23 | 66.6 | 50 | 53.9 | 3 | 1.56 | 11 | 0 |
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| 2002 | 56.5 | 60 | 63.4 | 72 | 49.6 | 29 | 0.57 | 36 | 0 |
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| 2001 | 59.4 | 30 | 70.7 | 29 | 48.1 | 46 | 0.15 | 59 | 0 |
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| 2000 | 58.1 | 40 | 68.2 | 43 | 47.9 | 47 | 0.84 | 22 | 0 |
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| 1999 | 58.1 | 40 | 68.3 | 41 | 47.9 | 47 | 0.94 | 20 | 0 |
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| 1998 | 57.7 | 48 | 65.3 | 61 | 50 | 24 | 1.18 | 17 | 0 |
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| 1997 | 55.3 | 70 | 60.8 | 83 | 49.8 | 27 | 3.37 | 2 | 0 |
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| 1996 | 63.6 | 10 | 74.1 | 13 | 53.1 | 7 | 0.48 | 42 | 0 |
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| 1995 | 58 | 43 | 66.3 | 54 | 49.7 | 28 | 0.47 | 43 | 0 |
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| 1994 | 59.7 | 28 | 73 | 19 | 46.3 | 59 | 0.00 | 79 | 0 |
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| 1993 | 61.2 | 19 | 73.1 | 18 | 49.3 | 30 | 0.16 | 58 | 0 |
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| 1992 | 56.8 | 56 | 66.8 | 48 | 46.9 | 53 | 0.45 | 44 | 0 |
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| 1991 | 61.6 | 17 | 75.4 | 8 | 47.7 | 50 | 0.00 | 79 | 0 |
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| 1990 | 55.5 | 69 | 65.7 | 59 | 45.3 | 70 | 0.66 | 34 | 0 |
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| 1989 | 60 | 26 | 70.8 | 28 | 49.2 | 33 | trace | 71 | 0 |
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| 1988 | 63.1 | 11 | 72.4 | 21 | 53.7 | 4 | 0.03 | 70 | 0 |
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| 1987 | 65 | 3 | 79.1 | 4 | 50.9 | 18 | 0.00 | 79 | 0 |
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| 1986 | 59.4 | 30 | 69.9 | 33 | 48.9 | 37 | 0.00 | 79 | 0 |
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| 1985 | 54.7 | 76 | 66.3 | 54 | 43.1 | 82 | 0.10 | 61 | 0 |
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| 1984 | 62.8 | 13 | 72.7 | 20 | 53 | 8 | 0.56 | 37 | 0 |
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| 1983 | 56.3 | 61 | 66.4 | 52 | 46.2 | 62 | 0.07 | 65 | 0 |
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| 1982 | 55.3 | 70 | 64.3 | 65 | 46.3 | 59 | 0.74 | 29 | 0 |
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| 1981 | 55.2 | 73 | 61.7 | 80 | 48.7 | 39 | 2.48 | 4 | 0 |
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| 1980 | 64.6 | 7 | 80.8 | 2 | 48.4 | 41 | 0.00 | 79 | 0 |
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| 1979 | 64.7 | 4 | 77.2 | 6 | 52.2 | 12 | trace | 71 | 0 |
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| 1978 | 59.8 | 27 | 73.3 | 17 | 46.3 | 59 | trace | 71 | 0 |
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| 1977 | 54.4 | 78 | 64.3 | 65 | 44.4 | 78 | 0.65 | 35 | 0 |
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| 1976 | 58.8 | 34 | 69.4 | 35 | 48.2 | 43 | 0.09 | 63 | 0 |
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| 1975 | 58.6 | 36 | 66.2 | 56 | 50.9 | 18 | 1.06 | 18 | 0 |
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| 1974 | 56.1 | 62 | 70.4 | 31 | 41.8 | 84 | 0.18 | 56 | 0 |
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| 1973 | 52.4 | 85 | 63.1 | 74 | 41.7 | 86 | 0.89 | 21 | 0 |
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| 1972 | 57.7 | 48 | 71.6 | 26 | 43.9 | 80 | 0.14 | 60 | 0 |
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| 1971 | 62.1 | 14 | 74.2 | 11 | 49.9 | 25 | 0.00 | 79 | 0 |
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| 1970 | 57.6 | 50 | 69.1 | 37 | 46 | 68 | 0.25 | 52 | 0 |
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| 1969 | 55.7 | 65 | 65.1 | 62 | 46.2 | 62 | 1.38 | 14 | 0 |
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| 1968 | 52.7 | 84 | 63.6 | 71 | 41.8 | 84 | 0.79 | 27 | 0 |
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| 1967 | 58.1 | 40 | 66.9 | 47 | 49.2 | 33 | 1.42 | 13 | 0 |
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| 1966 | 58.7 | 35 | 70.6 | 30 | 46.9 | 53 | 0.31 | 48 | 0 |
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| 1965 | 60.8 | 20 | 72.3 | 22 | 49.3 | 30 | 0.49 | 41 | 0 |
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| 1964 | 57.9 | 46 | 70 | 32 | 45.9 | 69 | 0.23 | 53 | 0 |
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| 1963 | 58.6 | 36 | 68.9 | 40 | 48.2 | 43 | 0.34 | 47 | 0 |
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| 1962 | 55.9 | 64 | 64.1 | 67 | 47.8 | 49 | 1.97 | 6 | 0 |
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| 1961 | 56.9 | 55 | 69.1 | 37 | 44.7 | 75 | 0.41 | 45 | 0 |
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| 1960 | 55.7 | 65 | 66.7 | 49 | 44.7 | 75 | 0.81 | 26 | 0 |
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| 1959 | 55.1 | 75 | 63.7 | 70 | 46.4 | 57 | 0.73 | 30 | 0 |
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| 1958 | 58.9 | 33 | 71.7 | 25 | 46.1 | 67 | 0.26 | 51 | 0 |
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| 1957 | 53.8 | 79 | 60 | 85 | 47.7 | 50 | 1.61 | 9 | 0 |
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| 1956 | 57 | 54 | 69 | 39 | 45 | 74 | 0.19 | 55 | 0 |
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| 1955 | 53.8 | 79 | 61.3 | 81 | 46.2 | 62 | 3.62 | 1 | 0 |
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| 1954 | 56.6 | 59 | 66.6 | 50 | 46.6 | 56 | 0.29 | 50 | 0 |
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| 1953 | 58 | 43 | 69.8 | 34 | 46.2 | 62 | 1.59 | 10 | 0 |
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| 1952 | 64.2 | 8 | 80.8 | 2 | 47.6 | 52 | trace | 71 | 0 |
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| 1951 | 60.3 | 22 | 69.4 | 35 | 51.1 | 17 | 1.75 | 7 | 0 |
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| 1950 | 53.2 | 82 | 61 | 82 | 45.3 | 70 | 2.94 | 3 | 0 |
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| 1949 | 51.2 | 86 | 59.1 | 86 | 43.3 | 81 | 1.67 | 8 | 0 |
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| 1948 | 58.2 | 39 | 66.4 | 52 | 49.9 | 25 | 1.24 | 16 | 0 |
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| 1947 | 58.6 | 36 | 65.4 | 60 | 51.7 | 14 | 0.77 | 28 | 0 |
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| 1946 | 55.2 | 73 | 64 | 68 | 46.4 | 57 | 0.69 | 33 | 0 |
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| 1945 | 60.2 | 23 | 74.2 | 11 | 46.2 | 62 | 0.00 | 79 | 0 |
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| 1944 | 58 | 43 | 67.4 | 46 | 48.6 | 40 | 0.55 | 38 | 0 |
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| 1943 | 62 | 15 | 72.3 | 22 | 51.7 | 14 | trace | 71 | 0 |
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| 1942 | 60.2 | 23 | 71.4 | 27 | 49 | 36 | trace | 71 | 0 |
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| 1941 | 55.3 | 70 | 62.3 | 77 | 48.2 | 43 | 0.83 | 25 | 0 |
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