Every 1 September to 9 October in Olympia, WA from 1948 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 | 57.5 | 38 | 69.5 | 43 | 45.5 | 31 | 1.91 | 59 | 0 |
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| 2025 | 60.1 | 8 | 72.6 | 16 | 47.5 | 7 | 1.60 | 60 | 0 |
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| 2024 | 59.7 | 12 | 72.1 | 20 | 47.3 | 8 | 2.56 | 45 | 0 |
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| 2023 | 59.1 | 16 | 71.8 | 22 | 46.5 | 18 | 2.66 | 40 | 0 |
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| 2022 | 61.8 | 1 | 76.3 | 2 | 47.3 | 8 | 0.13 | 76 | 0 |
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| 2021 | 57.6 | 36 | 69.7 | 39 | 45.5 | 31 | 3.70 | 22 | 0 |
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| 2020 | 61.7 | 2 | 73.3 | 11 | 50.1 | 1 | 4.04 | 19 | 0 |
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| 2019 | 56.8 | 48 | 66.8 | 72 | 46.7 | 14 | 4.45 | 18 | 0 |
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| 2018 | 56.1 | 62 | 67.9 | 62 | 44.2 | 49 | 3.64 | 23 | 0 |
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| 2017 | 59 | 18 | 72.4 | 19 | 45.6 | 28 | 1.58 | 61 | 0 |
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| 2016 | 57.5 | 38 | 68.4 | 57 | 46.6 | 15 | 3.58 | 24 | 0 |
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| 2015 | 57.5 | 38 | 69.8 | 37 | 45.1 | 37 | 1.42 | 66 | 0 |
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| 2014 | 60.4 | 6 | 73.8 | 8 | 47 | 11 | 3.07 | 30 | 0 |
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| 2013 | 58.6 | 24 | 67.7 | 65 | 49.5 | 2 | 11.15 | 1 | 0 |
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| 2012 | 56.9 | 47 | 73.3 | 11 | 40.5 | 79 | trace | 78 | 0 |
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| 2011 | 59.3 | 14 | 71.4 | 28 | 47.2 | 10 | 2.80 | 37 | 0 |
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| 2010 | 58 | 29 | 67.2 | 67 | 48.8 | 4 | 6.96 | 6 | 0 |
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| 2009 | 57.3 | 42 | 70.6 | 33 | 44.1 | 50 | 2.60 | 43 | 0 |
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| 2008 | 57.3 | 42 | 69.4 | 45 | 45.3 | 35 | 2.30 | 49 | 0 |
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| 2007 | 56.2 | 59 | 66.2 | 76 | 46.1 | 23 | 3.99 | 20 | 0 |
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| 2006 | 58.1 | 28 | 71.9 | 21 | 44.3 | 47 | 0.84 | 70 | 0 |
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| 2005 | 55.4 | 68 | 67.9 | 62 | 42.8 | 64 | 3.16 | 29 | 0 |
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| 2004 | 56.7 | 49 | 67.1 | 68 | 46.4 | 19 | 5.58 | 9 | 0 |
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| 2003 | 59.2 | 15 | 71.6 | 23 | 46.8 | 13 | 2.15 | 53 | 0 |
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| 2002 | 56.6 | 51 | 69.7 | 39 | 43.5 | 55 | 0.85 | 69 | 0 |
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| 2001 | 56.1 | 62 | 69.1 | 50 | 43 | 62 | 0.65 | 71 | 0 |
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| 2000 | 56.3 | 55 | 69.6 | 41 | 43 | 62 | 2.78 | 38 | 0 |
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| 1999 | 55.9 | 64 | 70.9 | 30 | 40.9 | 77 | 1.55 | 62 | 0 |
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| 1998 | 59 | 18 | 73.4 | 10 | 44.6 | 43 | 1.54 | 63 | 0 |
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| 1997 | 58.7 | 23 | 69.2 | 47 | 48.2 | 5 | 8.02 | 3 | 0 |
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| 1996 | 56.3 | 55 | 68.2 | 58 | 44.5 | 45 | 3.01 | 32 | 0 |
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| 1995 | 60.4 | 6 | 73.1 | 14 | 47.7 | 6 | 2.64 | 41 | 0 |
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| 1994 | 60 | 9 | 74.5 | 6 | 45.5 | 31 | 1.54 | 63 | 0 |
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| 1993 | 58.8 | 21 | 75.1 | 4 | 42.6 | 67 | 0.08 | 77 | 0 |
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| 1992 | 57.1 | 45 | 70.8 | 32 | 43.4 | 58 | 2.54 | 46 | 0 |
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| 1991 | 58.2 | 26 | 73.1 | 14 | 43.3 | 59 | trace | 78 | 0 |
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| 1990 | 58.8 | 21 | 71.5 | 26 | 46.1 | 23 | 1.11 | 68 | 0 |
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| 1989 | 57.9 | 31 | 73.5 | 9 | 42.3 | 72 | 0.50 | 73 | 0 |
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| 1988 | 57.4 | 41 | 69.8 | 37 | 45.1 | 37 | 2.01 | 55 | 0 |
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| 1987 | 59.9 | 11 | 75.2 | 3 | 44.6 | 43 | 0.29 | 75 | 0 |
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| 1986 | 56.4 | 54 | 67.3 | 66 | 45.4 | 34 | 3.38 | 27 | 0 |
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| 1985 | 54.9 | 74 | 66.9 | 70 | 42.8 | 64 | 2.95 | 35 | 0 |
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| 1984 | 58 | 29 | 70.3 | 34 | 45.6 | 28 | 2.60 | 43 | 0 |
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| 1983 | 54.9 | 74 | 67.8 | 64 | 41.9 | 75 | 1.94 | 58 | 0 |
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| 1982 | 57.6 | 36 | 70.3 | 34 | 44.8 | 40 | 3.00 | 33 | 0 |
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| 1981 | 58.2 | 26 | 71.6 | 23 | 44.7 | 41 | 8.54 | 2 | 0 |
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| 1980 | 59.6 | 13 | 72.5 | 18 | 46.6 | 15 | 2.21 | 50 | 0 |
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| 1979 | 58.3 | 25 | 71.5 | 26 | 45.1 | 37 | 2.72 | 39 | 0 |
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| 1978 | 56.3 | 55 | 66.3 | 75 | 46.2 | 22 | 7.66 | 4 | 0 |
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| 1977 | 54.8 | 76 | 66.2 | 76 | 43.5 | 55 | 4.76 | 14 | 0 |
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| 1976 | 57.8 | 32 | 69.5 | 43 | 46.1 | 23 | 1.48 | 65 | 0 |
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| 1975 | 56.7 | 49 | 70.9 | 30 | 42.6 | 67 | 2.52 | 47 | 0 |
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| 1974 | 60.9 | 4 | 77.2 | 1 | 44.7 | 41 | 0.55 | 72 | 0 |
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| 1973 | 56.2 | 59 | 69.2 | 47 | 43.2 | 60 | 3.85 | 21 | 0 |
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| 1972 | 54.1 | 79 | 67.1 | 68 | 41 | 76 | 5.13 | 11 | 0 |
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| 1971 | 55.8 | 65 | 69.1 | 50 | 42.4 | 71 | 3.06 | 31 | 0 |
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| 1970 | 54.4 | 78 | 66.2 | 76 | 42.5 | 69 | 3.40 | 26 | 0 |
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| 1969 | 57.2 | 44 | 68.6 | 55 | 45.7 | 27 | 7.42 | 5 | 0 |
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| 1968 | 55.6 | 66 | 66.9 | 70 | 44.3 | 47 | 3.52 | 25 | 0 |
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| 1967 | 60.7 | 5 | 74.7 | 5 | 46.6 | 15 | 4.49 | 17 | 0 |
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| 1966 | 57.8 | 32 | 70.3 | 34 | 45.3 | 35 | 2.05 | 54 | 0 |
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| 1965 | 55 | 73 | 68 | 61 | 42 | 74 | 2.16 | 52 | 0 |
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| 1964 | 55.3 | 71 | 68.1 | 59 | 42.5 | 69 | 2.97 | 34 | 0 |
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| 1963 | 61 | 3 | 72.6 | 16 | 49.4 | 3 | 2.64 | 41 | 0 |
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| 1962 | 56.5 | 52 | 68.9 | 52 | 44 | 52 | 6.54 | 7 | 0 |
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| 1961 | 54.8 | 76 | 68.9 | 52 | 40.7 | 78 | 1.16 | 67 | 0 |
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| 1960 | 55.4 | 68 | 68.5 | 56 | 42.3 | 72 | 1.98 | 56 | 0 |
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| 1959 | 55.5 | 67 | 65.4 | 79 | 45.6 | 28 | 4.63 | 15 | 0 |
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| 1958 | 57.7 | 34 | 69.4 | 45 | 45.9 | 26 | 2.81 | 36 | 0 |
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| 1957 | 60 | 9 | 73.2 | 13 | 46.9 | 12 | 1.95 | 57 | 0 |
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| 1956 | 56.3 | 55 | 68.7 | 54 | 43.8 | 53 | 2.36 | 48 | 0 |
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| 1955 | 55.1 | 72 | 66.7 | 73 | 43.5 | 55 | 4.89 | 12 | 0 |
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| 1954 | 56.5 | 52 | 66.6 | 74 | 46.4 | 19 | 2.18 | 51 | 0 |
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| 1953 | 57.7 | 34 | 71.3 | 29 | 44.1 | 50 | 4.83 | 13 | 0 |
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| 1952 | 59.1 | 16 | 74.5 | 6 | 43.6 | 54 | 0.43 | 74 | 0 |
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| 1951 | 59 | 18 | 71.6 | 23 | 46.4 | 19 | 4.50 | 16 | 0 |
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| 1950 | 56.2 | 59 | 69.2 | 47 | 43.2 | 60 | 5.16 | 10 | 0 |
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| 1949 | 57 | 46 | 69.6 | 41 | 44.4 | 46 | 3.18 | 28 | 0 |
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| 1948 | 55.4 | 68 | 68.1 | 59 | 42.8 | 64 | 6.00 | 8 | 0 |
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