Records for Hillsboro Area, Oregon (HIOthr) on 05-18
Record Highs
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1: 90°F (1956)
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2: 89°F (1963)
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3: 87°F (1993)
Record Lows
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1: 31°F (2003)
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2: 34°F (2012)
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3: 34°F (1950)
Lowest Highs
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1: 58°F (1955)
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2: 57°F (1958)
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3: 56°F (1956)
Highest Lows
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1: 52°F (1991)
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2: 54°F (1974)
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3: 56°F (1962)
Highest May temperature:
100°F on 05-29-1983.
Lowest May temperature:
26°F on 05-08-1935.
Average temperature is 57.4°F
Average high is 69.4°F
Average low is 45.3°F
Temperature data from 1929 to 2022.
Record Precipitation
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1: 0.59" (1933)
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2: 0.55" (1991)
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3: 0.51" (2014)
Precipitation data from 1929 to 2022.