Records for Hillsboro Area, Oregon (HIOthr) on 05-31
Record Highs
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1: 93°F (1986)
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2: 92°F (2001)
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3: 90°F (1931)
Record Lows
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1: 32°F (1934)
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2: 35°F (1966)
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3: 35°F (1939)
Lowest Highs
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1: 60°F (1986)
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2: 59°F (2012)
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3: 56°F (1993)
Highest Lows
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1: 55°F (1971)
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2: 59°F (2000)
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3: 59°F (1976)
Highest May temperature:
100°F on 05-29-1983.
Lowest May temperature:
26°F on 05-08-1935.
Average temperature is 59°F
Average high is 70.7°F
Average low is 47.2°F
Temperature data from 1929 to 2022.
Record Precipitation
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1: 0.76" (1977)
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2: 0.63" (1967)
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3: 0.43" (1958)
Precipitation data from 1929 to 2022.