Records for Portland Area, Maine (PWMthr) on 05-18
Record Highs
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1: 93°F (2017)
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2: 82°F (1949)
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3: 81°F (1998)
Record Lows
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1: 31°F (1981)
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2: 31°F (1959)
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3: 32°F (1951)
Lowest Highs
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1: 61°F (1943)
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2: 59°F (2017)
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3: 52°F (1970)
Highest Lows
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1: 44°F (2007)
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2: 48°F (1973)
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3: 48°F (1946)
Highest May temperature:
94°F on 05-31-1987.
Lowest May temperature:
23°F on 05-09-1956.
Average temperature is 55.5°F
Average high is 64.7°F
Average low is 46.2°F
Temperature data from 1874 to 2022.
Record Precipitation
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1: 1.44" (1945)
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2: 1.22" (1963)
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3: 1.19" (1922)
Precipitation data from 1871 to 2022.